Powertrain, generic · Hybrid propulsion

P0A3B Generator A Over Temperature

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A3B reports that the hybrid generator itself has become too hot, with the temperature sensor working correctly. Mitsubishi documents it as generator coil temperature high on the 2023 Outlander PHEV: the monitor runs continuously and sets the code when the W-phase coil temperature criterion of 199 °C is met for one second. Mitsubishi's checks cover higher-priority codes, the radiator fan, and the EV oil cooling circuit that cools the generator; if those are fine, the generator is replaced. P0A37 to P0A39 are the sensor faults that must be ruled out first, P0A3E the over-temperature of the generator inverter. No other manufacturer documents P0A3B publicly. The system restricts generator output, which can cut charging and series-mode power.

Likely causes

Fault in the oil cooling circuit of the generator (low oil, leak, pump)
Radiator fan not working
Internal generator fault such as damaged winding insulation
Power drive unit commanding excessive generator current

Symptoms

  • Hybrid system warning or overheat message
  • Reduced charging and power when the engine drives the generator
  • Battery state of charge drops during driving

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–5,000
Time1–10 h

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

Parts involved

generator agenerator temp sensor

Related codes

P0A37P0A38P0A39P0A3EP0A35

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