P24A0
Closed Loop Particulate Filter Regeneration Control At Limit Temperature Too Low
With regeneration running closed-loop the controller is at maximum heat-input demand yet cannot raise EGT to setpoint - typical for a load-poor drive cycle.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
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.
- Drive cycle load too lowCommon
Parts involved
- DPF B1
P24A0 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.