Twin Falls runs on Cummins power — Ram one-tons pulling stock trailers, dairy and farm trucks loaded down all season, hot shots, and work rigs that never really get a day off. When one of them drops a fuel pump or throws a derate code right in the middle of hauling season, you don't want a dealership wait or a dealership bill. You want a shop that knows Cummins repair inside and out and is close by. We're about ten minutes from Twin Falls, straight up US-93 in Jerome, and Cummins work fills our bays every single week.
Cummins engines we service
- 5.9L 12-valve and 24-valve — VP44 pumps, injectors, and lift-pump trouble.
- 6.7L common-rail — injectors, CP3/CP4 high-pressure pumps, and fuel supply.
- ISX and heavier Cummins in work trucks, hot shots, and RVs.
- Turbochargers, VGT/variable-vane actuators, and boost-leak diagnosis.
- EGR coolers and valves, DPF regen faults, and DEF dosing/sensor failures.
- Grid heaters, batteries, cables, and cold-start no-starts.
- Head studs, head gaskets, cooling systems, and full engine work.
Built for Magic Valley work trucks
Cummins trucks out here earn their keep — heavy loads up the Hansen grade, long idles in the field, dusty section roads, and brutal cold mornings. That kind of duty is exactly what cooks injectors, plugs a DPF, strains a CP3, and gels fuel. We diagnose with scan tools that actually talk to the Cummins control modules, not just generic OBD-II, so you get the real cause the first time instead of a parts cannon. On the older 5.9 trucks we watch lift-pump and fuel pressure closely, because starving a VP44 or CP3 is what takes them out — fixing that protects the expensive pump downstream. Heavier and commercial work flows into our semi & heavy-duty and fleet service programs, and roadside or derate calls go to our 24/7 towing.
Regen, DEF, and derate — done the legal way
The 6.7 Cummins is sensitive about its aftertreatment, and constant regens, a plugged DPF, a failed DEF quality or dosing sensor, or a NOx sensor fault will put the truck into derate right when you need it loaded and moving. We track those faults to the actual failed component and repair the system so it stays compliant and stays out of limp mode — not a quick code-clear that comes right back. Same goes for EGR coolers and valves that crack, clog, or leak coolant and trigger a chain of codes.
Close, honest, and open 7 days
We're open 7 AM to 10 PM every day, give written estimates before we start, and we finish jobs other shops won't touch. If you're off Pole Line or Blue Lakes in Twin Falls and your Cummins is down or in derate, see our full diesel repair services, our broader Twin Falls diesel page, or our Twin Falls service area, then call (208) 696-9888.
Frequently Asked Questions
Do I really have to drive to Jerome for Cummins work?
It's about a 10-minute run up US-93 from Twin Falls to our Jerome shop, and a lot of Twin Falls trucks make that trip on purpose — real Cummins diagnostics, injectors, fuel systems, and aftertreatment without dealership prices or a week-long wait. If your truck is in derate or won't move, our towing can bring it to us instead.
My 6.7 keeps going into regen or throwing a DPF/DEF code — can you fix it?
Yes, and this is one of the most common Cummins jobs we see on Magic Valley farm and dairy trucks. Constant regens, plugged DPFs, failed DEF dosing and quality sensors, NOx sensor faults, and limp-mode derate usually trace back to a specific root cause — we diagnose it and repair it the legal way so the truck stays compliant and out of derate, not just clear the code so it comes back next week.
Do you work on the older 5.9 Cummins fuel systems — VP44 and injectors?
All the time. The 24-valve 5.9 VP44 injection pump, dead-pedal and stalling complaints, worn injectors on the common-rail trucks, and the CP3 high-pressure pump are bread-and-butter for us. We also strongly recommend a healthy lift pump and fuel pressure on these trucks, because starving the VP44 or CP3 is what kills them in the first place.
Can you handle ISX and bigger Cummins in my work truck or RV?
Yes. We work the ISX and other heavier Cummins found in hot shots, RVs, and work trucks — EGR coolers and valves, turbo actuators and VGT problems, DPF/DEF aftertreatment, and electrical and sensor faults. Heavier commercial units flow into our semi and fleet programs so the whole truck gets handled in one place.
My Cummins won't start when it's cold — is that the grid heater?
Often, yes. The 6.7 and 5.9 use an intake grid heater instead of glow plugs, and a failed grid heater relay or element, weak batteries and cables, or gelled fuel all cause hard cold-morning starts down here. We test the whole cold-start path — grid heater, batteries, lift pump, and fuel — and fix the actual cause so you get a reliable start on the worst Idaho mornings.
Ready to get on the schedule?
Call us, book online, or stop by the shop in Jerome.