P0BC3Hybrid/EV Battery Temperature Sensor E Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0BC3 is the plausibility check for battery temperature sensor E, GM's sensor 5: its reading is compared with the other pack sensors, which should agree closely. GM's 2016 hybrid table fails it when E is more than 25 °C away from the average of the others in 50 of 67 samples; the 2018 CT6 plug-in table more than 20 °C for 5 s within 6.7 s; the eAssist mild hybrid (13OBDG05C) allows only 8.55 °C, and only after the module has been off for more than six hours. All are Type B, two trips. The check is suspended while circuit codes are active, so it points to a sensor that reads wrongly but in range, or to a real hot spot. Volt bulletin 18-NA-342 counts it among codes that set falsely in cold weather and fixes them by reprogramming.
- What you may notice
- MIL on after two trips
- Battery too cold or reduced power message
- Limited charge and discharge power
- Likely causes
- PossibleSensor E drifting or poorly seated on its cell group
- PossibleModule software setting the code falsely in the cold (GM Volt)
- RareReal local hot spot from a weak cell group or blocked airflow
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.