P2C52Cylinder 1 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
- Engines with two injectors per cylinder call the second one injector B; with port plus direct injection that is usually one of the two sets, but which one is the maker's choice. For every B injector the engine control learns an offset, a correction for the dead time between the electrical command and the start of real fuel flow. P2C52 says this correction for cylinder 1 has been pushed to its lowest permitted value: the injector already passes more fuel than its model expects, and the pulse cannot be shortened any further. CARB 13 CCR 1968.2 (e)(6.2.2) counts an adaptation that has used up its authority as a malfunction. No manufacturer publishes this exact code; Volvo's Technical Journal 36016 names only the Max partner P2C53.
- What you may notice
- Check engine light
- Often nothing else noticeable
- Long hot start or rough first seconds, possibly misfire on cylinder 1
- Possibly fuel smell or higher consumption
- Likely causes
- LikelyInjector B of cylinder 1 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.