Powertrain, generic · Hybrid propulsion

P0A38 Generator Temperature Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A38 means the generator temperature signal has fallen below the range a healthy sensor can produce. Mitsubishi sets it on the 2023 Outlander PHEV when the voltage of the generator W-phase coil sensor is 0.1 V or less for at least 0.5 s while the generator control unit has at least 8 V supply. Such a low voltage usually comes from a signal wire shorted to ground or a shorted sensor; Mitsubishi lists the power drive unit, the generator coil sensor and damaged wiring or connectors as suspects. P0A39 is the matching high fault, P0A37 the plausibility check and P0A3B a genuine over-temperature. Mitsubishi is the only manufacturer found that documents P0A38. Expect a hybrid warning and restricted generator use.

Likely causes

Sensor signal wire shorted to ground
Generator coil sensor shorted internally
Damaged connector or harness between generator and power drive unit
Faulty sensor input in the power drive unit

Symptoms

  • Hybrid warning or check engine light
  • Generator temperature shows an implausibly high fixed value
  • Battery charging by the engine restricted

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,500
Time1–6 h

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

Parts involved

generator temp sensorwiring harnesshybrid control module

Related codes

P0A36P0A37P0A39P0A3BP0A32

References: mitsubishitechinfo.com, mitsubishitechinfo.com, law.cornell.edu.