OBD-II code · Powertrain (generic)
P0A9B Hybrid/EV Battery Temperature Sensor A Circuit
The ECM detects a circuit fault on the hybrid/ev battery temperature sensor a circuit. Reading cannot be used reliably for control.
Is it safe to drive with P0A9B?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor failed
- PossibleWiring or connector fault
- Less likelyPack cell imbalance approaching service threshold
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
- Easy
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Hybrid Battery Temp Sensor A, Wiring Harness, Bms
Related codes
- P0AC5Hybrid/EV Battery Temperature Sensor B Circuit
- P0ACAHybrid/EV Battery Temperature Sensor C Circuit
- P0AE8Hybrid/EV Battery Temperature Sensor D Circuit
- P0BC2Hybrid/EV Battery Temperature Sensor E Circuit
- P0C33Hybrid/EV Battery Temperature Sensor F Circuit
- P0A98Hybrid/EV Battery Pack Cooling Fan 2 Stuck On
- P0A99Hybrid/EV Battery Pack Cooling Fan 2 Control Circuit Low
- P0A9AHybrid/EV Battery Pack Cooling Fan 2 Control Circuit High
- P0A9CHybrid/EV Battery Temperature Sensor A Circuit Range/Performance
- P0A9DHybrid/EV Battery Temperature Sensor A Circuit Low
- P0A9EHybrid/EV Battery Temperature Sensor A Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.