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TuningBot DTC Database · v4.37.15

P01A6 Alternative Fuel Rail Pressure Sensor Circuit High

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

P · PowertrainFuelOBD2

What P01A6 means

P01A6
Alternative Fuel Rail Pressure Sensor Circuit High Generic · fuel Data confidence 65%

The control module detected that the signal in the Alternative Fuel Rail Pressure circuit stayed above the expected operating range.

Symptoms

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

Possible causes

  • Low-pressure fuel supply fault (pump, filter, lines)
  • High-pressure pump wear or fault
  • Pressure regulator / volume control valve fault
  • Fuel pressure sensor fault
  • Internal leakage (injector return flow too high)

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 P01A6

P

Powertrain: engine, transmission and driveline systems.

0

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

1A6

Specific fault index within the subsystem.

Frequently asked questions about P01A6

What does P01A6 mean?

Alternative Fuel Rail Pressure Sensor Circuit High. The control module detected that the signal in the Alternative Fuel Rail Pressure circuit stayed above the expected operating range.

Is P01A6 generic or manufacturer-specific?

P01A6 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P01A6 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

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