OBD-II code · Powertrain (generic, extended)
P243A Particulate Filter Restriction Ash Accumulation Bank 2
The diesel particulate filter on bank 2 reports backpressure attributable to ash (non-combustible residue from oil and fuel additives, not removable by regeneration). The filter has reached the end of its service life and needs cleaning or replacement.
Is it safe to drive with P243A?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyDPF full of ash
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
- 3–8 h
- Emissions test
- Likely to fail
- Parts involved
- Dpf B2
Related codes
- P242FParticulate Filter Restriction Ash Accumulation Bank 1
- P2437AIR System Air Flow or Pressure Sensor Circuit Low Bank 2
- P2438AIR System Air Flow or Pressure Sensor Circuit High Bank 2
- P2439AIR System Air Flow or Pressure Sensor Circuit Intermittent or Erratic Bank 2
- P243BParticulate Filter Restriction Forced Limited Power Bank 2
- P243CParticulate Filter Regeneration Frequency Bank 2
- P243DParticulate Filter Regeneration Duration Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.