348: Steering Angle Sensor Challenges
About this episode
Two recent case studies dig into steering angle sensor relearns that wouldn’t complete—or wouldn’t “center” correctly. A 2008 VW GTI lost steering angle initialization after a battery disconnect, and the fix turned out to be rust-disturbed rear wheel speed tone rings that prevented the drive portion from finishing (even without ABS codes). A 2021 GMC Terrain had a 50-degree steering wheel offset after a subframe/rack-related job; the relearn only “passed” when offset, and the root cause was an intermediate steering shaft that had separated and reindexed one notch off.
This week on the show I share 2 case studies from the last week. Both are steering angle sensor relearns that won't complete, or won't correct the issue. First is a 2008 Volkswagen GTI that had the battery disconnected and won't learn the steering angle basic setting afterwards. The second is a 2021 GMC Terrain that has an off center steering wheel no matter what relearn or alignment procedures are performed.
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steering angle sensors
"...this is steering angle sensors or the centering of the steering wheel. In order to perform the steering angle sensor, reset or relearn."
A steering angle sensor tells the car how much (and which way) you’re turning the steering wheel. If it’s wrong, the car may think you’re turning when you aren’t—or not turning when you are—so warning lights or stability control issues can happen.
A steering angle sensor measures the position and rotation of the steering wheel. The car uses that data to help with stability control, traction control, and other driver-assist functions, so incorrect readings can trigger faults or cause those systems to behave oddly.
reset or relearn
"In order to perform the steering angle sensor, reset or relearn. Both of them ended up being interesting reasons why they would not complete or they would not complete correctly,"
Resetting or relearning is like teaching the car where “straight ahead” is again. After certain repairs or power interruptions, the sensor can lose its reference point, so the car needs a calibration routine to get accurate readings.
“Reset” or “relearn” procedures recalibrate the steering angle sensor so it matches the vehicle’s current steering wheel and alignment state. Many modern cars require this after repairs, battery disconnects, sensor replacement, or when the steering wheel isn’t centered, otherwise the sensor may report an offset.
2008 Volkswagen GTI
"First one is a 2008 Volkswagen GTI, and the second one is a 2021 GMC Terrain. We'll do the Volkswagen first... So again, 2008 Volkswagen GTI, it came into the shop for something completely unrelated."
They’re using a 2008 Volkswagen GTI to show what happens when the steering-angle sensor loses its calibration. If the battery is disconnected, the car may need to relearn how the steering wheel position relates to the wheels.
The hosts use a 2008 Volkswagen GTI as a real-world example of steering-angle sensor relearn trouble. On many VW models, disconnecting the battery can wipe the steering-angle sensor’s stored calibration, so the car needs a proper reset/learn procedure afterward.
Volkswagen Gti
"...talking about it on the show. First one is a 2008 Volkswagen GTI, and the second one is a 2021 GMC Terrain. We'll..."
The Volkswagen Golf is a small car that’s made for everyday driving, usually as a hatchback. The GTI version is a sportier version of the same basic car. The podcast mentions an older 2008 GTI, likely because older cars can start having more repair and warning-light problems.
The Volkswagen Golf is a compact hatchback platform that’s been produced for decades, with the GTI variant being one of the most recognizable performance-focused versions. In the podcast context, the 2008 Golf GTI is discussed as an example of a common, older European compact that can show up with diagnostic issues as it ages. It’s a useful car to talk about because many systems—engine, cooling, and electronics—can develop faults over time.
2021 GMC Terrain
"First one is a 2008 Volkswagen GTI, and the second one is a 2021 GMC Terrain. We'll do the Volkswagen first..."
They also mention a 2021 GMC Terrain as another example. The point is that steering-angle sensor problems and reset steps aren’t identical across every car.
The episode sets up a second case study: a 2021 GMC Terrain. This matters because steering-angle sensor issues and relearn procedures can vary a lot by manufacturer and model year, so the hosts are comparing how different vehicles behave.
battery disconnect losing calibration memory
"...they will lose the memory for the steering angle position sensor when you disconnect the battery or you lose battery voltage."
