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The Truth About Diag, Flat Rate Pay, and Shop Culture with Josh Whiteman

The Truth About Diag, Flat Rate Pay, and Shop Culture with Josh Whiteman

The Jaded Mechanic Podcast Feb 10, 2026 95 min
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About this episode

Josh Whiteman, a full-time instructor with Garage Gurus, shares insights on the importance of continuous learning in the automotive industry. He discusses the challenges of flat-rate pay, the evolving shop culture, and the value of hands-on experience in diagnostics. With a focus on mobile diagnostics and the creation of case studies, Josh emphasizes the need for technicians to adapt and grow. The conversation also touches on the significance of effective communication with customers and the impact of social media on perceptions of automotive professionals.

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Technical Too Afraid to Ask
Term

EVAP system

"...there was a Mazda with a shorted wiring to the EVAP system way in the back connector, pass-through, and it was all corroded and everything."

The EVAP system helps keep fuel vapors from polluting the air. It stores these vapors and sends them to the engine to be used as fuel instead of letting them escape into the environment.

Term

case studies

"...I made probably like 25 roughly case studies over the previous year, um, which is obviously quite a bit..."

Case studies are examples of car problems that have been studied closely to understand what went wrong and how it was fixed. They help mechanics learn from each other's experiences.

Term

wholesalers

"...my best customers are probably a lot of other mobile guys' worst customers because my best customers are the used car lots and they're the wholesalers."

Wholesalers are companies that buy many cars at once, usually to sell them to other car sellers. They focus on selling a lot of cars quickly, even if they don't make much money on each one.

Term

ADAS

"...you know, just start. Just say that right now, just start. There's not a single there's not a single good reason not to do ADAS."

ADAS means Advanced Driver Assistance Systems. These are special features in cars that help drivers stay safe, like warning you if you're drifting out of your lane or helping you brake automatically.

Term

Red Seal program

"...you guys have the Red Seal program. So when I teach in Canada, yeah, I would say there's definitely a higher baseline knowledge..."

The Red Seal program is a way for skilled workers in Canada to prove they are qualified to do their jobs. It helps them work in different parts of the country without needing to take extra tests.

Term

Ohm's law

"...to know what Ohm's law is, right, to, to know your basic stuff, set the groundwork..."

Ohm's law is a rule that helps us understand how electricity works. It explains how much electricity flows through a wire based on the voltage and resistance.

Term

pressure transducer

"...if I'm gonna spend weeks, months, however long building a class and designing a class, who should I cater it to? The 1% who's gonna maybe take away 1% of what I've got to say, you know, or the general masses, right..."

A pressure transducer is a tool that measures how much pressure is in something, like a tire or engine. It sends this information as an electrical signal so that it can be monitored easily.

Term

module

"I just had a Tahoe you know, I was chasing down a no communication issue and it was to a single module. And, uh, you know, of course I do my basic checks— check power, ground, right? Check power, ground, and comms."

A module in a car is like a small computer that controls different parts of the car. For example, one module might help manage the engine, while another controls the lights.

Term

corrosion

"There are so many times that I can test right up to that back probe and everything and it looks good, but what I'm needing to turn on still doesn't turn on. And then I just unplug that. It's become a bad habit of mine to unplug and look. And then I do my testing non-intrusively at the front, don't spread the pins and all that. But then I talk to other people and they're like, oh man, as soon as I touched it, everything started to work. Well, if you can slow down and back up and think for a minute what you did, you probably we found your problem, right?"

Corrosion is when metal parts get damaged over time because of moisture or chemicals. This can cause problems in how the car works, especially with electrical connections.

Term

diagnostic strategy

"Absolutely. That's why we talk about like a diagnostic strategy and a diagnostic process, you know. And I cannot sit here and tell you what yours should be, right? Because you live in a different area, you work on different cars."

A diagnostic strategy is how a mechanic figures out what's wrong with a car. It involves checking different parts and running tests to find the problem.

Term

TSB

"...look for updates, look for TSBs. Like, that's just one. But where, where does it go from there..."

A TSB is a notice from a car manufacturer that tells mechanics about common problems with certain models and how to fix them. It's like a guide to help them solve issues more easily.

Term

EVAP light

"...it's an EVAP light. Eh, screw it, it'll be fine. You know what I mean? It's not gonna be drivability concern..."

The EVAP light on your dashboard means there's an issue with the system that keeps fuel vapors from leaking into the air. It's important to fix it to keep your car running cleanly.

Term

code scan

"...we're going to pull it in, do a code scan, you know. And then again, at this point..."

A code scan is when a mechanic checks your car's computer for error messages that can tell them what's wrong with the vehicle. It's like reading a report card for your car's health.

Term

mass airflow sensor

"...it's another lean code or a mass airflow sensor code or whatever..."

The mass airflow sensor is a part that checks how much air is going into the engine. It helps the car know how much fuel to use for the best performance. If it breaks, the car might not run well.

