P0A3B code meaning
Generator A Over Temperature
Powertrain system Generic code P0Axx codes Check engine light
What P0A3B means
P0A3B reports that the hybrid generator itself has become too hot, with the temperature sensor working correctly. Mitsubishi documents it as generator coil temperature high on the 2023 Outlander PHEV: the monitor runs continuously and sets the code when the W-phase coil temperature criterion of 199 °C is met for one second. Mitsubishi's checks cover higher-priority codes, the radiator fan, and the EV oil cooling circuit that cools the generator; if those are fine, the generator is replaced. P0A37 to P0A39 are the sensor faults that must be ruled out first, P0A3E the over-temperature of the generator inverter. No other manufacturer documents P0A3B publicly. The system restricts generator output, which can cut charging and series-mode power.
P0A3B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0A3B
- Hybrid system warning or overheat message
- Reduced charging and power when the engine drives the generator
- Battery state of charge drops during driving
Common causes of P0A3B
- Most likelyFault in the oil cooling circuit of the generator (low oil, leak, pump)
- PossibleRadiator fan not working
- PossibleInternal generator fault such as damaged winding insulation
- Less likelyPower drive unit commanding excessive generator current
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Generator aGenerator temp sensor
What each part of P0A3B 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. |
| 3B | The exact fault in that area. |
What to do next
- Note P0A3B 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 P0A3B
What does P0A3B mean?
P0A3B means "Generator A Over Temperature". P0A3B reports that the hybrid generator itself has become too hot, with the temperature sensor working correctly. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A3B?
Drive gently and only to a workshop. With P0A3B the car can go into limp mode (reduced power) to protect itself.
Will P0A3B fail an emissions test?
Yes, it can. P0A3B 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 P0A3B to fix?
Difficulty: workshop only. A typical repair takes 1 to 10 hours of work. This is a job for a workshop.
Will P0A3B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.