The segment explains that disconnecting the battery (or losing battery voltage) can cause certain European vehicles to lose stored calibration for the steering-angle sensor. That’s why a shop can accidentally create a new diagnostic problem when doing unrelated work that requires battery disconnection.
steering angle position sensor
"...they will lose the memory for the steering angle position sensor when you disconnect the battery or you lose battery voltage."
This sensor measures how much you’ve turned the steering wheel. If the battery is disconnected, the car can forget the calibration and may need to relearn it so driving safety systems work correctly.
The steering angle position sensor tells the car’s stability/steering-related systems the exact steering wheel angle. When the battery is disconnected or voltage drops, some vehicles lose the sensor’s stored calibration and require a relearn to restore correct readings.
angle reset
"...normally you would just do that angle reset after the battery is connected and you're done with whatever you're doing, and then you move on..."
An angle reset is the step where the mechanic tells the car to re-learn the steering sensor. It usually involves reconnecting the battery and then following the car’s instructions for turning the wheel.
An “angle reset” is the service procedure that reinitializes the steering-angle sensor calibration after the battery is reconnected. It’s typically performed with the correct diagnostic software and a specific steering-wheel movement routine.
relearn process
"They even tried a new steering angle sensor on this one and was not able to get it to pass the relearn process..."
The relearn process is the diagnostic workflow used to get the vehicle’s modules to accept the steering-angle sensor calibration. In this case, even replacing the steering angle sensor didn’t allow the car to pass the relearn, suggesting the issue was procedural/diagnostic rather than purely parts-related.
aftermarket scan tool
"...it wasn't just like a block of an aftermarket scan tool, which you can run into with Volkswagen and Audi stuff. He knew how to do the actual learn..."
An aftermarket scan tool is a generic device for reading codes. The point here is that some resets require the right guided procedure, not just a basic tool that can communicate with the car.
The hosts contrast the tech’s knowledge and correct procedure with the limitations of some generic aftermarket scan tools. For certain VW/Audi steering-angle relearns, you may need the right software and the correct guided steps rather than just reading/clearing codes.
steering angle learn
"...there is some confusion on this particular GTI model when you go to do the steering angle learn... there is a couple of different learns... there's a steering angle sensor learn or basic setting..."
The steering angle learn is a guided reset procedure. You turn the wheel a certain way and then drive briefly so the car can confirm the sensor calibration.
On the 2008 Volkswagen GTI, the steering-angle “learn” is a specific calibration routine that requires turning the wheel back and forth and then performing a short test drive. The hosts emphasize that this is the first learn you must do before the next step.
modules
"...you can run the learn or at least attempt to run the learn in a couple of different modules, and in fact, there is a couple of different learns."
“Modules” are the car’s computers that control different systems. The steering sensor reset may need to be run in the right computer(s) in the right order.
The hosts mention that the steering-angle learning can be run in different modules, meaning multiple control units may be involved in the calibration process. This is why the correct procedure and sequence matters—one module’s learn may depend on another being completed first.
basic setting
"...there's a steering angle sensor learn or basic setting, they call it, where you are going to turn the wheel back and forth and then take it on a short test drive..."
Basic setting is the first part of the steering sensor reset. It involves turning the wheel and then doing a short drive so the car can learn the correct relationship.
“Basic setting” refers to the initial calibration routine for the steering-angle sensor. The hosts describe it as the step where you turn the wheel back and forth and then complete a short test drive, and they stress it must be done first.
ABS module
"If you're using an aftermarket scan tool, it is important that you need to run this sensor learn through the ABS module. Okay, and then again, it's going to have you do the basic setting of that steering angle sensor..."
The ABS module is the computer that controls anti-lock braking. On this GTI setup, it also plays a role in getting the steering angle sensor to “learn,” so you have to run the procedure through the ABS system.
The ABS module is the controller that manages anti-lock braking behavior, but it can also be involved in steering angle sensor initialization on certain vehicles. Here, the host emphasizes that the steering angle “learn” must be run through the ABS module (not only through power steering) for the initialization to take effect.
