P04A0
Exhaust Pressure Control Valve B Range or Performance
Same as P049F with feedback in plausible range yet not matching the engine model - actuator slow, slipping or position sensor offset.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Actuator slow due to sootCommon
- Gearing slippingPossible
Parts involved
- Exhaust Pressure Valve B
- Exhaust Pressure Actuator B
P04A0 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.