Diesel Mechanic in Rohnert Park, CA
Sonoma County diesel pickup, work-truck, and fleet repair — ASE & ATRA certified technicians, since 1997.
305 Laguna Dr, Rohnert Park, CA 94928 • Early-bird drop-off available
Diesel mechanic near me — Sonoma County answer
If you searched diesel mechanic near me from Rohnert Park, Cotati, Petaluma, Santa Rosa, Sonoma, Sebastopol, Windsor, Novato, or anywhere in the North Bay, this is your nearest full-service diesel shop. Rohnert Park Transmission & Auto Repair has been diagnosing and repairing diesel pickups, work trucks, vans, and fleets at 305 Laguna Dr since 1997. Our technicians are ASE and ATRA certified, our shop is BBB A+ accredited, and we carry 201 five-star Google reviews.
We service every major light-duty and medium-duty diesel platform — Ford Power Stroke (6.0L, 6.4L, 6.7L), Chevy & GMC Duramax (LB7 → L5P), Ram Cummins (5.9L, 6.7L), Sprinter, EcoDiesel, and TDI — plus Allison 1000, Ford TorqShift, and 68RFE diesel transmissions. We work within California CARB rules: we keep your emissions equipment functional and legal, we don't delete or disable it.
Drop your diesel off — or let us pick it up
Early-bird drop-off Mon–Fri. Fleet concierge pickup and delivery so your truck never leaves the job site.
Open Mon-Thu 7:30am-5pm
Friday 7am-4pm
Diesel platforms we work on
Light-duty and medium-duty diesels common across Sonoma County ranches, jobsites, vineyards, and routes.
Ford Power Stroke
6.0L, 6.4L, 6.7L Power Stroke diagnostics, injector and HPOP work, EGR and turbo service on F-250 / F-350 / Super Duty trucks used across Sonoma County job sites and ranches.
Chevy / GMC Duramax
LB7 through L5P Duramax diagnosis, fuel system testing, Allison transmission service, and emissions work for Silverado HD and Sierra HD work trucks.
Ram Cummins
5.9L and 6.7L Cummins diagnostics on Ram 2500 / 3500 — turbo, fuel injection, lift pump, and 68RFE transmission service for towing and vineyard hauling.
Sprinter & Diesel Vans
Mercedes Sprinter and Promaster diesel service for plumbers, electricians, HVAC techs, and delivery routes that can't sit at a dealer for two weeks.
Light-Duty Diesel Cars & SUVs
Diesel VW TDI, Jeep Grand Cherokee EcoDiesel, and similar light-duty diesels — diagnostics, DEF, and routine service.
Diesel Fleets & Work Trucks
Vineyard ATVs and pickups, contractor service trucks, landscaping fleets, delivery vans — recurring preventive maintenance instead of breakdown repair.
Diesel services in one shop
Diesel-specific work the average auto repair shop punts to the dealer — handled here, in Rohnert Park.
Diesel Diagnostics
Low power, hard start, regen issues, P-codes, towing complaints — we read the truck on the scan tool first, then quote the work.
Fuel System Service
Diesel fuel filters, water-in-fuel issues, lift pump testing, injector and HPCR diagnostics — common on aging Power Stroke and Cummins trucks.
Turbo & Boost
Turbocharger inspection, VGT issues, intercooler and boost-leak testing — the source of most 'truck feels gutless' calls.
DPF & Emissions
DPF regen problems, EGR cooler symptoms, SCR / DEF faults — diagnosed and repaired to keep your diesel CARB-legal in California.
Diesel Transmission Service
Allison 1000, Ford TorqShift, and 68RFE service — fluid, filter, valve body, and rebuild work from ATRA-certified technicians.
Glow Plugs & Starting
No-start, hard-start, and rough cold-start diagnosis — glow plugs, glow plug controllers, batteries, and starter testing.
Built for Sonoma County's diesel reality
Sonoma County runs on diesel. Vineyard pickups during crush, construction service trucks between Petaluma and Healdsburg, delivery routes across Marin and Napa, ranches on rural Lake County roads. We've built our diesel program for the way local owners and fleets actually use these trucks.
Vineyards, Wineries & Ag
Diesel trucks moving fruit, irrigation pumps, and pesticide rigs through Sonoma, Napa, and Russian River AVAs depend on uptime through crush.
Construction & Trades
Diesel pickups, service trucks, and dump trucks hauling materials between Rohnert Park, Petaluma, Santa Rosa, and Marin County job sites.
Delivery, Logistics & Routes
Sprinter and box-truck routes can't afford a week-long dealer wait. We prioritize fleet vehicles so they get back on the road.
Diesel fleet customers get more
If you run two or more diesel work vehicles in Sonoma, Marin, Napa, or Lake County, our fleet program is built around uptime, not paperwork.
