Powertrain, generic (extended)

P2A44 Alternative Fuel Tank B Pressure Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

The counterpart to P2A43: the voltage on the tank B pressure sensor signal sits above its valid range. TransEco, for the tank A sensor of its gas conversions, names an open sensor or a short to power as the cause of the High code, which matches the usual pull-up layout of such inputs where a broken signal or ground wire drives the reading upward. A seemingly overfull cylinder is the risk here: the gauge may stay at full and the module may keep drawing on tank B as if gas were left, until the engine stumbles. No manufacturer lists P2A44 publicly, and the tank A variant P01A1 appears in Ford's 2014 Boss 302S code list. Start the check with the sensor ground and the plug, then measure signal voltage with the system depressurised.

Likely causes

Sensor ground or signal wire open
Signal wire shorted to 5 V or battery voltage
Tank B sensor faulty internally

Symptoms

  • Check engine light
  • Gauge stuck at full for tank B
  • Stumbling when tank B actually runs empty

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–700
Time1–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

alt fuel tank b pressure sensorwiring harnessafcm

Related codes

P2A41P2A43P2A45P01A1

References: law.cornell.edu, http:, performanceparts.ford.com.