Collection
Where it applies, we arrange collection of your equipment or component at no charge.
24-Hour Rush Repair
Fontana, CA · Independent Cummins service
Cummins Engine Repair in Fontana
More working iron in this region wears Cummins power than any other badge — the ISB and 6.7L in pickups and medium-duty trucks, the ISC and ISL in vocational trucks, the ISX and X15 in Class 8 tractors, and the QSB and QSC in equipment. Our Fontana shop repairs and rebuilds Cummins diesels in trucks and machines alike: in-frame rebuilds, cylinder heads, turbos, injectors, and the aftertreatment systems behind most modern downtime. We are an independent shop — Cummins engine specialists, without the dealer queue.
Fontana, CA · Independent Cummins service
The Cummins jobs that fill our week
In-frame and out-of-frame rebuilds with all machining in-house; cylinder head and head gasket jobs; high-pressure fuel systems and injector replacement; turbocharger diagnosis and replacement; DPF, DOC and SCR aftertreatment diagnosis — forced regens that refuse to complete, derate faults, and NOx sensor and DEF system failures, each traced back to its cause; and diagnosis of cooling problems, oil consumption and blow-by carried out with measurements rather than guesses.
Makes we work onCummins
Cummins Engine Repair in Fontana · Fontana, CASerious rebuild depth behind every Cummins job
An engine shop makes its name on the difficult jobs: the in-frame carried out with the block measured, the derate traced beyond the sensor it was blaming. That is the work that happens here, with machining and gear manufacturing in the same building — documented on photos and video, and priced in writing before it starts. Pick-up and delivery are free when applicable; hours run Monday–Friday 6 AM–5 PM, and the 24-hour rush line operates every day of the year.
- In-frame rebuild work — ISB, ISC, ISL, ISX and X15
- Aftertreatment work: DPF, SCR, DEF and derate faults
- Injectors, turbos and high-pressure fuel system work
- Jobs on cylinder heads and head gaskets
- Cummins power in equipment — QSB, QSC and QSL
How a repair moves through our shop — eight steps
From your first phone call through final testing, this is the route every job follows before it goes back into service.
Inspection
We take the unit apart and assess the full extent of the failure.
Photo & video record
Condition and findings get recorded, so the repair conversation stays clear and honest.
Written quote
The work we recommend gets defined and priced before anything proceeds.
Your approval
Scope, urgency and the sensible way forward get confirmed with you.
Making & rebuilding
Components get machined, welded, rebuilt or reverse-engineered as the job requires.
Testing
Operation and workmanship are verified before anything is released.
Return
The finished component or machine goes back into service with you.
Questions customers ask us
Are you a Cummins dealership or distributor?
No — ours is an independent repair shop, and Cummins diesel engines are a specialty among the brands we service. No affiliation is implied.
My truck derates over and over — can you find what is really causing it?
Yes. A derate is a symptom, not a diagnosis: we work through the aftertreatment and sensor chain end to end and show you the readings, rather than swapping out whatever part the code happens to name.
Do you rebuild Cummins engines, or only repair them?
Both — everything from top-end and in-frame rebuilds through complete out-of-frame overhauls, with machining handled in-house.
More services from our shop
Truck down right now? Reach the around-the-clock rush line.
(949) 400-2937Book a service visit or start a repair order
Ask for a service visit.
Tell us the make and model, what the truck is doing, where it sits, how urgent it is, and when you would like us there. The form opens everything as a text message to John, so you can check it over before you hit send.