- Concierge pickup & delivery from your job site or yard
- Priority repairs — fleet trucks go to the front of the line
- Free comprehensive inspections on every visit
- Digital inspections with photos and 1-click approval
- 15% off parts for fleet partners
- Custom preventive-maintenance schedule by truck and duty cycle
Why Sonoma County diesel owners pick us
27+
Years serving Sonoma County
201
Five-star Google reviews
ASE
& ATRA certified technicians
A+
BBB accredited business
AMRA MAP Participating Facility — independent verification of honest repair practices.
Owner Fernando Gomez personally oversees diesel diagnostics and trains the shop's ASE-certified technicians.
Related services
Fleet Services
Concierge pickup, priority repairs, 15% off parts
Transmission Service
Allison, TorqShift, 68RFE diesel transmission work
Auto Diagnostics
Diesel scan-tool diagnostics and P-code analysis
Check Engine Light
Diesel CEL diagnosis, regen and emissions faults
Mechanic Rohnert Park
Full-service local mechanic shop hub
Auto Repair
All makes, models, and powertrains
Diesel mechanic questions, answered
The questions Sonoma County diesel owners actually ask before they hand us the keys.
Where can I find a diesel mechanic near me in Rohnert Park or Sonoma County?
Rohnert Park Transmission & Auto Repair at 305 Laguna Dr in Rohnert Park has been a Sonoma County diesel mechanic option since 1997. We service diesel pickups, work trucks, vans, and fleets across Rohnert Park, Cotati, Petaluma, Santa Rosa, Sonoma, Napa, and Marin County. Call (707) 584-7727 to schedule.
What do diesel mechanics charge per hour?
Diesel labor rates vary by region, shop overhead, and the complexity of the job. California diesel labor is typically higher than the national average because of cost of living, CARB emissions requirements, and specialty diagnostic tooling. We don't publish a flat shop rate online because diesel work depends on the specific truck, engine, and symptom. Call (707) 584-7727 for an accurate diesel estimate for your vehicle.
Why are diesel repairs more expensive than gas repairs?
Three reasons. First, diesel parts (high-pressure injectors, turbos, DPFs, glow plug controllers) cost more than their gasoline equivalents. Second, diesel diagnostics take longer — there are more sensors, more emissions logic, and more interaction between fuel, boost, and aftertreatment. Third, diesel-trained technicians are scarcer than general auto techs, so labor demand is higher. The trade-off: a properly maintained diesel pickup will run 300,000+ miles and tow loads no gas truck can match.
Do you work on Power Stroke, Cummins, and Duramax?
Yes. We diagnose and repair all three major light-duty / medium-duty diesel platforms: Ford 6.0L, 6.4L, and 6.7L Power Stroke; Chevy/GMC Duramax (LB7, LLY, LBZ, LMM, LML, L5P); and Ram Cummins 5.9L and 6.7L. We also service Sprinter, EcoDiesel, and TDI light-duty diesels.
Can you fix my diesel truck without sending it to the dealer?
For most diesel repair and diagnostic work — fuel system, turbo, transmission, EGR, DPF, glow plugs, sensors, electrical — yes. We use professional scan tools and follow factory diagnostic procedures, then back our work with a written warranty. The few situations that genuinely require the dealer are open factory recalls, in-warranty powertrain claims, or proprietary software updates. We'll tell you honestly when the dealer is the right call.
Do you handle California diesel emissions and CARB compliance?
Yes. We work within California CARB rules — we keep your diesel emissions equipment (DPF, EGR, SCR/DEF system) functional and legal. We diagnose check engine lights and regen faults, replace failed factory components with CARB-compliant parts, and document our work. We do not delete or disable emissions equipment — that's illegal in California and disqualifies trucks from registration and resale.
Do you service diesel fleets and work trucks?
Yes. Our fleet program is built for Sonoma County businesses running diesel pickups, vans, and work trucks: concierge pickup and delivery so your truck never leaves a job for the shop, priority repairs to minimize downtime, free comprehensive inspections, digital inspections with photos and one-click approval, 15% off parts for fleet partners, and a custom preventive-maintenance schedule. See our /fleet-services page or call (707) 584-7727 to start.
How often should a diesel truck be serviced?
Diesel pickups follow a different maintenance cadence than gas vehicles. Oil and filter changes are typically more frequent under load (towing, hauling, idling). Fuel filter intervals on Power Stroke, Duramax, and Cummins are shorter than people expect. Transmission fluid in Allison 1000 / TorqShift / 68RFE units should be serviced on a schedule based on duty cycle, not just mileage. Bring us your truck, tell us how you use it, and we'll build a maintenance plan around real-world use — not a generic 30/60/90.
Can I drop my diesel truck off before work?
Yes. We open at 7:30am Monday-Thursday and 7am Friday, with after-hours drop-off using our key drop box if you need to leave the truck the night before. Fleet customers can use our concierge pickup and delivery so the truck stays at your job site or yard until we're ready for it.
Talk to a real diesel mechanic — not a call center
305 Laguna Dr, Rohnert Park, CA 94928