Otis
"If you're using Otis, it kind of guides you there, you don't need to know that. If you're using an aftermarket scan tool, it is important that you need to run this sensor learn through the ABS module."
“Otis” is referenced as a factory diagnostic tool used to guide technicians through module-specific initialization procedures. The host contrasts it with aftermarket scan tools, emphasizing that the correct module path matters for the steering angle learn.
sensor learn
"If you're using an aftermarket scan tool, it is important that you need to run this sensor learn through the ABS module... where you crank the wheel back and forth, and then you take it on a short test drive."
A “sensor learn” is a diagnostic procedure where the vehicle’s modules calibrate a sensor after service, replacement, or certain fault conditions. In this case, the steering angle sensor learn must be performed through the correct module (ABS) so the data stream updates properly.
electric power steering
"Now, as I mentioned, there is another relearn to do in the electric power steering, which is the end stop learn."
Electric power steering uses a motor to help you turn the wheel. Since it’s computer-controlled, it may need calibration steps so it understands the steering position and limits.
Electric power steering uses an electric motor to assist steering rather than a hydraulic system. Because it has its own control module and calibration routines, procedures like steering angle initialization and “end stop learn” are often required to ensure the system knows the steering limits.
end stop learn
"Now, as I mentioned, there is another relearn to do in the electric power steering, which is the end stop learn. Now, this can only be completed once the steering wheel angle initialization has been done."
“End stop learn” is an additional calibration step for electric power steering that teaches the system the steering limits (end stops). The host notes it can only complete after steering wheel angle initialization, and attempting both in the wrong order can prevent completion.
drive test portion of the relearn
"Now, after attempting it multiple different times... what I ended up realizing was that it is not completing on the drive test portion of the relearn."
Some relearn procedures require a specific “drive test” segment to complete, during which the control module verifies sensor behavior under real driving conditions. Here, the host realizes the end stop learn wasn’t completing because it wasn’t finishing on the drive-test portion of the routine.
CAN bus
"there is a data pit that indicates the CAN bus signal of the steering angle position sensor... So it is a message that's sent over a bus. So I tried doing some coding or checking the coding of all three of these modules..."
CAN bus is the car’s internal communication network. It’s how different computers in the car share sensor data—like steering angle—so other systems can work correctly.
CAN bus is the controller-area network that lets different modules in the car exchange messages. Here, the steering column control module sends the steering-angle position data over CAN, and modules like ABS and the power steering control module use that information.
clock spring
"they tried another steering angle sensor, which by the way is up on the column behind the clock spring, and it's connected to the top of the steering control module..."
The clock spring is a coiled wiring part inside the steering column that lets wires stay connected while you turn the wheel. If the steering angle sensor is mounted behind it, repairs may require careful disassembly.
A clock spring (spiral cable) is an airbag/steering-wheel wiring component that maintains electrical connections while the steering wheel turns. The transcript places the steering angle sensor behind the clock spring, which is a common packaging location on many modern cars.
steering column control module
"it's connected to the top of the steering control module or steering column control module. And this steering column control module takes the data from the sensor, puts it out out onto the CAN bus, and then other modules just receive it, such as the ABS module and the power steering control module."
This is the computer in the steering column that reads the steering sensor. It then shares that steering information with other car systems through the car’s network.
The steering column control module reads the steering angle sensor and then broadcasts that information onto the CAN bus for other systems to use. If initialization fails even after replacing the sensor, the module’s configuration/coding or communication can be a suspect.
power steering control module
"and then other modules just receive it, such as the ABS module and the power steering control module. So it is a message that's sent over a bus."
This is the computer that manages power steering assist. If it can’t get correct steering angle data from the network, steering feel or related warnings can be affected.
The power steering control module uses steering-related inputs (like steering angle) to control assist and stability behavior. Because it relies on CAN messages, a steering sensor that isn’t initialized can affect how the power steering system behaves.
wheel speed sensors
"that would not complete was that a lot of people were having issues with the wheel speed sensors. And particularly the problem was rust buildup on the tone wheel of these wheel speed sensors"
Wheel speed sensors tell the car how fast each wheel is spinning. If one sensor is wrong or not reading, the car can think there’s a traction/ABS problem and may not complete other sensor setups.
