Diesel Chassis Repair
Freightliner and Spartan motorhome chassis, serviced where the coach is parked.
The Work
What we do
Diesel motorhomes fall between two stools: RV dealers look after the house and won't touch the chassis, and truck shops aren't set up for a forty-foot coach. We work the chassis side — Cummins power on Freightliner and Spartan frames — without the coach ever going to a dealer.
- Freightliner and Spartan chassis (we do not work on light-duty pickups)
- Cummins ISB, ISL and ISX diagnostics, derate codes and turbo faults
- Allison transmission faults read on site
- Air brakes, air bags, height control valves and air dryers
- DPF, DEF and regens that never complete
Sound Familiar?
Signs you need this.
- Dash warning light, a countdown message, or the coach suddenly limited to a low speed
- Lost power climbing a grade
- The coach kneels or sits off level overnight
- Air pressure won't build, or the brakes drag
- Regen keeps starting but never seems to finish
Any of these and it’s worth a call — (385) 476-1380. We come to you.
Common Questions
Straight answers.
- Do you work on Power Stroke or Duramax pickups?
- No. We work Freightliner and Spartan motorhome chassis only. Light-duty pickups, semis and heavy equipment are outside what we do.
- Why won't my RV dealer touch the chassis?
- Most RV dealers are set up for the house side — plumbing, appliances, slide-outs — and send chassis work away. Truck shops can do the mechanical side but often can't physically take a forty-foot coach. That gap is the reason this service exists.
- What causes a derate on a diesel motorhome?
- Usually the aftertreatment system. Coaches idle a lot, sit for months and run short trips at low load, which is exactly the duty cycle that stops a regen completing. Once the system decides it can't clean itself, it starts limiting power. We run a forced regen on site and fix the underlying cause so it doesn't come straight back.
- Can you do this at my storage lot?
- Yes. Our service trucks carry dealership-level diagnostics, so the coach stays where it is.
Where
Diesel Chassis Repair across northern Utah.
We cover Utah County, Wasatch County, Summit County and Salt Lake County — from Spanish Fork out to Heber City, Park City and up the valley into Salt Lake. We also run seasonal winter service trips to the Phoenix East Valley.
Also From Blue Summit
Other services.
Electrical & Solar
12V and 120V house power, inverters, battery banks and solar installs.
Read more →Plumbing
Fresh water pumps, PEX leaks, water heaters and holding tanks.
Read more →HVAC
Rooftop air conditioners, furnaces and ducting, diagnosed on site.
Read more →Generators
Onan and coach generator service, diagnostics and repair.
Read more →Roof Repairs
Reseals, vent and skylight replacement, and membrane repair.
Read more →Trailer Repairs
Brakes, bearings, axles and suspension on travel trailers and fifth wheels.
Read more →Winterization & Spring Prep
Mobile winterizing before the freeze, de-winterizing before the season.
Read more →