P0AA6
HV system isolation fault
· High voltageHV qualified only- Coolant ingress into HV component
- Damaged HV cable insulation
- Moisture in connector
Diagnostics
Diagnostic Codes
Searchable database of EV diagnostic trouble codes with systems, likely causes and who should fix them.
Safety first: this content is educational. Never work on energized high-voltage parts (orange cables) unless you are HV-qualified.
P0A80
Replace hybrid/EV battery pack
· BatteryHV qualified only- Cell module voltage imbalance
- Severely degraded modules
P0A7F
Battery pack deterioration
· BatteryProfessional- Capacity loss beyond threshold
- Cell ageing
P0AFA
Battery system voltage low
· BatteryProfessional- Very low state of charge
- Weak cell group
P0A94
DC-DC converter performance
· Power electronicsProfessional- Converter failure
- Poor 12 V connection
- Failing 12 V battery
P0A0D
HV interlock circuit high
· High voltageHV qualified only- Service plug not seated
- Loose HV connector
- Interlock wire damage
P0C73
Motor electronics coolant pump
· ThermalProfessional- Pump failure
- Low coolant
- Wiring fault
P0A3F
Drive motor position sensor
· MotorProfessional- Resolver fault
- Connector corrosion
P1E00
Charger (OBC) fault
· ChargingProfessional- On-board charger internal fault
- Pilot signal error from EVSE
U0111
Lost communication with BMS
· NetworkProfessional- CAN bus wiring fault
- Low 12 V voltage
- BMS module failure
U0100
Lost communication with VCU
· NetworkProfessional- Low 12 V supply
- CAN wiring
- Module failure
B1325
12 V supply voltage out of range
· Low voltageEnthusiast- Weak 12 V battery
- DC-DC converter not charging
Code meanings vary by manufacturer; confirm with the vehicle's service information.