Wheel speed sensors measure how fast each wheel is rotating and feed that information to ABS, traction control, and stability systems. If one sensor is inaccurate or intermittently fails, the car can detect mismatched wheel speeds and block certain calibration/drive procedures.
tone wheel
"particularly the problem was rust buildup on the tone wheel of these wheel speed sensors or just a failed sensor in general."
The tone wheel is a ring with a pattern that the sensor reads to figure out wheel speed. If rust builds up on it, the sensor can get a messy signal and the car may think the wheel speed is wrong.
A tone wheel (also called a reluctor ring) is the patterned metal ring near the wheel speed sensor that creates the signal pulses. Rust or damage on the tone wheel can distort the pulse pattern, causing extra pulses, dropouts, or incorrect speed readings.
driving portion of this from completing
"And so the wheel speed is different than the rest. And any of those situations would prevent the driving portion of this from completing. So you needed all four wheel speed sensors to be reading correctly"
Some car calibrations require a short drive to finish. If the car doesn’t trust the wheel speed readings (like if one wheel speed is off), it won’t complete the setup and may reset the process when you turn the key off.
Many modern vehicle calibrations include a “driving” or “road test” phase where the car verifies sensor inputs under specific conditions. If wheel speed sensor readings aren’t consistent on all wheels, the ECU may refuse to complete the procedure and stop the process when the key is cycled.
rust buildup causing sensor signal interference
"I found a couple posts out there that were actually showing the scope captures from the wheel speed sensors in this particular situation. And I saw one that you can see the extra pulses or the interference from rust buildup on the tone wheels"
Rust can mess up the signal the sensor reads from the wheel. Instead of clean pulses, the sensor may see extra or distorted pulses, which can trigger fault codes.
Rust on the tone wheel can change the magnetic/reluctance signal and create extra pulses or interference in the waveform. This can make the scan tool show wheel-speed codes even when the sensor seems “mostly” functional.
scope captures
"I found a couple posts out there that were actually showing the scope captures from the wheel speed sensors in this particular situation."
A scope is like a high-speed graph of the sensor’s electrical signal. Looking at it can show problems like extra or distorted pulses that a basic code reader might miss.
Scope captures refer to oscilloscope waveforms used to inspect the raw sensor signal. In wheel speed sensor diagnostics, an oscilloscope can reveal extra pulses, interference, or dropouts that may not be obvious from scan tool data alone.
wheel hubs
"particularly the rear wheel hubs seems to be the ones that suffer from this the most. I'm sure you're familiar with the type of wheel bearing that has a round magnetic strip on it."
The hub is part of the wheel assembly, and it can include the ring that the speed sensor reads. If that ring rusts—especially on the rear—it can cause wheel-speed readings to go wrong.
Wheel hubs often incorporate the tone wheel/reluctor ring used by the wheel speed sensor. If the hub’s tone wheel area rusts (commonly on the rear hubs, per the discussion), it can lead to wheel speed sensor errors and calibration/drive procedure failures.
magneto resistive style sensor
"And that rotates past the sensor and generates the pulses. It's a magneto resistive style sensor that outputs a digital just on off slight change in voltage."
This is a type of wheel speed sensor that reads the tone wheel using magnetic effects. As the ring passes by, it turns that into an electrical signal the car can count to know wheel speed.
A magneto-resistive (MR) wheel speed sensor uses changes in magnetic resistance to detect the passing tone wheel pattern. These sensors typically output a digital-like signal that the ECU interprets as pulses for speed calculations.
ABS light
"didn't have any ABS light on, didn't have any codes, again, the data pairs looked okay."
The ABS light is the car’s warning that something is wrong with the anti-lock braking system. But sometimes a wheel speed issue can still cause problems for other systems even if the ABS light never comes on.
