P2003 — DPF Ash Accumulation Restriction
Seen on: Heavy Truck/Diesel
DPF Ash Accumulation Restriction. Common causes: Exceeded ash service interval.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Exceeded ash service interval
- High oil consumption
- extended oil change intervals
First moves (roadside)
- Check ash accumulation estimate
- schedule DPF cleaning or replacement
FAQ
DPF Ash Accumulation Restriction. Common causes: Exceeded ash service interval.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Exceeded ash service interval. Other possibilities include High oil consumption; extended oil change intervals.
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.