Diesel Engine Repair & Diagnostics in Terre Haute, IN
Check engine light, derate, low power, smoke or hard starts? We find the cause with computer diagnostics and repair heavy-duty diesel engines and transmissions in our shop on N 13th St.
- Computer Diagnostics
- Derates & Codes
- Engine & Transmission
- All Major Diesels
Diesel Repair Starts With Finding the Real Problem
Modern diesels run on sensors and computers, and one bad sensor can put a truck in derate as fast as a failed part. Swapping parts until the light goes off gets expensive. We connect to the engine and aftertreatment controls, read fault codes and live data, and test what the codes point to before we recommend a repair. Then we call you with what we found and what it costs. Nothing gets replaced until you say so.
Diesel Engine Problems We Repair
- Check engine lights, derates and limp mode
- Hard starts, no-starts and loss of power
- Black, white or blue smoke
- Overheating, coolant loss and oil in the coolant
- Injectors and fuel system problems
- Turbochargers and boost leaks
- EGR valves and coolers
- DPF, DEF and SCR aftertreatment faults
- Sensors, harnesses and wiring
- Major engine repairs and overhauls
Engines and Drivetrains
We work on Cummins, Detroit, PACCAR, Volvo and Mack engines, plus older diesels still earning their keep. Beyond diagnostics, we handle the heavy work: head gaskets, injector and turbo replacement, in-frame repairs and overhauls, and transmission and clutch work on manual and automated transmissions. For brakes, suspension and everyday maintenance, see semi truck repair. Filters, sensors and gaskets usually come off our own parts counter.
Our Diesel Repair Process
Read the Codes
We pull active and stored codes and look at live engine data.
Test & Inspect
We test the sensors, wiring and parts the codes point to.
Explain & Quote
You hear what failed, why, and what the fix costs.
Repair & Verify
We repair it, clear codes, run a regen if needed and road test.
We work Terre Haute (including the south side and downtown), West Terre Haute, Seelyville, Brazil, Clinton, Rockville, Paris and Marshall, Illinois, and the I-70 and US-41 corridors. See our service area.
Diesel Repair FAQs
What happens during a diesel diagnostic?
We connect to the engine and aftertreatment computers, pull active and stored codes, look at live data, then test the parts those codes point to. You get a clear answer before any parts are replaced.
My truck is in derate. Can you fix it?
Usually, yes. Derates most often come from aftertreatment faults, sensors or wiring. We find the cause, repair it, clear the codes and run a regen if needed.
Which diesel engines do you work on?
Cummins, Detroit, PACCAR, Volvo and Mack engines, plus older diesels still running in trucks around the area.
Do you repair transmissions?
Yes. Clutches, manual transmissions and automated manual transmissions, along with driveshafts and U-joints.
Can you diagnose my truck on the road?
Yes. Our roadside technicians carry diagnostic equipment, so we can often fix the problem where you're stopped.
Engine Light On?
Call and we'll get your truck diagnosed.