Term

lean code

"...I always use just a lean code as an example because we see it all the time..."

A lean code means there's too much air and not enough fuel going into the engine. This can make the car run poorly and cause more pollution. It usually means something needs to be fixed.

Term

fuel trim

"...you start to look at your fuel trim at idle versus load and determine..."

Fuel trim is how the car's computer adjusts the amount of fuel going into the engine to make sure it runs well. It helps keep the engine efficient and reduces pollution.

Term

O2 sensor

"...I was watching the oxygen sensor under wide open throttle and it's like dropping to 0.5..."

An O2 sensor checks how much oxygen is in the car's exhaust. This helps the car's computer decide how much fuel to use for the best performance and to reduce pollution.

Term

OBD1

"Come on, GM fuel pumps, OBD1, come on, man."

OBD1 is an early car computer system that helps mechanics find problems with the engine and emissions. It gives basic error codes to help diagnose issues.

Term

Mode 6

"So what, um, so you talk about Mode 6, and again, that's a lot that like I still feel like it's not addressed..."

Mode 6 is a part of the car's diagnostic system that helps mechanics check how well different parts are working. It gives more detailed information than basic error codes.

Term

voltage drop

"Well, I think a huge one is voltage drop, right? And it's kind of on the same topic of, you know, loading a circuit."

Voltage drop is when the electrical voltage decreases as it travels through wires. Mechanics check this to find problems in the car's electrical system.

Car

Jeep Wagoneer

"I was just starting to do some actual, um, some videos and, um, whatnot on a brand new Wagoneer..."

The Wagoneer is a large SUV made by Jeep. It's designed for families and off-road adventures, with lots of space and modern features.

Term

OBD2

"...you connect the tool to the OBD2 port and then you disconnect the 12-volt battery..."

OBD2 is a newer car computer system that helps mechanics check for problems in real-time. It's more advanced than the older OBD1 system and is found in most cars made after 1996.

Term

Power Probe

"...we had the new PP Draw, which is again Power Probe, you know, figure it out..."

Power Probe is a tool that mechanics use to check electrical systems in cars. It helps them find problems with wiring and connections quickly.

Term

12-volt battery

"...you connect the tool to the OBD2 port and then you disconnect the 12-volt battery..."

A 12-volt battery is the main battery used in cars. It provides power to start the engine and run things like lights and radio.

Term

auxiliary battery

"Well, real. that's The auxiliary battery is still supplying all the load to the necessary loads..."

An auxiliary battery is an extra battery in a car that helps provide power for things like lights and electronics, especially when the main battery isn't enough.

Term

service information

"...it wasn't until I went into service information, I'm just looking at everything..."

Service information is the technical details and instructions that car makers give to help mechanics fix cars. It includes things like wiring diagrams and repair steps.

Term

pinpoint tests

"Well, the damn pinpoint tests for the past 50 years have been checking for resistance..."

Pinpoint tests are detailed checks that mechanics use to find specific electrical problems in cars. They help narrow down the cause of an issue step by step.

Term

resistance

"...there's a million different flaws with checking for resistance..."

Resistance is how much a material slows down electric current. In cars, high resistance can mean there are problems with the wires or connections that need fixing.

Term

corroded battery terminals

"...the battery terminals are corroded. That's bad, man."

Corroded battery terminals are when the connections on a car battery get rusty or dirty. This can make it hard for the car to start or cause electrical problems.

Term

Bureau of Automotive Repair

"We have the Bureau of Automotive Repair. So if a customer is upset, you know, they go home, whatever. There's a government agency specifically for auto repair in which they can complain to."

This is a government office that helps people with car repair issues. If someone feels they were treated unfairly by a repair shop, they can report it to this agency for help.

Part

starter motor

"I can hear that starter and know that the Bendix is shot, right? Or I can hear it or I can smell it."

This is a part of the car that helps start the engine. If it doesn't work properly, the car might not start at all.

Term

battery terminal cleaning

"I know we talked about that battery terminal cleaning. You know, it is very important. It does have to get done."

This is when you clean the parts of the battery where the cables connect. Keeping them clean helps the car start better and keeps the battery working longer.

Term

flat rate tech

"...I'm a flat rate tech, I've always been a flat rate tech, but I've got no problem at all if you ask..."

A flat rate tech is someone who gets paid a fixed amount for each repair they do, instead of being paid by the hour. This means they can earn more money if they work quickly.

Part

headlight bulb

"...I always liken the, the wiper blade and the headlight bulb conversation, or a taillight bulb or anything like that..."

A headlight bulb is the light that helps you see when driving at night. Sometimes, changing it can be tricky and may require taking off other parts of the car.

Part

taillight bulb

"...I always liken the, the wiper blade and the headlight bulb conversation, or a taillight bulb or anything like that..."

A taillight bulb is the light at the back of a car that shows when the car is stopping or turning. Changing it can sometimes be complicated depending on the car.

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