DEF and Regen Problem Repair in Arizona
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 Arizona, the directory lists 21 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. 9 list 24/7 service and 8 are mobile services. Pick the town closest to the truck.
Towns in Arizona
| Town | Providers in range | List 24/7 |
|---|---|---|
| Phoenix | 8 | 3 |
| Tucson | 5 | 4 |
| Flagstaff | 3 | 2 |
| Queen Creek | 3 | 0 |
Where the providers are
Towns with the most of these providers: Tucson (5), Flagstaff (3), Phoenix (2), Goodyear (1), San Simon (1), Glendale (1), Prescott (1), Chandler (1), Tempe (1), Kingman (1), Douglas (1), Holbrook (1), Mesa (1), Avondale (1). Interstates with these providers within 5 miles: I-10 (10), I-40 (5), I-17 (4), I-19 (3).
Providers in Tucson
Guzman's Diesel Road Service
Diesel Chaser Truck Inc
R and R Diesel Services LLC
DieselPro LLC
Cummins Sales and Service
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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