The Weirdest Ram Failure We’ve Seen (Fixed)

The speaker is referring to Ford Mustang "five liter" cars, which implies a V8 engine displacement around 5.0 liters. They mention supercharging, which means forced induction is used to make more power than the stock engine output.

Supercharged means the engine uses a belt-driven compressor (a supercharger) to force extra air into the cylinders. More air typically allows more fuel to be burned, which can significantly increase power compared with a naturally aspirated setup.

A "RAM 4500" is a heavy-duty pickup/truck from Ram (the brand within Stellantis) aimed at commercial work. The "4500" designation generally indicates a higher payload/GCWR class than lighter Ram pickups, so its diesel systems and service needs are more truck-like than passenger-car-like.

Fuel filters are service items that remove dirt and contaminants from diesel fuel before it reaches the injection system. On newer diesel trucks, filter designs and part numbers can change, so using the correct fuel filter is important to avoid poor fuel delivery or repeat faults.

The check engine light is the dashboard warning that the engine control module (ECU) has detected a fault. On diesel trucks, it can be triggered by anything from sensor issues to fuel delivery problems, so it’s the starting point for diagnostic scanning.

ABS (anti-lock braking system) prevents the wheels from locking up during hard braking. It does this by rapidly modulating brake pressure, helping the driver maintain steering control while braking.

Traction control is a driver-assist system that reduces wheel spin when the tires lose grip. It typically works by cutting engine power and/or applying brakes to individual wheels so the car can regain traction.

Four-wheel drive (4WD) sends power to both the front and rear axles to improve traction. Many 4WD systems can be full-time or part-time, and some are electronically managed based on wheel slip and driving conditions.

“Scanning” refers to using an OBD (on-board diagnostics) tool to read stored trouble codes from the vehicle’s computers. Those codes point to the likely circuit or component causing the fault, like a specific ABS sensor.

Those are diagnostic trouble codes (DTCs) that identify the fault type and location the vehicle’s computer has detected. In this case, the codes are used to determine the correct ABS-related test path and confirm the repair.

A Dodge dealer is the factory-backed retail and service network for Dodge vehicles. Dealer parts availability and next-day shipping can matter when you need a specific OEM (original equipment manufacturer) sensor quickly.

A “road test” is a structured drive used to reproduce a fault under real driving conditions. By including curves, elevation changes, and varying loads, the technician can better correlate the symptom with what the vehicle’s sensors and codes are reporting.

A “drivability issue” is a problem that affects how the car drives—things like hesitation, surging, jerking, or throttle response problems—rather than a simple “won’t start” failure. Technicians often use controlled road tests to reproduce the symptom so the scan data matches what the driver feels.

In this context, “codes” are diagnostic trouble codes stored by the vehicle when it detects a fault. Multiple codes often indicate either one root cause that triggers several symptoms, or several separate issues that need to be prioritized.

“Scan tools” are diagnostic devices that plug into a vehicle’s onboard computer (OBD-II) to read fault codes and live sensor data. They’re how a technician turns a symptom like weird throttle behavior into specific trouble codes to guide the repair.

Wheel speed refers to how fast each wheel is rotating, typically measured by wheel-speed sensors. ABS uses these signals to detect impending wheel lockup and to control brake pressure accordingly.

A communication code indicates that two electronic modules aren’t exchanging data correctly over the vehicle’s network. When the transmission control module and ABS module can’t communicate as expected, it can cause cascading faults that may not be fixed by replacing only one sensor.

The transmission control module (TCM) is the computer that manages automatic transmission shifting and related control strategies. In modern vehicles, it can also exchange diagnostic/communication messages with other modules like the ABS module.

In this context, “opened up a can of worms” means the initial repair attempt (replacing an ABS sensor) revealed deeper or additional faults. It’s a common diagnostic experience when one symptom masks multiple underlying issues.

A pinpoint test is a structured diagnostic procedure used by service manuals to isolate a fault step-by-step. It typically starts with checks like sensor inputs, then moves to wiring/ground tests, and finally to module replacement only if earlier steps fail.

A “short to positive” means a wire or circuit is accidentally contacting the vehicle’s positive power feed. That can cause abnormal voltage readings and communication faults, so technicians use meter tests to confirm whether the circuit is shorted.