The ABS light indicates a fault in the anti-lock braking system, which is closely tied to wheel speed sensing. However, wheel speed sensor problems can sometimes affect other calibrations or processes without triggering an ABS warning or storing a code.
hub, the bearing
"So they got to replace the hub, the bearing, and then probably the sensor on that one as well."
The hub and bearing are the parts that let the wheel spin smoothly. If rust has damaged the tone wheel or worn the sensor area, replacing the hub/bearing (and possibly the sensor) can fix the signal problem.
The wheel hub and bearing assembly supports the wheel and typically houses or interfaces with the tone wheel and sensor mounting area. Rust-heavy tone wheels or worn sensor tips can be addressed by replacing the hub/bearing assembly, and sometimes the sensor itself, to restore correct pulse generation.
used control module programming
"Have you ever been faced with the challenge of sourcing, installing and programming a used control module in a vehicle?... Tommy offers a cloning service for use control modules to make these things plug and play for the vehicle... used control module programming."
When you replace a car computer (control module) with a used one, it usually can’t just be plugged in. It often needs to be programmed so it matches that specific car and its security settings.
Used control module programming is the process of making a previously owned module work correctly in a different vehicle. Because modern cars use VIN-based security and configuration data, a used module often must be cloned or programmed so it becomes “plug and play” for the specific car.
SJ auto solutions
"So what do you do here? I strongly recommend checking out SJ auto solutions and Tommy Oliva."
The host is recommending a company that helps with programming used car computers. They’re described as offering support so the replacement part works correctly.
SJ auto solutions is referenced as a provider of services related to used control module cloning/programming. The host claims they help make used modules work reliably by providing support and resources for programming.
Tommy Oliva
"I strongly recommend checking out SJ auto solutions and Tommy Oliva. Tommy offers a cloning service for use control modules to make these things plug and play for the vehicle..."
Tommy is described as doing a service that helps used car computers work in the right vehicle. The idea is to avoid compatibility/security issues after installation.
Tommy Oliva is mentioned as offering a cloning service for used control modules. In this context, cloning is used to match the module to the vehicle so installation can be more straightforward.
Chevrolet Malibu
"I had a case study a few months ago on a Chevy Malibu that we were trying to do an all keys lost. And prior to the all keys lost, the car ran, it was fine, the keys worked."
The host uses a Chevrolet Malibu example where the car needed an “all keys lost” procedure, but a hidden connector problem stopped the fix from working. The customer didn’t realize it because the key still worked in normal use.
The Chevrolet Malibu is used as a case study for an “all keys lost” scenario. The host explains that a preexisting connector issue prevented the backup transmitter from working, even though the key seemed to function normally day-to-day.
all keys lost
"...trying to do an all keys lost. And prior to the all keys lost, the car ran, it was fine, the keys worked."
“All keys lost” is what you do when the car can’t find any working keys. The car’s security system has to be re-learned, and if there’s a wiring or connector problem, the process can fail.
“All keys lost” is a security procedure used when the vehicle has no recognized keys available for programming. It typically requires special steps (often involving the immobilizer/BCM/ECU security system), and any wiring/connector faults can prevent the programming from completing.
backup transmitter
"...because of something pops build on a connector, the backup transmitter wouldn't work. And now it wasn't going to work for the customer..."
The backup transmitter is like a secondary way the car can recognize the key. In this story, it didn’t work because of a connector problem, and that only mattered during the key programming process.
A backup transmitter refers to an alternate key/remote function used when the primary key signal isn’t available or isn’t being used. In the transcript, the backup transmitter couldn’t work due to an issue at a connector, which only became obvious during the security procedure.
Toyota Camry
"Same thing. Toyota Camry couldn't"
The host also mentions a Toyota Camry as another example of a problem that wasn’t obvious until they tried to do a repair or programming step. It highlights how prior issues can block the process.
The Toyota Camry is mentioned as another example of a situation where a preexisting issue prevented completion of a diagnostic or programming process. The point is that faults may be hidden until a specific procedure is attempted.
twisted wires
"Somebody had taken the key in switch wires and just twisted them together so that it always thought the key was in the ignition... Look at these twisted wires. This was an issue. You just didn't notice it because."
