P0CD5 code meaning
Hybrid/EV Battery Pack Coolant Temperature Sensor B Circuit
Powertrain system Generic code P0Cxx codes Check engine light
What P0CD5 means
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.
P0CD5 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0CD5
- 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
Common causes of P0CD5
- Most likelyLoose, corroded or unplugged connector or damaged wire at the outlet sensor
- PossibleCoolant temperature sensor B defective
- Less likelyInput circuit or reference in the battery control module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery pack coolant temp sensor bWiring harnessBms
What each part of P0CD5 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C | Area: hybrid propulsion. |
| D5 | The exact fault in that area. |
What to do next
- Note P0CD5 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0CD5
What does P0CD5 mean?
P0CD5 means "Hybrid/EV Battery Pack Coolant Temperature Sensor B Circuit". P0CD5 is the general circuit fault for the second coolant temperature sensor in the liquid loop of a hybrid or EV battery. It is a generic code, so it means the same on every make.
Is it safe to drive with P0CD5?
Drive gently and only to a workshop. With P0CD5 the car can go into limp mode (reduced power) to protect itself.
Will P0CD5 fail an emissions test?
Yes, it can. P0CD5 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0CD5 to fix?
Difficulty: hard. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P0CD5 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.