A “short to ground” means a wire or circuit is accidentally contacting the vehicle’s chassis/ground. It can pull voltage down unexpectedly, leading to sensor/module errors and communication issues that are hard to diagnose without electrical testing.

Cloud-based programming refers to using an online service to download software/calibration and authorize updates for a vehicle module. After replacing an electronic control unit, technicians often must program it so it matches the car’s configuration and passes security checks.

A sealed connector is a factory-style electrical plug that’s designed to resist moisture and contamination. When it’s “glued together” or otherwise non-serviceable, it limits the ability to unpin wires for swapping/testing, pushing diagnosis toward module-level or harness-level replacement.

The chassis harness is the vehicle’s main wiring bundle that runs along the frame/chassis to power and connect many systems (lights, sensors, modules, etc.). In a commercial truck, it’s especially important that the harness is routed and secured correctly so it doesn’t rub, get pinched, or end up disconnected.

Bulkhead connectors are electrical connectors that pass through or mount at a bulkhead (a structural wall/divider between compartments). They’re common places for wiring to be joined or routed between the cab/body and other areas, so a loose or damaged connector there can trigger diagnostic trouble codes.

Pin tension refers to how firmly the electrical pins/terminals are held inside their connector housings. If pin tension is weak, terminals can back out slightly, leading to intermittent connections, sensor dropouts, or codes that appear only when the harness is moved.

“White tech” appears to be the shop’s diagnostic scan tool used to read fault codes and monitor the truck’s systems while the technicians manipulate wiring. When a code shows up, it “beeps,” indicating the tool detected a specific fault condition.

This describes a common diagnostic technique for intermittent electrical faults: manipulate the wiring harness while watching the scan tool for codes. If moving the harness triggers a code, it strongly suggests a connection issue such as a loose terminal, poor routing, or harness damage from installation.

A “hard code” is a diagnostic trouble code that the vehicle’s computer considers confirmed and persistent, not just a temporary glitch. Because it “won’t clear,” the underlying issue is still present—commonly wiring, a connector, or a sensor signal problem.

“Logic to the transmission” refers to the control signals and communication wiring that allow the transmission control unit to coordinate shifting and related behaviors. If those communication wires are routed through a damaged harness, the transmission may report faults or behave unexpectedly.

This describes a common modern-vehicle diagnostic pattern: a single wiring harness fault can create multiple unrelated-looking codes across ABS, sensors, emissions controllers, and even transmission communication. The hosts are effectively doing harness “wiggle testing” to reproduce the fault and confirm the root cause.

VOR here is a vendor ordering process used to get parts for a vehicle that’s currently “down” (not in service). The host mentions it as “high priority” and tied to expedited shipping (“next day air”) once the vendor can produce it.

Mopar is the parts-and-service brand associated with Chrysler/Fiat vehicles, commonly used for OEM (factory) parts and dealer supply channels. Here, it’s referenced as having its own vendor ordering process (VOR).

A “heater grid” upgrade refers to improving the vehicle’s heating elements used for cold-weather operation, typically to help with starting, warm-up, or emissions-related temperature targets. The host frames it as a way to address a problem while the truck is already out of service.

The host is describing how warranty coverage can change after a commercial vehicle is modified by a body manufacturer. Even if the engine remains under warranty, other systems affected by the upfitter/body work may fall outside the original manufacturer’s warranty responsibility.

Bosch runs a technical service network that can be used to look up reported issues tied to a specific vehicle. In this segment, the host mentions using a VIN so Bosch network technicians can reference what others have seen.

VIN (Vehicle Identification Number) is a unique 17-character code that identifies a specific vehicle. Service networks use it to pull the right repair history, parts information, and technical bulletins for that exact truck.

A “75 pin connector” refers to a large multi-pin plug used to carry many circuits at once. The host’s point is that repinning a connector that large (disassembling it and moving individual terminals) is impractical compared with removing/lifting the cab to replace the harness.

“Programming” in modern trucks usually means using diagnostic tools to update or configure electronic control modules (ECUs) so the new wiring/hardware communicates correctly. The host has a friend who can connect and verify the truck’s behavior after the harness replacement.

