OBD-II code · Powertrain (generic)
P0AAB Hybrid/EV Battery Voltage Isolation Sensor Circuit Intermittent/Erratic
The ECM detects a circuit intermittent/erratic fault on the hybrid/ev battery voltage isolation sensor circuit. Reading cannot be used reliably for control.
Is it safe to drive with P0AAB?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor connector not seated
- PossibleNoisy ground reference
- Less likelyConnector with intermittent contact under vibration
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–7 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery Voltage Isolation Sensor, Wiring Harness, Bms
Related codes
- P0AA8Hybrid/EV Battery Voltage Isolation Sensor Circuit Range/Performance
- P0AA9Hybrid/EV Battery Voltage Isolation Sensor Circuit Low
- P0AAAHybrid/EV Battery Voltage Isolation Sensor Circuit High
- P0AACHybrid/EV Battery Pack Air Temperature Sensor A Circuit
- P0AADHybrid/EV Battery Pack Air Temperature Sensor A Circuit Range/Performance
- P0AAEHybrid/EV Battery Pack Air Temperature Sensor A Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.