P0AE1 code meaning
Hybrid/EV Battery Precharge Contactor Circuit
Powertrain system Generic code P0Axx codes Check engine light
What P0AE1 means
Before the main contactors close, a precharge contactor routes battery current through a resistor so the inverter capacitors fill slowly instead of drawing a damaging inrush. P0AE1 is the general fault of this precharge path when it is not split into stuck closed (P0AE2), stuck open (P0AE3) or a driver fault (P0AE4 to P0AE7). Honda lists P0AE1 as a bypass contactor malfunction in bulletins 20-030 (2012-15 Civic Hybrid) and 20-021 (2013 ILX Hybrid); there a cracked solder joint in the motor power inverter is the cause and the whole inverter is replaced. Mercedes-Benz names P0AE173 on the G 580 with EQ technology after unplugging the AC charger too early. Expect no ready mode or no charging.
P0AE1 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0AE1
- Hybrid or EV system warning in the cluster
- Vehicle does not become ready to drive
- Charging not possible
Common causes of P0AE1
- Most likelyDefective solder joint in the motor power inverter (Honda IMA)
- PossiblePrecharge contactor or precharge resistor failed
- Less likelyFault logged by battery controller software after an interrupted charging sequence
- Less likelyWiring or connector fault in the contactor circuit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery precharge contactorWiring harnessBms
What each part of P0AE1 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. |
| E1 | The exact fault in that area. |
What to do next
- Note P0AE1 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 P0AE1
What does P0AE1 mean?
P0AE1 means "Hybrid/EV Battery Precharge Contactor Circuit". Before the main contactors close, a precharge contactor routes battery current through a resistor so the inverter capacitors fill slowly instead of drawing a damaging inrush. It is a generic code, so it means the same on every make.
Is it safe to drive with P0AE1?
Drive gently and only to a workshop. With P0AE1 the car can go into limp mode (reduced power) to protect itself.
Will P0AE1 fail an emissions test?
Yes, it can. P0AE1 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 P0AE1 to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0AE1 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.