P268BHigh Pressure Fuel Pump Calibration Not Learned/Programmed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Common rail and direct-injection petrol systems use a high pressure pump whose delivery is trimmed by a metering or volume control valve. Where the pump comes with individual correction data, or the controller has to learn its behaviour, P268B reports that this data is missing or was never taught. No manufacturer documents P268B publicly; GM's diesel tables, which carry P268A and the per-cylinder injector codes, do not list it. CARB names pumps corrected by in-line resistors as an example of parts whose compensation must be checked from 2015 on. Rail pressure control may then work with a generic pump model, so pressure faults such as P0087 or P0088 and weak starting can follow.
- What you may notice
- Check engine light on
- Long cranking or hard start
- Reduced power with rail pressure deviations
- Likely causes
- LikelyPump correction data not entered after pump replacement
- PossibleController replaced or reflashed without transferring pump data
- RarePump variant does not match the software
- 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: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.