P01A0 — Alternative Fuel Tank A Pressure Sensor Circuit Low

P01A0: Alternative Fuel Tank A Pressure Sensor Circuit Low — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

P01A0 reports a low electrical signal in the alternative-fuel tank A pressure sensor circuit. Low signal must not be confused with low actual tank pressure.

Affected system: Powertrain

Symptoms

  • Warning light may illuminate
  • Related system function may be impaired
  • Vehicle-specific symptoms vary

Possible causes

  • Fuel supply or pressure issue, restricted injector, actuator fault, connector or wiring damage
  • Related wiring, connector, power or ground fault
  • Vehicle-specific mechanical or control issue

What to check

  • Record stored and pending codes and freeze-frame data
  • Check fuel supply and pressure readings, electrical supply and ground, and the relevant injector or regulator circuit before replacing parts.
  • Confirm measured values against the vehicle service information
  • Retest under the conditions that set the code
  • Check fuel supply and pressure readings, electrical supply and ground, and the relevant injector or regulator circuit before replacing parts.
  • Repair the verified cause and confirm the code does not return

Also written as: P01A0-00, P01A000, PO1A0 (some scan tools add the fault-type byte, e.g. -00).