Powertrain
generic / SAE
P2AA2
Alternative Fuel Return Line Insufficient Flow
The AFCM detects that the flow through the alternative fuel return line is below the expected minimum for the active operating mode. Restricted line, stuck valve, or pump output too low.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / A2
Possible causes
- Return line restricted by debris high
- Return line valve stuck closed medium
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 150–700 €
- Estimated time: 1–4 h
- Component: alt fuel return line
- Component: alt fuel return line valve
- Component: alt fuel pump
- MIL / check engine light
- emissions-relevant
- limp mode possible
Sources
References
sae:J2012