OBD-II code · Powertrain (generic)
P0A9E Hybrid/EV Battery Temperature Sensor A Circuit High
The ECM detects a circuit high fault on the hybrid/ev battery temperature sensor a circuit. Reading cannot be used reliably for control.
Is it safe to drive with P0A9E?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to B+
- PossibleOpen sensor
- Less likelyConnector pins corroded - high contact resistance
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
- P0AC8Hybrid/EV Battery Temperature Sensor B Circuit High
- P0ACDHybrid/EV Battery Temperature Sensor C Circuit High
- P0AEBHybrid/EV Battery Temperature Sensor D Circuit High
- P0BC5Hybrid/EV Battery Temperature Sensor E Circuit High
- P0C36Hybrid/EV Battery Temperature Sensor F Circuit High
- P0A9BHybrid/EV Battery Temperature Sensor A Circuit
- P0A9CHybrid/EV Battery Temperature Sensor A Circuit Range/Performance
- P0A9DHybrid/EV Battery Temperature Sensor A Circuit Low
- P0A9FHybrid/EV Battery Temperature Sensor A Circuit Intermittent/Erratic
- P0AA0Hybrid/EV Battery Positive Contactor Circuit
- P0AA1Hybrid Battery Positive Contactor Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.