Powertrain
generic / SAE
P0AA8
Hybrid/EV Battery Voltage Isolation Sensor Circuit Range/Performance
The ECM detects a circuit range/performance fault on the hybrid/ev battery voltage isolation sensor circuit. Reading cannot be used reliably for control.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberA / A8
Possible causes
- Sensor characteristic drifted high
- Sensor mounting displaced medium
- Sensor element aged beyond calibration window low
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 300–2000 €
- Estimated time: 2–7 h
- Component: hv battery voltage isolation sensor
- Component: wiring harness
- Component: bms
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012