Vehicle Diagnostics in Cheyenne, Wyoming
Honesty & Quality
A repair is only as good as the diagnosis behind it. At TDC Automotive & Light Duty Diesel, every diagnostic job follows the same proven procedure: verify the complaint first, visually and physically inspect the vehicle, scan for trouble codes, then test to confirm the failing component before anything gets replaced. That last step matters — a trouble code tells you where the problem is showing up, not necessarily what caused it.
That approach is the opposite of parts-swapping, where a shop keeps replacing components on your dime until the symptom goes away. Trevor tests first, confirms the failure, and then quotes the repair. You pay to fix what is actually broken — nothing more.
Diagnostics Services
Engine Diagnostics
A check engine light can mean anything from a loose gas cap to a failing sensor to a mechanical problem inside the engine.
Learn more →Vibration Diagnostics
Vibrations are one of the hardest complaints to pin down — they can come from tires, wheels, driveshafts, U-joints, wheel bearings, brakes, engine mounts or suspension components, and they often only show up at certain speeds or loads.
Learn more →Exhaust Leak Diagnostics
An exhaust leak announces itself if you know what to listen for — the sound of air rushing past an opening, a ticking that changes with RPM, or a high-pitched squeal under load.
Learn more →AC & Heating Diagnostics
In Wyoming you need both sides of the climate system to work — summer sun on the high plains and winters that turn a dead heater into a safety problem.
Learn more →Oil Leak Diagnostics
Oil runs downhill and gets blown backward by airflow, which is why the wet spot you can see is often not where the leak actually starts.
Learn more →Coolant Leak Diagnostics
A coolant leak never fixes itself — it either drips where you can see it or disappears somewhere worse, like into the engine.
Learn more →Driveshaft Diagnostics
A clunk when you shift into gear, a squeak that speeds up with the truck, or a vibration that builds with road speed usually points at the driveline — worn U-joints, a failing carrier bearing, or a driveshaft that's bent or out of balance.
Learn more →How Trevor Diagnoses a Problem
- Verify the complaint
Before touching a wrench, Trevor reproduces the symptom you're describing — sometimes on a test drive with you in the passenger seat so you can point out exactly what you're feeling or hearing.
- Inspect the vehicle
A visual and hands-on physical inspection often reveals what a scan tool can't: chafed wiring, soot trails, wet gaskets, loose components.
- Scan for trouble codes
Diagnostic trouble codes (DTCs) narrow the search to the right system and circuit.
- Test to confirm
The suspect component gets tested and confirmed as failed before it's replaced. Then the repair is verified with a final test drive.
Frequently Asked Questions
What does vehicle diagnostics cost at TDC?
Labor is billed at an honest hourly rate: $125/hr for gas vehicles and $135/hr for diesel. You get the diagnosis and an estimate before any repair work starts — call (307) 996-0980 and Trevor will give you a straight answer about your vehicle.
Do you handle all diagnostics work in-house?
Yes — everything listed on this page is done in the shop by Trevor at 8407 Aztec Drive in Cheyenne. One mechanic, one standard of work, no hand-offs.
How do I get started?
Call (307) 996-0980 and describe the symptom or the work you want done. You'll talk directly to the mechanic — not a service writer — and get a straight answer about diagnosis, scheduling and cost.