Powertrain, generic (extended)

P2539 Low Pressure Fuel System Sensor Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2539 is the general circuit code of the sensor that reports the supply pressure ahead of the high-pressure pump. In VW's 2014 specification books for the Passat, CC and Touareg it is set once the signal exceeds 4.80 V, which the Passat book attributes to a broken line or contact with the positive supply; below 0.2 V VW stores P2541 instead. Deutz's EMR controller files P2539-F0 for a ground fault of the supply pressure sensor. Ford's 2015 Transit with the 3.2 L Duratorq TDCi has a pressure switch: per SSM 51033, units built from 6 March 2015 may log P2539 in a key-on engine-off self-test because no switch change is seen after shutdown, and the code can be ignored if the engine-running test and the MIL are clean. P2540 to P2543 narrow the fault down. Without the signal, supply pressure control runs on a substitute value.

Likely causes

Signal or ground wire open, connector not engaged
Signal wire shorted to the 5 V reference or battery voltage
Failed low-pressure fuel sensor or pressure switch
Code logged only in a static self-test without a real fault (Ford Transit 2015)

Symptoms

  • Check engine light
  • Hesitation or reduced power under load
  • Hard starting, especially after standing

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–350
Time0.5–2 h

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

Parts involved

low pressure fuel sensorsensor wiring

Related codes

P2540P2541P2542P2543P0087

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, serdia.deutz.com.