Powertrain, generic · Hybrid propulsion

P0A37 Generator Temperature Sensor Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0A37 tests whether the generator temperature reading is believable. Mitsubishi documents it for the 2023 Outlander PHEV: once per drive cycle, after at least 5,400 s of soak and with the inverter switched off, the generator W-phase coil temperature is compared with the front motor coil and with the oil temperature. A gap of 26 °C to the motor or 22 °C to the oil, held for 0.8 s, sets the code. Suspects are the power drive unit, the coil sensor inside the generator and the wiring. P0A38 and P0A39 are hard voltage faults of the same sensor, P0A3B the real over-temperature. Mitsubishi is the only manufacturer found that documents P0A37 publicly. The driver sees a warning and generator use may be limited.

Likely causes

Generator coil sensor reading out of tolerance
Corroded connector or damaged harness in the sensor circuit
Fault in the power drive unit that evaluates the sensor
Comparison sensor (motor coil or oil temperature) reads wrong

Symptoms

  • Hybrid warning after the first start of the day
  • Generator temperature differs from oil temperature after a long rest
  • Generator operation possibly 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

P0A36P0A38P0A39P0A3BP0A31

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