“Read a signal” refers to using a scan tool/diagnostic interface to pull data from the truck’s sensors and control modules. The host says that early on they couldn’t even read a signal, which suggests a communication/power/ground issue rather than a simple mechanical fault.

In this context, a magneto-type sensor generates an electrical signal from the wheel’s motion using a magnetic pickup. As the sensor sees changing magnetic field strength, it produces a small AC waveform that the ABS electronics interpret as wheel speed.

An AC signal is an alternating electrical waveform that changes back and forth over time. For wheel-speed sensors, the ABS expects a specific small AC waveform (often varying with wheel speed), so the waveform’s shape, frequency, and amplitude matter.

A scope (oscilloscope) is an electronic test instrument that displays a signal’s waveform over time. Here, they use it to measure the sensor output and then adjust for frequency and amplitude until the ABS-relevant AC pattern shows up clearly.

Frequency is how often the signal waveform repeats (related to wheel speed for a wheel sensor). Amplitude is the signal’s strength/height; if it’s too small or too noisy, the ABS module may misinterpret the wheel-speed input.

When a sensor waveform is described as “noisy,” it means the signal contains unwanted electrical fluctuations on top of the real pattern. Noise can make it harder for the ABS electronics to detect the correct wheel-speed signal, leading to erratic behavior.

The brake caliper is the clamp that squeezes brake pads against the rotor to slow the vehicle down. In this context, the speaker says the caliper comes with the hub, meaning it’s being removed as an assembly during the repair.

“Toning” here appears to be the rotor/hub-related component the caliper is mounted to, and the speaker is diagnosing a physical defect on its surface. They find a shiny band where the factory coating is missing, then measure “run out” to quantify how uneven the part is.

An electroplated coating is a metal layer applied using an electrical process to improve corrosion resistance or surface properties. Here, the speaker contrasts the factory coating with a shiny wear area, suggesting the coating has been worn through where the component contacted abnormally.

Run out is a measurement of how much a rotating part deviates from being perfectly true—essentially how much it wobbles side-to-side as it spins. The speaker measures “20 to 50 thousands” (thousandths of an inch), which indicates the rotor/toning is not straight enough and can cause vibration or uneven brake contact.

A “clean signal” means the sensor output is stable and consistent enough for the vehicle’s control modules to interpret correctly. Here, the host gets a clean signal after reassembly, which allows them to capture a wheel-speed picture and identify an imbalance between wheels.

A “signal problem” refers to incorrect or missing sensor input (for example, a wheel-speed or position sensor) that the vehicle uses to make traction/ABS/4WD decisions. The key point is that when the system detects this kind of fault, it can disable functions and even “take away” throttle response as a safety strategy.

Throttle input is the electronic signal that tells the engine control system how much you’re asking for via the accelerator pedal. When the speaker says “55% or more throttle input,” they mean the condition only triggers above that pedal/command level, which helps narrow down the fault.

A “voltage wire” here refers to a wire carrying an electrical voltage signal that can accidentally couple into another circuit. The speaker describes the voltage wire’s signal “jumping” into the APPS signal wire, which is a classic wiring/EMI/crosstalk-style diagnostic clue.

APPS usually means the Accelerator Pedal Position Sensor (or sometimes the throttle position sensor in casual shop talk), which reports pedal/throttle position to the engine computer. The speaker is describing a wiring/signal issue where the APPS-related signal gets affected by another jumping voltage wire, causing incorrect readings.

When two wires rub together, their insulation can wear through, leading to intermittent shorting, signal cross-talk, or incorrect sensor readings. The speaker links this to the APPS signal being affected, which is why the fault only appears under certain throttle input conditions.

An alternator generates electrical power and its voltage can create noise or interference if wiring is routed poorly. In this case, the alternator’s voltage signal appears to have been coupling into the APPS wiring, corrupting the sensor input.

A rewire is a repair where the technician changes how wires are routed or replaced to prevent electrical interference or shorts. Here, rerouting the wiring was used to stop the corrupted sensor signal problem.

A reflash is updating the vehicle’s electronic control unit (ECU/PCM) software with a new calibration. It’s often used when drivability issues are caused by software logic, but it won’t fix problems caused by wiring or sensor signal corruption.

