Powertrain, generic (extended)

P2A5E Alternative Fuel Vaporizer C Outlet Temperature Sensor Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2A5E marks an unsteady vaporizer C signal: brief dropouts, spikes or a jagged trace that a coolant-heated part cannot really produce. The fault often clears itself and returns, so it matters what conditions trigger it. Gas controllers such as AC STAG store a frozen frame of the moment an error occurs; logging the three outlet temperatures side by side during a test drive shows quickly whether only C misbehaves. Common culprits are a connector that has lost its grip, a pin pushed back in the housing and a cable rubbing against a bracket. CARB requires the detection of such sporadic faults on emission-relevant inputs. No manufacturer documents P2A5E. Until repaired, the gas system may drop out now and then.

Likely causes

Connector of sensor C without firm grip
Contact pin pushed back in the housing
Cable rubbing on a bracket

Symptoms

  • Check engine light now and then, depending on calibration
  • Gas operation drops out occasionally
  • Spiky vaporizer C trace in recorded data

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–450
Time0.5–3 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

P2A5AP2A5BP2A5CP2A5DP2A59

References: law.cornell.edu, mystag.pl, patents.google.com.