Twisted wires can mean someone connected or damaged wiring in the wrong way. If the car’s computer gets the wrong signal, it can behave incorrectly or refuse to complete tasks like key-fob programming.
Twisted wires in a vehicle context often indicate improper wiring modifications or damage that can create false signals to control modules. Here, the hosts describe wires being twisted so the system always “thinks” the key is in the ignition, which then blocks remote programming.
programming a new remote
"part of programming a new remote to the system is to have the key out of the ignition and it uses that switch to determine that."
Programming a remote means teaching the car to recognize a new key fob. The car often needs the ignition in a specific state while it learns, otherwise it won’t accept the remote.
Remote programming is the process of teaching the vehicle’s immobilizer/keyless system to recognize a new or replacement remote. Many vehicles require specific conditions—like having the key out of the ignition—so the system can correctly determine the state of the ignition switch during setup.
preexisting symptom
"Again, preexisting symptom on a car that either was ignored or just not noticed by the customer, the owner of the vehicle, but now prevents us from being able to do part of our job."
Sometimes the car already had a problem before the customer brought it in. If that earlier issue wasn’t noticed, it can make the new diagnosis harder because you’re chasing more than one thing at once.
A preexisting symptom is a problem that existed before the current repair, but it was ignored or unnoticed. In diagnostics, that can complicate the job because the technician may have to uncover multiple issues—one that caused the original behavior and another that appears to be related to the current work.
subframe
"Now this one, the shop had the subframe down in order to do a transmission before we got involved with it. And they got everything back together, got the transmission programmed or whatever it was that they were doing."
A subframe is like a strong metal platform the car’s big components bolt to. If it gets taken down and put back, it can shift things slightly or disturb wiring, which can cause new warning lights or sensor problems afterward.
A subframe is a structural mounting section that supports major components and is often lowered during drivetrain work. Lowering and reinstalling it can affect alignment, wiring routing, and sensor/calibration targets, which can lead to new faults after reassembly.
steering wheel position as a data PID
"The steering wheel, when it shows the zero position is about 50 degrees to the right. Okay, what I mean by that is if you go into the scan tool and you look at the steering wheel position as a data PID, zero degrees, which should be a straight steering wheel, is off to"
A scan tool can read live numbers from the car. A PID is just the label for one of those numbers. If the steering angle number says “zero” when the wheel isn’t straight, something is wrong with the sensor reading or its calibration.
A PID (Parameter ID) is a specific data stream a scan tool reads from a vehicle’s modules. When the steering wheel position PID doesn’t report “zero” at straight-ahead, it usually points to a calibration or sensor/connection problem in the steering angle system.
alignment rack
"They put it on the alignment rack, they did the toe adjustment to make sure that everything was straight there."
An alignment rack is a machine that measures how your wheels are pointed. Shops use it to adjust things so the car drives straight, but it may not correct sensor calibration problems.
An alignment rack is the shop equipment used to measure and adjust wheel alignment angles (like toe) relative to the vehicle’s reference. Toe adjustment can make the car track straight, but it doesn’t always fix steering sensor “zero” if the steering system was reassembled incorrectly.
toe adjustment
"They put it on the alignment rack, they did the toe adjustment to make sure that everything was straight there."
Toe is how much the front wheels point inward or outward. Adjusting toe helps the car go straight and can reduce tire wear, but it doesn’t necessarily fix steering sensor “straight ahead” settings.
Toe adjustment changes the angle of the wheels relative to each other when viewed from above. It’s commonly adjusted during alignment to improve straight-line tracking and tire wear, but it’s separate from steering-angle sensor centering/calibration.
zero position
"Okay, is this something where we need to learn the zero position, it thinks it's over here, we need to tell it it's over here... this steering centering position will air out if you have the steering wheel straight... But if I put the steering wheel to the right about 50 degrees... then I'm able to get it to pass at that point."
The zero position is the sensor’s idea of where the steering wheel is perfectly straight. If that reference is wrong, the car can get confused about how much you’re turning.
