P2DD8Cold Start Fuel Injection Quantity B 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
- P2DD8 means path B delivered more fuel than requested while the cold-start routine ran. A cold engine burns surplus fuel poorly, so it leaves as white or blue smoke and raw hydrocarbons before the catalyst is warm, and some of it can reach the oil. No manufacturer uses P2DD8 in public documents. Ford shows how such an excess is caught on its 6.7 litre diesel: a cold-start version of the fuel balancing check runs only in cold start mode and sets a fault when an injector correction exceeds 90 percent of its allowed authority, but it reports through the cylinder codes P0263 and up. A leaking injector, a pressure regulator overshooting in the cold or a wrong temperature signal are the usual suspects. P2DD7 is the shortfall.
- What you may notice
- Check engine light on after a cold start
- White or blue smoke and fuel smell after a cold start
- Rising oil level from fuel dilution
- Likely causes
- LikelyInjector of group B leaking or sticking slightly open
- PossiblePressure regulation overshooting when cold
- PossibleCoolant temperature signal reads colder than real, too much start fuel
- RareCold-start calibration in engine control software
- 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: €80 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.