P0A39 code meaning
Generator Temperature Sensor Circuit High
Powertrain system Generic code P0Axx codes Check engine light
What P0A39 means
P0A39 is the high-side counterpart of P0A38: the generator temperature signal stays above the range a working sensor can deliver. Mitsubishi sets it on the 2023 Outlander PHEV when the generator W-phase coil sensor voltage reaches 4.93 V or more for at least 0.5 s. A voltage that close to the reference typically means the sensor circuit is open, a connector is unplugged or a terminal has lost contact, less often a short to a supply. Mitsubishi points to the power drive unit, the coil sensor in the generator and the harness. P0A37 handles implausible but in-range readings, P0A3B a real overheat. No other manufacturer documents P0A39 publicly. The system cannot protect the generator and limits its use.
P0A39 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0A39
- Hybrid warning or check engine light
- Generator temperature shows a very low fixed value
- Generator output or series mode restricted
Common causes of P0A39
- Most likelyOpen sensor circuit or unplugged generator connector
- PossibleSpread or corroded terminals at the generator or power drive unit
- PossibleGenerator coil sensor open internally
- Less likelySignal wire shorted to a supply voltage
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Generator temp sensorWiring harnessHybrid control module
What each part of P0A39 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| 39 | The exact fault in that area. |
What to do next
- Note P0A39 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0A39
What does P0A39 mean?
P0A39 means "Generator Temperature Sensor Circuit High". P0A39 is the high-side counterpart of P0A38: the generator temperature signal stays above the range a working sensor can deliver. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A39?
Drive gently and only to a workshop. With P0A39 the car can go into limp mode (reduced power) to protect itself.
Will P0A39 fail an emissions test?
Yes, it can. P0A39 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0A39 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0A39 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.