P0A3AGenerator Temperature Sensor Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Hybrid warning that appears now and then
- Generator temperature jumps in live data
- Occasionally restricted battery charging by the engine
- Likely causes
- LikelyLoose or fretting terminal in the generator sensor connector
- PossibleMoisture or corrosion in the connector
- PossibleHarness chafed against the transaxle housing
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.