P268B
High Pressure Fuel Pump Calibration Not Learned/Programmed
After high-pressure pump replacement the engine controller did not receive the pump-specific calibration data. Rail pressure regulation runs from default values.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Common causes
Ordered by how often each turns out to be the cause.
- Pump calibration codes not entered after replacementCommon
- Programming session aborted before completionPossible
Parts involved
- High Pressure Pump
- Control Module
P268B is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.