P0AA9 Possible Causes
- Hybrid battery junction block
- Faulty battery intelligent unit
- Defective HV battery
- Inverter with converter
What Does It Mean?
How to Fix P0AA9 Code
Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P0AA9 Possible Symptoms
Check engine light on (or service engine soon warning light)
P0AA9 Meaning
The power management control ECU monitors the battery intelligent unit and detects isolation malfunctions in the high voltage system.