DEF and Regen Problem Repair in California
The All Roadside Assistance answer: A DEF warning or a regen that will not finish can put the truck into derate. Call a diesel mechanic that works on aftertreatment systems, and read them the warning lights and codes.
Across California, the directory lists 278 providers with a phone number of the kinds that take calls for a DEF or regen problem: truck repair shops and mobile mechanics that mention diesel or aftertreatment work. 6 list 24/7 service and 14 are mobile services. Pick the town closest to the truck.
Towns in California
| Town | Providers in range | List 24/7 |
|---|---|---|
| San Ramon | 39 | 1 |
| Hayward | 37 | 1 |
| Pomona | 36 | 0 |
| San Leandro | 35 | 1 |
| Fullerton | 34 | 0 |
| Anaheim | 32 | 0 |
| Corona | 32 | 0 |
| Ontario | 32 | 1 |
| Walnut Creek | 32 | 1 |
| Redwood City | 31 | 1 |
| San Mateo | 31 | 1 |
| Palmdale | 30 | 1 |
| Fremont | 29 | 1 |
| Oakland | 29 | 1 |
| Palo Alto | 28 | 1 |
| Santa Ana | 28 | 0 |
| Antioch | 27 | 1 |
| Daly City | 27 | 1 |
| Brentwood | 26 | 1 |
| El Monte | 26 | 0 |
| Stockton | 26 | 1 |
| Modesto | 25 | 1 |
| Long Beach | 23 | 0 |
| Riverside | 23 | 1 |
| Lodi | 22 | 0 |
| Turlock | 22 | 1 |
| Victorville | 22 | 1 |
| Los Angeles | 21 | 0 |
| Moreno Valley | 21 | 0 |
| Tracy | 21 | 0 |
| Lake Elsinore | 20 | 0 |
| Vallejo | 19 | 1 |
| Fairfield | 18 | 0 |
| San Jose | 16 | 0 |
| Vacaville | 15 | 0 |
| Davis | 13 | 0 |
| Merced | 13 | 0 |
| Sacramento | 13 | 0 |
| Fresno | 12 | 0 |
| Roseville | 11 | 0 |
| Visalia | 10 | 0 |
| Hemet | 9 | 0 |
| Lancaster | 9 | 1 |
| Madera | 9 | 0 |
| Yuba City | 8 | 0 |
| Bakersfield | 7 | 1 |
| Escondido | 7 | 1 |
| Delano | 6 | 0 |
| Murrieta | 6 | 0 |
| Chico | 5 | 0 |
| Santa Rosa | 5 | 0 |
| Indio | 4 | 0 |
| Redding | 4 | 0 |
| Salinas | 4 | 0 |
| Oxnard | 3 | 0 |
| San Diego | 3 | 1 |
| Santa Maria | 3 | 0 |
Where the providers are
Towns with the most of these providers: Fontana (7), Eureka (2), Hayward (2), Hesperia (2), Brawley (2), Turlock (2), Redding (2), Vacaville (2), Modesto (2), Santa Maria (2), Stockton (2), San Leandro (1), El Cajon (1), San Jose (1), Waterford (1). Interstates with these providers within 5 miles: I-5 (34), I-10 (21), I-80 (20), I-15 (15), I-8 (2), I-40 (1).
Providers in Fontana
Inland Diesel Repair
Reliable Diesel Truck & Trailer Repair
Arce Diesel Truck & Trailer Repair
Inland Mobile Diesel
I10 Diesel
D & L Diesel Truck Repair
First steps
- Read the warning lights and any fault codes on the dash.
- Check the DEF level and whether the DEF looks clean.
- If the truck asks for a parked regen and it is safe, follow the steps in your manual.
- Plan the nearest safe stop if the truck starts to lose power.
What to tell the provider
The truck make, model and engine, the warning lights and codes, whether the truck is in derate, and when the last regen ran.
Why it happens
DEF and regen problems include a clogged DPF, a failed DEF sensor or pump, bad DEF, a stuck EGR valve and wiring faults. Many need a diagnostic tool. Listings that mention DEF, DPF or aftertreatment work are marked on this page.
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