P0BC5Hybrid/EV Battery Temperature Sensor E Circuit High
- 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
- P0BC5 reports that battery temperature sensor E delivers a voltage above its valid range. With GM's NTC sensors that reads as extreme cold, pointing to an open wire, a backed-out pin at the sensing board or a cracked thermistor. GM's 2016 table sets it below -69 °C in 8 of 10 samples, the 2011 Volt table and GM's 2019 battery module table below -40 °C for 1.4 s within 2 s, and the eAssist mild hybrid above 4.63 V, about -45 °C, in 7 of 10 samples; all Type B, two trips. On the Chevrolet Volt, bulletin 18-NA-342 links these codes to a Battery Too Cold message at ambient temperatures above -25 °C and prescribes reprogramming. Its counterpart is P0BC4. A pack the controller believes frozen gets strict charge and power limits.
- What you may notice
- MIL on after two trips
- Battery too cold, plug in to warm message
- Very limited power or charging
- Likely causes
- LikelyOpen sensor E wire or backed-out pin at the sensing board
- PossibleCracked or open thermistor E
- RareModule software misreading in the cold (GM Volt, reprogramming)
- 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.