P0AE3 code meaning
Hybrid/EV Battery Precharge Contactor Circuit Stuck Open
Powertrain system Generic code P0Axx codes Check engine light
What P0AE3 means
P0AE3 is set when the precharge path does not conduct after it has been commanded closed, so the bus voltage fails to rise and the main contactors are not allowed to close. GM documents several cases: preliminary information PIC6165A for the 2016-17 Chevrolet Volt describes a rare P0AE3 in cool weather right after a completed charge, without driveability effects; parts should not be replaced, a new calibration followed, and the MIL goes out after three clean drive cycles. GM bulletin 23-NA-151 lists P0AE3 among high-priority codes on Ultium EVs that call for battery stability checks. Audi includes P0AE300 for the 2022 e-tron GT. Unlike P0AE2, the contacts stay open; a slow precharge is P0C78.
P0AE3 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 8 hours
- Clears after repairAfter a drive cycle
Symptoms of P0AE3
- Vehicle does not become ready to drive
- MIL or service engine soon light on
- No battery charge level shown after switching on
Common causes of P0AE3
- Most likelyBattery controller calibration sets the code under certain conditions (GM Volt, Audi)
- PossiblePrecharge contactor contacts burnt or coil not pulling in
- PossiblePrecharge resistor or its fuse open
- Less likelyInternal fault in the battery disconnect unit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery precharge contactor
What each part of P0AE3 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. |
| E3 | The exact fault in that area. |
What to do next
- Note P0AE3 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 P0AE3
What does P0AE3 mean?
P0AE3 means "Hybrid/EV Battery Precharge Contactor Circuit Stuck Open". P0AE3 is set when the precharge path does not conduct after it has been commanded closed, so the bus voltage fails to rise and the main contactors are not allowed to close. It is a generic code, so it means the same on every make.
Is it safe to drive with P0AE3?
Drive gently and only to a workshop. With P0AE3 the car can go into limp mode (reduced power) to protect itself.
Will P0AE3 fail an emissions test?
Yes, it can. P0AE3 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 P0AE3 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 8 hours of work. This is a job for a workshop.
Will P0AE3 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.