P2D11
Exhaust Flow Control Valve A Position Not Learned
The ECM has not learned the end-stop calibration for exhaust flow control valve A. Position cannot be commanded with full precision until adaptation completes.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Adaptation lost after battery disconnect or ECM resetCommon
- Valve replaced without learn procedurePossible
Parts involved
- Exhaust Flow Control Valve A
- ECM
P2D11 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.