P268B code meaning
High Pressure Fuel Pump Calibration Not Learned/Programmed
Powertrain system Generic code P26xx codes Check engine light
What P268B means
Common rail and direct-injection gasoline 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.
P268B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P268B
- Check engine light on
- Long cranking or hard start
- Reduced power with rail pressure deviations
Common causes of P268B
- Most likelyPump correction data not entered after pump replacement
- PossibleController replaced or reflashed without transferring pump data
- Less likelyPump variant does not match the software
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
High pressure pumpControl module
What each part of P268B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| 8B | The exact fault in that area. |
What to do next
- Note P268B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P268B
What does P268B mean?
P268B means "High Pressure Fuel Pump Calibration Not Learned/Programmed". Common rail and direct-injection gasoline systems use a high pressure pump whose delivery is trimmed by a metering or volume control valve. It is a generic code, so it means the same on every make.
Is it safe to drive with P268B?
Drive gently and only to a workshop. With P268B the car can go into limp mode (reduced power) to protect itself.
Will P268B fail an emissions test?
Yes, it can. P268B is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P268B to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P268B clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.