P02E5Diesel Intake Air Flow A Control Stuck Closed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The diesel intake air flow valve A is the throttle flap ahead of the intake manifold of a diesel engine: it creates the vacuum needed for high EGR rates, lowers airflow to heat the particulate filter and catalyst during regeneration and closes at switch-off against run-on shaking. A spring holds it open when unpowered; an electric motor positions it, with a position sensor reporting back. P02E5 means the valve stays more closed than commanded or does not return to its open rest position when unpowered – more critical than stuck open, because the engine lacks air. GM sets it at over 8 % more closed than commanded with more than 80 % duty for about 4 s, or after switch-off when the unpowered valve stays below 90 % open, with the warning light in the first trip. Result: loss of power, black smoke, in extreme cases stalling.
- What you may notice
- Check engine light on at once
- Severe loss of power, limp mode
- Black smoke, poor starting or stalling
- Likely causes
- LikelyCoking or oil carbon holding the valve closed
- PossibleReturn spring broken
- PossibleGear blocked
- RareIcing
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.