P2C56Cylinder 3 Fuel Injector B Offset Learning At Min Limit
- 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
- P2C56 is set once injector B of cylinder 3 has its learned offset stuck at the minimum. How such a value is learned is shown in Ford patents for engines that combine both injection types: with the lift pump switched off, the port injectors fire one cylinder at a time while the others run on direct injection, and how far the low-pressure rail sags after every pulse shows how much fuel that injector really released. If cylinder 3 keeps releasing more than expected, the correction moves down until it reaches the floor. Typical sources are a leaking seat or an internal leak that adds fuel between pulses. No manufacturer documents this code publicly; it also exists on three-cylinder engines. CARB 1968.2 (e)(6.2.2) makes an exhausted adaptation a fault.
- What you may notice
- Check engine light
- Often nothing else noticeable
- Long hot start or rough first seconds, possibly misfire on cylinder 3
- Possibly fuel smell or higher consumption
- Likely causes
- LikelyInjector B of cylinder 3 leaking at the seat and adding fuel after closing
- PossibleReplacement injector of a different flow rating or not matched to the engine software
- PossibleLearned values or engine software not up to date (Volvo pairs an update with an adaptation reset for the related Max codes)
- RareSupply pressure on this injector set higher than the model assumes (regulator)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.