Code result
P2A40
Alternative Fuel System - Injector Leakage to Rail Detected
High severity
What it means
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?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Injector seat worn - leaks closed
highOne of the most commonly reported causes for this code — check this first.
Injector seal aged - external leak path
mediumA plausible cause — test and verify before replacing parts.
Related help
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