The steering angle sensor’s “zero position” is the reference point the car uses to define straight-ahead steering. If the sensor’s zero is off, the vehicle may think you’re steering when you’re not, causing calibration procedures to fail or to “pass” while the wheel remains mis-centered.
steering centering procedure
"I try running the relearn that's available, and it's a steering centering procedure. And it even says in the procedure, like, you don't need to do this very often. But here's the steps, follow it."
Modern cars need to know what “wheels straight” means. A scan tool runs a step-by-step routine to set the steering sensor’s zero point so the car can drive and steer predictably.
A steering centering procedure is a scan-tool guided calibration that teaches the vehicle where “straight ahead” is for the steering system. It’s typically tied to the steering angle sensor’s zero position so the car can interpret steering input correctly.
intermediate shaft
"They said it was at the base of the rack, right? So you have the steering column, you have the intermediate shaft, which has a couple of U joints on it, that intermediate shaft"
The intermediate shaft is the link between the steering wheel and the steering mechanism. If it’s put back at the wrong angle after being disconnected, the wheel can end up turned while the car thinks it’s straight.
The intermediate shaft is part of the steering column assembly that transmits motion from the steering wheel to the steering gear. It often uses universal joints (U-joints), so if it’s reconnected in the wrong orientation after disconnection, the steering wheel can be off-center even when sensor calibration is attempted.
U joints
"So you have the steering column, you have the intermediate shaft, which has a couple of U joints on it, that intermediate shaft"
U-joints are the flexible connectors that let the steering shaft bend while still turning. If the shaft is put back in the wrong position, the steering wheel may not line up straight.
U-joints (universal joints) allow the steering shaft to transmit rotation through angles. In steering column assemblies, U-joints can make it easier to reassemble components in multiple orientations—so a misalignment can cause the steering wheel to be rotated relative to the vehicle’s straight-ahead direction.
steering rack
"connects with a pinch bolt to the column, and then down at the rack itself. And you can actually get to both of these bolts underneath the dash, you can see where it connects to the top of the rack"
The steering rack is the part that actually turns the wheels when you steer. If the connections between the rack and the steering column are assembled incorrectly, the car can get confused about how much you’re steering.
The steering rack converts rotational motion from the steering shaft into linear movement that turns the wheels. Steering angle data can be derived from different points in the system (column vs rack), so if the rack/shaft connection is misaligned, the sensor readings and module calculations may disagree.
pinch bolt
"connects with a pinch bolt to the column, and then down at the rack itself."
A pinch bolt is a clamp-style fastener that holds two steering parts together. If it’s tightened while the parts are rotated the wrong way, the steering can be “off center” and the car may read the steering angle incorrectly.
A pinch bolt clamps a steering shaft/coupling to the mating component, and it’s often keyed or splined to prevent incorrect assembly. If it’s installed with the wrong clocking (rotational position), the steering system can be off-center, leading to steering angle sensor errors and related diagnostics.
misalignment
"They just misaligned this thing. And we need to get it, you know, back to its center position."
Misalignment here means the steering parts weren’t put back together in the correct straight-ahead position. When that happens, the car’s sensors may think you’re turning more or less than you actually are.
In steering systems, misalignment means the mechanical relationship between the steering wheel, intermediate shaft, and rack isn’t at the intended “center” position. That can cause steering angle sensor readings to be offset, which then makes stability/ABS/power steering modules interpret driver input incorrectly.
center position (steering calibration)
"And we need to get it, you know, back to its center position... rotate that to be straight, put it back together, that's what I'm going to do."
Center position means the steering wheel and wheels are straight ahead. If you take the steering apart and put it back together without re-centering, the car’s sensor may think straight-ahead is slightly turned.
