What it means
The controller has not learned or received the required high-pressure fuel pump calibration data. The code does not specify what default values or control behavior are used.
At a glance
- Usually lights the check-engine light
How it works
The high-pressure fuel pump supplies pressurized fuel to the injection system, and some systems require pump-specific calibration data in the control module. P268B means the required pump data has not been learned or programmed. This can leave pump control without the calibration expected after a replacement or interrupted programming session.
Common causes
Most likely first.
- Pump calibration codes not entered after replacement
- Programming session aborted before completion
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
How to diagnose it
- Scan for fuel-pressure and programming-related codes, then review freeze-frame data for long cranking, stalling, or power loss under load.
- Check service history to determine whether the high-pressure pump was replaced or a programming session was started but not completed.
- Inspect pump electrical connectors and wiring for loose connections or damage before attempting calibration.
- Compare the pump's identification and calibration information with the vehicle application and module requirements.
- Complete the manufacturer's pump calibration procedure, then verify commanded and actual fuel pressure data and confirm that the code does not return.
Common fixes
- Complete the interrupted pump calibration or programming session.
- Enter the correct calibration data for the installed high-pressure pump.
- Repair a loose or damaged pump connector or wiring connection.
- Install a compatible pump if the fitted unit does not match the required application.
Can I keep driving?
Avoid heavy acceleration, high engine speed, and towing; if it stalls, will not start, or loses power, stop driving and arrange recovery. Incorrect or missing pump calibration can contribute to hard starting, stalling under load, or loss of power.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.