P0AA1
Hybrid/EV Battery Positive Contactor Circuit Stuck Closed
P0AA1 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Positive Contactor Circuit Stuck Closed. Common causes: battery positive contactor fault, problems in the contactor control circuit. Estimated repair cost: $56–222.
Symptoms
- Hybrid/electric system does not turn off when ignition is turned off
- Check engine light comes on
- An error message appears on the dashboard
- Reduced performance of the hybrid system
- The vehicle may not switch to ready mode
Causes
- Battery positive contactor fault
- Problems in the contactor control circuit
- Battery management module (BMS) malfunction
- Short circuit in the contactor circuit
- Mechanical contactor jamming
How to Fix
- Check the condition of the contactor visually
- Test contactor control circuit
- Check the power and ground of the contactor
- Scan the battery control module for additional trouble codes
- Replace faulty contactor if necessary
Related codes
Error P0AA1 by Vehicle Brand
FAQ
What does the P0AA1 code mean?
P0AA1 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Positive Contactor Circuit Stuck Closed
What causes a P0AA1 error code?
The most common causes of P0AA1 include: Battery positive contactor fault; Problems in the contactor control circuit; Battery management module (BMS) malfunction; Short circuit in the contactor circuit.
How do I fix a P0AA1 diagnostic trouble code?
To fix P0AA1: Check the condition of the contactor visually. Test contactor control circuit. Check the power and ground of the contactor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0AA1?
Do not drive — repair immediately
How much does it cost to fix P0AA1?
The estimated repair cost for P0AA1 is $56–222. Actual cost depends on your vehicle, location, and labor rates.
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