OBD-II code · Powertrain (generic)
P0CA9 Hybrid/EV Battery Temperature Sensor M Range/Performance
The HV battery temperature sensor M reports a range/performance fault. Cell-group temperature monitoring impaired on this channel.
Is it safe to drive with P0CA9?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor characteristic drifted
- PossibleSensor mounting displaced
- Less likelySensor element aged beyond calibration window
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
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery Temp Sensor M, Wiring Harness, Bms
Related codes
- P0C7DHybrid/EV Battery Temperature Sensor G Range/Performance
- P0C82Hybrid/EV Battery Temperature Sensor H Range/Performance
- P0C89Hybrid/EV Battery Temperature Sensor I Range/Performance
- P0C8EHybrid/EV Battery Temperature Sensor J Range/Performance
- P0C93Hybrid/EV Battery Temperature Sensor K Range/Performance
- P0C98Hybrid/EV Battery Temperature Sensor L Range/Performance
- P0CAEHybrid/EV Battery Temperature Sensor N Range/Performance
- P0CB3Hybrid/EV Battery Temperature Sensor O Range/Performance
- P0CB8Hybrid/EV Battery Temperature Sensor P Range/Performance
- P0CA6Hybrid/EV Battery Charging Current High
- P0CA7Hybrid/EV Battery Discharging Current High
- P0CA8Hybrid/EV Battery Temperature Sensor M Circuit
- P0CAAHybrid/EV Battery Temperature Sensor M Circuit Low
- P0CABHybrid/EV Battery Temperature Sensor M Circuit High
- P0CACHybrid/EV Battery Temperature Sensor M Circuit Intermittent/Erratic
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.