Powertrain
generic / SAE
P2A9D
Alternative Fuel High Pressure System Small Leak
The AFCM detects a small leak in the high-pressure alternative fuel system based on pressure decay rate after engine shutdown. Common in CNG vehicles where seal aging causes slow gas loss.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / 9D
Possible causes
- Seal aged at fitting or valve high
- High-pressure fitting loose medium
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–1500 €
- Estimated time: 1–6 h
- Component: alt fuel high pressure lines
- Component: alt fuel seals
- Component: alt fuel tank
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012