Diesel Truck Repair in Modesto, CA
Central Valley diesel trucks work hard. Towing trailers, hauling loads, running long distances. Auto Alternatives is Modesto’s independent diesel truck specialist — Duramax, Power Stroke, Cummins. Dealership-level diesel expertise at half the dealership price.
📞 Repair & Mechanic: (209) 424-7905
📞 Body Shop & Collision: (209) 988-9824
Why Central Valley Diesel Owners Come to Us
- All three major diesel platforms serviced — GM Duramax, Ford Power Stroke, Ram Cummins
- Half the dealership price on the same repair
- Same-week appointments — don’t lose your truck for weeks
- Free diagnostics including advanced diesel scan tools
- Warranty stays intact — federal law protects your right to use an independent shop
- Fleet accounts welcome — priority scheduling and volume pricing
Diesel Services We Provide
GM Duramax (LB7, LLY, LBZ, LMM, LML, L5P)
All generations of Duramax from 2001 to today. Injector service, DPF regeneration and cleaning, emissions system diagnostics, and Allison transmission service.
Ford Power Stroke (7.3, 6.0, 6.4, 6.7)
Every Power Stroke generation. HPOP and HEUI injector service on 6.0. CP4 pump issues on 6.7. DPF service. Turbo repair.
Ram Cummins (5.9, 6.7)
Legendary Cummins engines. Injector service, DEF system service, DPF regeneration, and turbo work.
Common Diesel Truck Repairs
- Injector replacement (all platforms — most common major repair)
- DPF regeneration or cleaning — resolves regen issues and improves fuel economy
- Turbo replacement
- Fuel pump replacement (especially CP4 on 6.7 Power Stroke)
- EGR cooler service
- Head gasket repair (6.0 Power Stroke, older Duramax)
- DEF system service and diagnostics
- Glow plug replacement
- Allison, 6R140, and 68RFE transmission service
Emissions Compliance
California diesel emissions rules are among the strictest in the country. We keep your truck legal and running clean:
- DPF regeneration when regens are failing
- DPF cleaning or replacement
- DEF system diagnostics and repair
- EGR system service
- Emissions-related check engine code diagnosis
Note: We do not perform emissions deletes. California DMV smog requirements apply to diesel trucks and deletes are illegal to operate on public roads. If you have a truck with existing deletes, we can help bring it back to compliance.
Fleet Diesel Service
If you run a fleet of diesel trucks in the Central Valley — construction, agriculture, landscaping, logistics — we offer:
- Priority scheduling
- Volume pricing
- One point of contact for the entire fleet
- Consolidated monthly billing
- Preventive maintenance programs to minimize downtime
Frequently Asked Questions
Do you service 6.0 Power Stroke trucks?
Yes. The 6.0 has known issues (head bolts, HPOP, injectors) that require specific expertise. We handle all of them including full bulletproofing work.
Can you cure my Duramax injector problems?
Yes. All Duramax generations. We diagnose whether it’s an injector, injection pump, fuel supply, or other issue — and quote accordingly.
Do you work on Cummins-swapped trucks or performance builds?
We service factory Cummins engines fully. For heavily modified performance builds, call us and describe your setup — we’ll tell you honestly whether we can help.
Do you tune diesel trucks?
We don’t perform emissions-related tuning that isn’t CARB-legal for California. For street-legal performance improvements, we can install CARB-legal parts and tunes.
Do you offer diesel oil changes?
Yes. Full-service diesel oil changes with the correct oil for your engine (typically 15W-40 for older Duramax, 5W-40 for newer, 15W-40 or 5W-40 for Power Stroke depending on year, and 15W-40 for Cummins). Free multi-point inspection with every oil change.
Modesto’s Trusted Diesel Truck Shop
Duramax, Power Stroke, Cummins — all serviced. Same-week appointments. Fleet accounts welcome. Half the dealership price.
📞 Repair & Mechanic: (209) 424-7905
📞 Body Shop & Collision: (209) 988-9824
📍 442 Galaxy Way, Modesto, CA 95356 (Repair) · 623 Bangs Ave, Modesto, CA 95356 (Body Shop)
Also see our Ford and Chevy/GMC pages for gas-engine truck service.