Powertrain, generic (extended)

P2A5D Alternative Fuel Vaporizer C Outlet Temperature Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2A5D says the vaporizer C sensor signal is stuck high, near the reference voltage, which reads as extreme cold. An interrupted wire, a disconnected or corroded plug, an open sensor or a short to battery voltage are the candidates. Gas controllers that use vaporizer temperature as a release condition, as AC STAG does before switching to gas, will hold off gas mode when they see such a value. With two other vaporizers still reporting, a control unit might be calibrated to carry on without C at reduced output, but no manufacturer documents P2A5D or its reaction. TransEco's analogous rail temperature High code names an open sensor or short to power. Measure resistance at the sensor and compare it with the coolant temperature.

Likely causes

Wire to sensor C interrupted or plug disconnected
Sensor C open inside
Signal lead shorted to battery voltage

Symptoms

  • Check engine light, depending on calibration
  • Gas mode held back or output reduced
  • Vaporizer C shown at extreme cold

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–600
Time0.5–2.5 h

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

Parts involved

alt fuel vaporizer c outlet temp sensorwiring harnessafcm

Related codes

P2A5AP2A5BP2A5CP2A5EP2A58

References: law.cornell.edu, mystag.pl, http:.