P2B97
Exhaust Pressure Control Valve A Position Exceeded Learning Limit
The required adaptation offset for the exhaust pressure control valve A position exceeds the calibrated learning window. Mechanical wear or sensor drift beyond compensation.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Valve mechanism worn at end-stopsCommon
- Position sensor reference driftedPossible
Parts involved
- Exhaust Pressure Control Valve A
- Exhaust Pressure Valve Position Sensor
P2B97 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.