P243C
Particulate Filter Regeneration Frequency Bank 2
The DPF on bank 2 needs regeneration more often than calibrated. Possible causes are an oil-burning engine, fuel-injector leak, short-trip operation, or a sensor offset.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
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.
- Short-trip operationCommon
Parts involved
- DPF B2
- Fuel Injectors
P243C 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.