P2DDFFuel Injection Quantity D 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
- P2DDF says injection path D sends more fuel than the engine control asked for. The estimate behind it depends heavily on the air side: if the airflow meter reports too little air, or the NOx or oxygen sensor shows a richer lambda than real, the module sees a surplus that the injectors never delivered, so sensors deserve a check before injectors are replaced. GM also weights its limits with ambient pressure, so altitude alone should not trip the test. Ford's diesels judge the global error over 15 percent rich as P0172, with coolant between 70 and 120 °C. No manufacturer documents P2DDF itself. Excess fuel in D means soot, smoke and, on diesels, faster filter loading; P2DDE is the shortfall.
- What you may notice
- Check engine light on
- Black smoke, particulate filter loading faster
- Fuel consumption up
- Likely causes
- LikelyAirflow, NOx or oxygen sensor reading wrong
- PossibleInjector of group D leaking or nozzle eroded
- PossibleBoost or intake leak after the airflow meter
- 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.