Stuck On The Road? We Come To You.
Harry & Bonnie Heavy Duty Mechanic provides 24/7 mobile diesel road service and shop repair in Fontana, CA. Fast help for DPF, DOT issues, rebuilds, brakes, air leaks, overheating, trailers, and heavy-duty truck repair.
For faster service, have your location, truck type, warning lights, fault codes, and symptoms ready before calling.
Diesel repair built for drivers who cannot wait.
Roadside and shop service for heavy-duty trucks, trailers, fleets, and owner-operators.
24/7 Roadside Repair
Breakdowns, no-starts, air leaks, overheating, electrical problems, and urgent road calls.
DPF / DEF Systems
Derates, regen issues, clogged DPF, DEF faults, sensors, and emissions diagnostics.
DOT & Inspection Issues
Lights, brakes, trailer issues, scale problems, safety repairs, and inspection support.
Engine Repair & Rebuilds
Diesel diagnostics, rebuild work, cooling systems, injectors, overheating, and major repair.
Brakes & Air Systems
Brake chambers, valves, lines, low air pressure, brake adjustments, and heavy-duty brake work.
Transmission & Drivetrain
Clutch, transmission, differential, driveline, and powertrain diagnostics.
Simple steps when every minute matters.
Call or Text
Send your location, truck type, and issue.
Diagnose
We help figure out the likely problem and needed parts.
Dispatch
A mechanic comes out or you get scheduled at the shop.
Repair
We work to get the truck safe and back on the road.
Quick answers before you call.
Do you offer 24/7 mobile road service?
Yes. Call (909) 471-3283 for emergency diesel road service. Availability depends on location, parts, and current calls.
Can you help with DPF or DEF problems?
Yes. We help with derates, regen issues, DPF, DEF faults, sensors, and emissions-related diesel diagnostics.
Do you have a shop too?
Yes. The shop is located at 8358 Beech Ave, Fontana, CA 92335 for scheduled repairs and bigger jobs.
What should I send when texting?
Send your exact location, truck year/make/model, warning lights or codes, symptoms, and whether you are loaded or at a scale.
Harry & Bonnie Heavy Duty Mechanic
24/7 mobile diesel road service and shop repair based in Fontana, CA.
Stuck On The Road? We Come To You.
Harry & Bonnie Heavy Duty Mechanic provides 24/7 mobile diesel road service and shop repair in Fontana, CA. Fast help for DPF, DOT issues, rebuilds, brakes, air leaks, overheating, trailers, and heavy-duty truck repair.
Have your location, truck type, warning lights/codes, and symptoms ready.
Diesel repair built for drivers who cannot wait.
Roadside and shop service for heavy-duty trucks, trailers, fleets, and owner-operators.
24/7 Roadside Repair
Breakdowns, no-starts, air leaks, overheating, electrical problems, and urgent road calls.
DPF / DEF Systems
Derates, regen issues, clogged DPF, DEF faults, sensors, and emissions diagnostics.
DOT & Inspection Issues
Lights, brakes, trailer issues, scale problems, safety repairs, and inspection support.
Engine Repair & Rebuilds
Diesel diagnostics, rebuild work, cooling systems, injectors, overheating, and major repair.
Brakes & Air Systems
Brake chambers, valves, lines, low air pressure, brake adjustments, and heavy-duty brake work.
Transmission & Drivetrain
Clutch, transmission, differential, driveline, and powertrain diagnostics.
Simple steps when every minute matters.
Call or Text
Send your location, truck type, and issue.
Diagnose
We help figure out the likely problem and needed parts.
Dispatch
A mechanic comes out or you get scheduled at the shop.
Repair
We work to get the truck safe and back on the road.
Quick answers before you call.
Do you offer 24/7 mobile road service?
Yes. Call (909) 578-3348 for emergency diesel road service. Availability depends on location, parts, and current calls.
Can you help with DPF or DEF problems?
Yes. We help with derates, regen issues, DPF, DEF faults, sensors, and emissions-related diesel diagnostics.
Do you have a shop too?
Yes. The shop is located at 8359 Beech Ave, Fontana, CA 92335 for scheduled repairs and bigger jobs.
What should I send when texting?
Send your exact location, truck year/make/model, warning lights or codes, symptoms, and whether you are loaded or at a scale.
Harry & Bonnie Heavy Duty Mechanic
24/7 mobile diesel road service and shop repair based in Fontana, CA.