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.
Medium severity. Can I keep driving?If the battery warning light comes on, you could get stranded. Turn off electrical accessories and go straight to a repair shop.
Symptoms
- Hybrid warning that appears now and then
- Generator temperature jumps in live data
- Occasionally restricted battery charging by the engine
Most likely causes
- Loose or fretting terminal in the generator sensor connector
- Moisture or corrosion in the connector
- Harness chafed against the transaxle housing
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- It can trigger limp mode.
- It affects emissions.
What each character of P0A3A means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- A: Hybrid or air and fuel
- 3A: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0A3A?
If the battery warning light comes on, you could get stranded. Turn off electrical accessories and go straight to a repair shop.
What causes code P0A3A?
The most common causes are: loose or fretting terminal in the generator sensor connector; moisture or corrosion in the connector; harness chafed against the transaxle housing.
Related codes
- P0A36Generator Temperature Sensor Circuit
- P0A37Generator Temperature Sensor Circuit Range/Performance
- P0A38Generator Temperature Sensor Circuit Low
- P0A39Generator Temperature Sensor Circuit High
- P0A34Drive Motor B Temperature Sensor Circuit Intermittent
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.