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.
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 after the first start of the day
- Generator temperature differs from oil temperature after a long rest
- Generator operation possibly restricted
Most 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
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 P0A37 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- A: Hybrid or air and fuel
- 37: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0A37?
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 P0A37?
The most common causes are: 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.
Related codes
- P0A36Generator Temperature Sensor Circuit
- P0A38Generator Temperature Sensor Circuit Low
- P0A39Generator Temperature Sensor Circuit High
- P0A3BGenerator A Over Temperature
- P0A31Drive Motor B Temperature Sensor Circuit Range/Performance
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.