P06FECold Start Diesel Intake Air Flow Control Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 'Diesel intake air flow control' is the diesel's electric intake throttle with position sensor (P02E0 ff). During cold start many diesels close it partly: the extra load raises exhaust temperature so the catalysts light off sooner. CARB requires such cold start elements to be monitored, with their own codes separate from normal operation. P06FE means the throttle does not reach its target position while the cold start strategy is active – it is not the intake air heater. No manufacturer document available to us uses P06FE: GM's 2025 diesels run this check under P2957 (deviation above 16 % or 10 %, two trips), Ford's 2023 diesels under P02E4 in cold start mode. Cold start emissions rise; driveability usually stays normal.
- What you may notice
- Check engine light, usually after two trips
- Hardly any change in driveability
- Possibly more smoke or smell while warming up
- Further throttle codes (P02E1/P02E4/P02E5) possible
- Likely causes
- LikelyIntake throttle coked with soot and oil (EGR, crankcase ventilation)
- PossibleThrottle motor or gear stiff, position sensor faulty
- RareIce or condensate in the intake in frost
- RareContact resistance in connector or wiring, low voltage
- 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: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.