Powertrain, generic · Hybrid propulsion

P0A3A Generator Temperature Sensor Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A3A flags a generator temperature signal that is interrupted or jumps only briefly. Since the thermal mass of a generator winding rules out sudden steps, such behaviour indicates a contact or wiring problem rather than a real temperature change. No manufacturer documents P0A3A publicly; Mitsubishi (2023 Outlander PHEV) only lists the permanent faults P0A38 and P0A39 for its generator coil sensor, each needing at least 0.5 s outside the valid voltage before it sets, so short dropouts would not trigger them. CARB 1968.2 calls for circuit monitoring of emission-relevant hybrid parts. Symptoms come and go, often with heat, vibration or moisture, and generator use may be restricted while the fault is present.

Likely causes

Loose or fretting terminal in the generator sensor connector
Moisture or corrosion in the connector
Harness chafed against the transaxle housing

Symptoms

  • Hybrid warning that appears now and then
  • Generator temperature jumps in live data
  • Occasionally restricted battery charging by the engine

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–3,500
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

P0A36P0A37P0A38P0A39P0A34

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