P24A1
Closed Loop Particulate Filter Regeneration Control At Limit Temperature Too High
Same as P24A0 with the controller fully reducing heat input yet EGT still rising - typical for a runaway exotherm in the DPF (oil contamination).
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Common causes
Ordered by how often each turns out to be the cause.
- DPF runaway exothermCommon
Parts involved
- DPF B1
P24A1 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.