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TuningBot DTC Database · v4.37.15

P268B Fuel high pressure pump - calibration not learned/programmed

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainFuelOBD2

What P268B means

P268B
Fuel high pressure pump - calibration not learned/programmed Generic · fuel Data confidence 78%

The control module reports that a required adaptation or reference value for the Fuel high pressure pump - calibration has not been learned.

Symptoms

  • Possible hard starting or long cranking
  • Possible reduced power or cutting out
  • MIL illuminated

Possible causes

Calibration not learned

Recommended checks

  • Read specified vs actual rail pressure at cranking, idle and load
  • Check low-pressure supply (pressure/volume) first
  • Check control valve/regulator operation
  • Measure injector return flow where applicable
  • Inspect wiring and connectors of pressure components

Related and nearby codes

How to read P268B

P

Powertrain: engine, transmission and driveline systems.

2

Generic SAE-standard code: same meaning on every make.

68B

Specific fault index within the subsystem.

Frequently asked questions about P268B

What does P268B mean?

Fuel high pressure pump - calibration not learned/programmed. The control module reports that a required adaptation or reference value for the Fuel high pressure pump - calibration has not been learned.

Is P268B generic or manufacturer-specific?

P268B is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P268B at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

ECU tuningDyno-tested results by model and engine See the results →

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