P0CD5Hybrid/EV Battery Pack Coolant Temperature Sensor B Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0CD5 is the general circuit fault for the second coolant temperature sensor in the liquid loop of a hybrid or EV battery. In GM's tables for the Chevrolet Volt and Cadillac ELR, sensor B is the one at the pack outlet, an NTC thermistor read by the battery energy control module, while sensor A sits at the inlet. GM splits electrical faults of sensor B into P0CD7 and P0CD8 and does not list P0CD5 itself. No manufacturer publicly documents this general code; it suits controllers that only recognise an unusable signal without telling low from high. CARB requires battery thermal management inputs to be checked for circuit faults. Without the outlet value the controller no longer knows how much the coolant warms across the pack and may limit charging or drive power. Implausible readings fall under P0CD6.
- What you may notice
- Check engine or hybrid system warning lamp
- Reduced charging or drive power, especially in heat or cold
- Battery heating or cooling runs on substitute values
- Likely causes
- LikelyLoose, corroded or unplugged connector or damaged wire at the outlet sensor
- PossibleCoolant temperature sensor B defective
- RareInput circuit or reference in the battery control module faulty
- 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.