Powertrain Enriched, not yet reviewed Lights the check engine lamp

P2A40: Alternative Fuel System - Injector Leakage to Rail Detected

Standardized SAE J2012 code · P2Axx codes

What does P2A40 mean?

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.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Common causes

High Injector seat worn - leaks closed
Medium Injector seal aged - external leak path

Likelihood is a general estimate across vehicles; your make and model may differ.

Add your car to see reports of P2A40 on the same make and model first.

P2A40 in the community

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Describe your P2A40 problem

At a glance

System: Powertrain
Repair difficulty: Hard · Workshop recommended
Typical labour: 2–8 h
Typical cost: €400–€2,200
Emissions-related: Yes — may fail an emissions test
Limp mode: Possible — power may be reduced

Components involved

Alt fuel injectors
Alt fuel rail

Reading this code

Any generic OBD-II scanner reads standardized P2 codes from the engine module.

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Sources

The explanation was compiled from the cited sources but has not had an individual review yet.

Data: OBDex (CC0), revision 3eca5de.