Powertrain
generic / SAE
P2D12
Exhaust Flow Control Valve B Position Not Learned
The ECM has not learned the end-stop calibration for exhaust flow control valve B. Position cannot be commanded with full precision until adaptation completes.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberD / 12
Possible causes
- Adaptation lost after battery disconnect or ECM reset high
- Valve replaced without learn procedure medium
Inspection / repair
- Difficulty: easy
- DIY: shop recommended
- Estimated cost: 50–250 €
- Estimated time: 0.3–1.5 h
- Component: exhaust flow control valve b
- Component: ecm
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012