This points to how modern vehicles use more electronics and tighter integration between modules. As systems became more complex, wiring quality, shielding, and proper circuit separation became more critical to prevent cross-talk and signal corruption.

“Body on” refers to the manufacturing step when the vehicle body is installed onto the chassis. The speaker suggests the wiring/harness work may have been rushed during assembly, leading to improper wire separation and later electrical faults.

Shielded wires have an outer conductive layer that helps block electromagnetic interference from nearby wires or electrical noise. In this repair, shielded twisted-pair wiring was used to keep the ABS-related signals from being contaminated by other circuits.

Twisted pair wiring means two conductors twisted together along their length. This reduces interference and helps cancel out noise, improving signal integrity for sensors and control-module communication.

The body harness is the main wiring network that routes power and signals throughout the vehicle’s body. Because it connects many modules, mistakes in harness routing or pin assignments can create cross-talk where one circuit affects another.

“Octopus harness” is the speaker’s nickname for a large, multi-branch wiring harness under the hood that connects to many modules. The key point is that this harness routes lots of circuits together, so poor separation can increase the chance of electrical interference.

The fuel tank is the vehicle’s storage container for gasoline or diesel. In this story, the harness/conduit was left sitting on top of the tank, where it could move and rub through over time.

Conduit is protective tubing or a sleeve that routes and shields wiring from abrasion and heat. Here, the conduit applied from the factory was rubbed through, which exposed the wiring to damage even if there were no bare wires yet.

Pins are the metal contacts inside electrical connectors that make the actual electrical connection. Replacing pins can restore proper contact tension and corrosion resistance when old terminals have been damaged or compromised.

A test drive is a road test used to confirm a repair fixed the issue under real driving conditions. The host describes taking the truck out for an hour after rewiring to verify it stayed “cherry” (working correctly).

An invoice is the itemized bill for labor and parts after a repair. The host uses it to explain the customer impact: time without the truck during a season start can be costly for a working crew.

“Back in service” means the vehicle is operational and available for its intended work. In fleet or commercial use, being down can directly reduce productivity because there may be no backup vehicles ready.

A “mothball fleet” refers to backup vehicles stored away and kept in reserve for emergencies. The host contrasts their situation—no ready spares—with having backup trucks available when something breaks.

This describes the shift in diesel trucks from older systems that relied mostly on mechanical controls (like purely mechanical fuel delivery) to modern trucks that use electronic control modules and sensors. The computerization changes how problems are diagnosed and repaired because faults often show up as sensor/ECU codes rather than purely mechanical wear.

DFC Diesel is an aftermarket remanufacturer that supplies rebuilt diesel engines for popular heavy-duty platforms. In this segment, they’re positioned as a sponsor offering remanufactured Cummins, Duramax, and Powerstroke engines with quality standards and warranty coverage.

Remanufactured engines are rebuilt to a like-new standard by disassembling, inspecting, replacing worn parts, and reassembling with controlled specifications. In the diesel aftermarket, remanufacturing is often chosen to reduce cost and downtime versus buying a brand-new engine, while still targeting reliability.

ISO 9001:2015 is a widely used international standard for quality management systems. When an aftermarket engine builder claims ISO 9001:2015, it generally means they follow documented processes for manufacturing, inspection, and continuous improvement—aimed at consistent quality.

An OEM engine is an Original Equipment Manufacturer engine—built to the same design/spec as what the truck came with from the factory. The speaker contrasts “basic OEM” with options that aim to reduce the chance of repeating a failure.

“Tow/Haul” is a diesel-truck operating mode that changes transmission behavior (and sometimes engine/shift strategy) to better handle heavy towing. It typically prioritizes stronger engine braking and different shift timing to keep temperatures and drivability under load.

“Speed of air” appears to be a branded series name for a specific engine configuration or calibration level offered by DFC Diesel. Because it’s presented as a named series (alongside “core street” and “tow haul”), it likely refers to a particular build spec intended for different use cases.

Pistons are the parts that move up and down inside the engine’s cylinders, compressing air/fuel and transferring force to the connecting rods. In performance or built engines, piston selection can be important for durability under higher temperatures and pressures.

