OBD-II code · Powertrain (generic, extended)
P2A40 Alternative Fuel System - Injector Leakage to Rail Detected
The AFCM detects pressure decay in the alternative fuel rail consistent with injector leakage. Even with all injectors commanded closed, fuel flows back into the rail.
Is it safe to drive with P2A40?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyInjector seat worn - leaks closed
- PossibleInjector seal aged - external leak path
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–8 h
- Emissions test
- Likely to fail
- Parts involved
- Alt Fuel Injectors, Alt Fuel Rail
Related codes
- P2A3DO2 Sensor Negative Current Control Circuit High Bank 1 Sensor 3
- P2A3EAlternative Fuel Delivery Error
- P2A3FExcessive Time to Enter Alternative Fuel Control
- P2A41Alternative Fuel Tank B Pressure Sensor Circuit
- P2A42Alternative Fuel Tank B Pressure Sensor Range/Performance
- P2A43Alternative Fuel Tank B Pressure Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.