OBD-II code · Powertrain (generic, extended)
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).
Is it safe to drive with P24A1?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyDPF runaway exotherm
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–8 h
- Emissions test
- Likely to fail
- Parts involved
- Dpf B1
Related codes
- P249EClosed Loop Reductant Injection Control At Limit Flow Too High
- P249FExcessive Time To Enter Closed Loop Particulate Filter Regeneration Control
- P24A0Closed Loop Particulate Filter Regeneration Control At Limit Temperature Too Low
- P24A2Particulate Filter Regeneration Incomplete Bank 1
- P24A3Particulate Filter Restriction Soot Accumulation Bank 2
- P24A4Particulate Filter Restriction Soot Accumulation Too High Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.