P2DDDFuel Injection Quantity C Higher Than Expected
- 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
- P2DDD flags excess fuel from injection path C: the quantity really burned, as estimated from airflow and lambda, sits above the request. Besides the classic leaking injector, a possible trigger after repairs is a replacement injector whose individual flow code was not programmed into the engine control, so the module calculates with the wrong flow curve. Another is an EGR valve that leaves too little fresh air, which the estimate can read as surplus fuel. GM lets its system-A adaptation take away only about 8 to 14 mm³, depending on speed and load. No manufacturer documents P2DDD publicly. P2DDC is the shortfall in path C, P2DE1 the cold-start excess; smoke and higher consumption are what drivers notice.
- What you may notice
- Check engine light on
- Dark smoke under load
- Higher fuel consumption
- Likely causes
- LikelyInjector of group C leaking or nozzle worn
- PossibleInjector correction code not programmed after replacement
- PossibleEGR valve not closing fully, too little fresh air
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.