Fuel economy is how efficiently an engine converts fuel into motion, usually expressed as miles per gallon (or liters per 100 km). In diesel tuning and fuel-additive discussions, it’s often linked to improved combustion and reduced friction/wear from better lubrication.

Torque is the twisting force an engine produces, and it strongly affects how quickly a vehicle accelerates, especially at lower speeds. Diesel engines are often discussed in terms of torque because they can deliver strong pull without needing high engine speeds.

The valve train is the system that opens and closes the engine’s intake and exhaust valves (via components like camshafts, lifters, and springs). Upgrading it can support higher airflow and durability when an engine is built for more power.

In an engine, connecting rods (often shortened to “rods”) transfer force from the pistons to the crankshaft. Performance builds may choose stronger rods to handle higher cylinder pressures and reduce the risk of mechanical failure.

“Cranks” refers to the crankshaft, the rotating shaft that converts the pistons’ up-and-down motion into rotational motion. In higher-output builds, crankshaft choices can affect strength, balance, and how reliably the engine handles stress.

This segment discusses how diesel fuel additives are used to prevent costly repairs by improving fuel properties. The hosts connect additive chemistry to injector cleanliness, lubricity, and combustion behavior.

In diesel fuel, lubricity is how well the fuel lubricates the fuel system components (like the injection equipment) as it flows through them. If lubricity is too low, parts can wear faster, which can lead to expensive drivability and repair issues.

Hot Shot Secret is the brand behind a diesel fuel additive they claim improves fuel system health and combustion. In this segment, they’re positioned as addressing diesel lubricity and injector-related issues.

“Hot Shot’s EDT” is the specific Hot Shot Secret diesel additive mentioned here. The host claims it cleans injectors, boosts cetane, and improves lubricity compared with a “leading competitor.”

Cetane is a measure of how readily diesel fuel ignites under compression. Higher cetane generally helps the engine start more easily and can improve combustion quality, which may translate to better efficiency and reduced stress on the engine.

Diesel injectors are the components that precisely spray fuel into the combustion chamber at the right time and pressure. When injectors get dirty or worn, fuel atomization and timing suffer, which can cause rough running, smoke, and power loss.

“Lemon law” is a consumer protection rule that can require a manufacturer to buy back or replace a vehicle that has repeated defects that the dealer can’t fix after a reasonable number of attempts. In the context of this episode, it’s being contrasted with the idea that the truck’s failure was serious enough to affect someone’s livelihood rather than being resolved by a buyback or replacement.

A wiring harness is the bundled set of wires and connectors that routes power and signals throughout a vehicle. If the harness is routed incorrectly or has a factory defect, it can cause intermittent faults that are hard to diagnose—especially when symptoms appear only under certain conditions or after time.

Signal distortion means the electrical signal being sent (often from a sensor) is altered—by noise, wiring issues, or interference—so the receiving module interprets it incorrectly. In diagnostics, this can look like a “mystery” problem because the fault may depend on routing, load, temperature, or vibration.

“Magnetic resistance” is being used here to describe how magnetic effects influence an electrical signal in the wiring. In automotive sensing, changes in magnetic behavior can alter the signal a sensor produces, which then affects how the vehicle interprets data.

A “communication signal” in vehicles usually refers to data being transmitted between modules (like the engine/ECU, body systems, and other controllers) over wiring. If the signal is distorted or interpreted incorrectly, it can trigger faults that are hard to trace.

In a modern vehicle, diagnostics are the step-by-step process of using onboard fault codes, sensor readings, and test procedures to pinpoint what’s causing a problem. It’s more than just “reading a check-engine light”—it’s about confirming the root cause before replacing parts.

The Mercedes-Benz Sprinter is a modern commercial van platform that uses extensive electronics, so electrical issues can trigger lots of unrelated-looking symptoms. In this segment, the host describes scanning a Sprinter that had many fault codes and “weird things” happening, which is typical of complex vehicle networks.

The Ford Flex is a full-size, family-oriented crossover wagon made by Ford, known for its boxy shape and roomy interior. It’s the kind of vehicle that can come up in diesel/exhaust discussions because exhaust leaks—especially at joints—can create loud noises, strong fumes, and in severe cases visible flames. That’s likely why it was mentioned in the context of a flex-joint exhaust issue.

