P02E1Diesel Intake Air Flow A Control Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- 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. P02E1 means the valve does not follow its target position – GM's diesels set it when target and actual position differ by more than 10 % for about 1.2 s with a steady target, after two trips. Usually soot from EGR and oil from crankcase ventilation make it stiff, or the gear or motor is worn. On a fault the valve is switched off and the spring opens it: driving is usually little affected, but EGR control is restricted and filter regeneration may be blocked.
- What you may notice
- Check engine light on
- Often no noticeable change
- Filter regeneration does not run, soot load rises
- Shaking at switch-off
- Likely causes
- LikelyCoking from EGR soot and crankcase oil on flap and shaft
- PossibleValve gear or motor worn
- RarePosition sensor inaccurate
- RareIcing in cold weather
- 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.