“Center position” refers to the straight-ahead alignment of the steering system, which is the reference point for steering angle measurements and calibrations. After disconnecting and reconnecting steering components, technicians often need to re-center the system so the sensor’s zero point matches the vehicle’s true straight-ahead direction.
rotate the wheel while watching the angle
"I do two things. I turn the wheel slightly while I am watching my angle. And it does not move. If I turn the rack and the wheels,"
This is a diagnostic check: turning the wheel slightly while observing whether the steering angle value changes. If the displayed angle doesn’t move, it suggests the sensor signal isn’t updating (due to misalignment, a disconnected connector, or a sensor fault), which narrows the troubleshooting path.
rack centering / straight-ahead alignment
"we centered the rack before we put it back together here, we went one and a half, one and a half, okay, right in the middle, here's zero."
Centering the rack is lining up the steering so “straight ahead” is truly zero. If it’s off, the car may think you’re turning more/less than you really are, which can cause weird behavior or warning lights.
“Centering the rack” means setting the steering rack to its straight-ahead (zero) position before reassembly. If the rack, steering wheel, and sensor aren’t aligned to the same reference, the car can read incorrect steering angle values and misinterpret left vs right steering.
intermediate steering shaft
"And so I was looking at that intermediate steering shaft one more time. And I was going to take it off at the base of the rack..."
The intermediate steering shaft is a link in the steering column that helps connect the steering wheel to the steering rack. Some versions are designed to move a little for safety, so if it has too much looseness you can get clunks or alignment issues.
The intermediate steering shaft is the section of the steering column between the steering wheel and the rack. In many designs it can telescope or have engineered movement to improve crash safety and reduce harshness, so it can introduce play if not assembled correctly or if parts wear.
telescoping/collapsible steering shaft (crash safety)
"these intermediate shafts, they're two piece, and it slides in and out of one another... meant to collapse in the event of an accident... absorbs some of the movement rather than having the steering wheel... get pushed into your chest."
Certain steering shafts are built to slide and collapse in a crash. That movement helps absorb impact energy so the steering wheel doesn’t shoot forward as violently.
Some intermediate steering shafts are two-piece and slide in/out. They’re designed to collapse in a crash so the steering column absorbs energy and reduces the chance of the steering wheel being driven into the driver’s chest.
steering column clunk over bumps
"they would have a really noticeable clunk over bumps. And what it ended up being was the intermediate shaft, that sliding portion."
If you hear a clunk when driving over bumps, it can mean there’s looseness somewhere in the steering column. Even safety-designed parts can develop too much play over time.
A “clunk” over bumps often points to play or wear in steering column components, such as the intermediate shaft’s sliding section. Because these shafts are designed to move slightly, normal tolerances exist—but excessive play can create noise and sometimes contribute to perceived misalignment.
GM
"if you worked on GMs back in the early 2000s, on the trucks and the cars, they would have a really noticeable clunk over bumps."
GM (General Motors) is referenced as the platform where the speaker previously saw this intermediate-shaft clunk issue on early-2000s trucks and cars. This helps listeners connect the diagnostic pattern to a known family of steering-column designs.
steering wheel off-center due to mis-indexed steering shaft
"So what happened was when they disconnected the intermediate shaft underneath the dash, those two pieces from gravity probably slid apart... it was one notch off. And so there was a disconnection from the center of the steering wheel and the center of the rack..."
Cars assume that when the steering wheel is centered, the front wheels are also centered. If a shaft is put back slightly wrong, the steering wheel can look straight while the car’s wheels aren’t (or vice versa), which can confuse steering-angle-related diagnostics.
Steering systems rely on correct “indexing” between the steering wheel, steering column components, and the steering rack. If the intermediate shaft separates and is reassembled one notch off, the wheel angle sensor (or steering angle calibration) can effectively be wrong, because the wheel’s “center” no longer matches the rack’s center.
steering wheel angle positions
"But interesting how they ended up being steering wheel angle positions within the same week. So that's all I've got for today's episode..."
This is basically “how far the wheel is turned” versus “where the wheels are actually pointed.” If the connection is assembled wrong, those two don’t match up the way the car expects.
“Steering wheel angle positions” refers to the relationship between the steering wheel’s rotational position and the actual steering rack/wheel alignment. When the indexing is wrong, the same physical steering rack position can correspond to an incorrect wheel angle reading, which can show up as diagnostic trouble codes or alignment complaints.
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