An exhaust leak at a flex joint means the seal in the flexible section of the exhaust system is failing. Leaking hot exhaust gases can overheat nearby components and, in severe cases, ignite or damage wiring—leading to electrical faults.

A heat shield is a protective panel used near hot exhaust components to reduce heat transfer. In this case it’s blocking visibility of the underlying issue, but the wiring still ends up too close to heat and melts.

A wire harness is the bundled set of wires and connectors that routes signals and power throughout the vehicle. If it’s not clipped/secured correctly, it can contact hot components (like near the DPF) and cause shorts, melted wiring, and multiple fault codes.

DPF stands for diesel particulate filter. It traps soot from a diesel engine’s exhaust and periodically needs regeneration to burn that soot off; if wiring or sensors around it fail, you can get drivability or warning-code issues.

Communication wires carry data between modules (computers) rather than just power. If these are damaged or shorted, you can see odd behavior and multiple diagnostic trouble codes because modules can’t reliably talk to each other.

“Not in park” indicates the transmission range/position sensing system believes the vehicle isn’t in Park. Wiring faults can confuse the signal, leading to intermittent warnings that may be tied to broader electrical/communication problems.

A driver’s door module is a body electronics control unit that manages functions like locks, windows, and door-related sensors. When it’s affected by shorts or wiring issues, you can get codes that don’t directly impact engine running but still indicate electrical faults.

A seat belt buzzer warning is the audible alert triggered when the vehicle detects an unbuckled seat belt (or a fault in the seat belt detection system). Shorted wiring or a failed sensor can cause the warning to appear even if the engine is unaffected.

An “aftermarket turbo” is a turbocharger installed from outside the original manufacturer’s parts. Changing boost hardware can increase stress and alter airflow, so it often requires matching fueling and engine calibration; otherwise it can contribute to drivability or component failures.

The speaker contrasts parts quality with “quality of workmanship,” arguing that installation practices can be as responsible for failures as the aftermarket parts themselves. In injector/fuel-system work, details like correct wiring routing, proper torque, and complete hardware installation strongly affect reliability.

“Common rail” is a diesel fuel-injection architecture where fuel is pressurized in a shared high-pressure “rail” and then delivered to the injectors as needed. Because the rail pressure and injector timing are tightly controlled, mismatched or low-quality injectors—and incorrect installation—can cause the system to behave erratically.

The “fuel injection system” is the set of components that meters and delivers diesel fuel to the cylinders at the right pressure and timing. On common-rail diesels, problems in this system can come from bad parts, incorrect calibration, or poor installation quality.

The speaker says the injector work must be “bosh stuff,” referring to Bosch-branded components. For diesel common-rail injectors, using the correct manufacturer parts is important because quality and calibration expectations differ across brands and aftermarket sources.

“Onesies/twosies” here means mixing and matching individual injectors (not replacing as a matched set). In common-rail systems, mixing parts from different sources can lead to inconsistent behavior and make diagnosis harder.

Aftermarket parts are components made by companies other than the vehicle’s original manufacturer (OEM). In diesel repair, quality can vary a lot, so the same “type” of part can perform very differently depending on brand and manufacturing tolerances.

In this context, “black box” is a slang term for an unknown or poorly documented aftermarket electronic component/module. Shops and enthusiasts use it to describe parts that may function, but whose internal design, calibration, or quality control isn’t transparent—making diagnosis and reliability harder.

This is describing a systems idea: a vehicle is happiest when its design assumptions and operating conditions stay aligned. When that “dynamic” is disturbed—like changing how parts fit, how components are routed, or how the truck is assembled—problems can show up.

In this context, “washer” likely means a small sealing or mounting component that has to be installed in the correct location and condition. On diesel trucks with lots of underbody hardware, small fitment details can affect sealing, vibration, and long-term reliability.

They’re framing diesel truck ownership as being heavily influenced by early detection of issues and consistent workmanship. The idea is that noticing what will “pop up” over the next few thousand miles is part of preventing the kind of failure that leads owners to quit diesel entirely.