Fault Code P0AA4
Code meaning, symptoms, possible causes, part number, and estimated cost.
P0AA4
Hybrid Battery Negative Contactor Circuit
This code indicates a fault in the hybrid battery negative contactor circuit. This contactor is responsible for connecting and disconnecting the high-voltage battery, and a fault prevents operation or charging.
Part Details
Part Name
Hybrid Battery Negative Contactor
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪800 - ₪2,500
Engine Location
Hybrid battery unit
Symptoms
- Vehicle does not start in hybrid mode
- Hybrid system warning light
- Check Engine Light on
- No power supply from hybrid battery
Possible Causes
- 1Faulty negative contactor
- 2Damaged wiring to the contactor
- 3Defective Battery Control Module (BCM)
- 4Over/under voltage in the circuit
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