P0CD8Hybrid/EV Battery Pack Coolant Temperature Sensor B Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0CD8 is the high-voltage fault of battery coolant temperature sensor B at the pack outlet. On the usual NTC circuit the signal rises to the reference when the loop is broken, so the controller sees an impossible temperature below -40 °C. The battery energy control modules of the 2011 Chevrolet Volt and 2016 Cadillac ELR use exactly this limit, an ADC count above 3823, held for 1.75 s within 2.5 s; the code is Type B with the MIL on the second trip. Connectors left unplugged after work on the battery, corroded pins, a broken wire or a short to a supply line are the common findings, an open sensor element is rarer. Until it is fixed the battery may not be heated or cooled as intended and cold-weather power can be limited. The low counterpart is P0CD7, sensor A high is P0C45.
- What you may notice
- MIL on after two trips (GM)
- Outlet coolant temperature shows about -40 °C
- Limited power or charging in cold weather
- Likely causes
- LikelyConnector of sensor B unplugged or not latched after service
- PossibleBroken signal or ground wire, corroded terminals
- RareSignal wire shorted to a voltage source
- RareSensor element internally open
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.