P0CD7 code meaning
Hybrid/EV Battery Pack Coolant Temperature Sensor B Circuit Low
Powertrain system Generic code P0Cxx codes Check engine light
What P0CD7 means
P0CD7 reports that the signal of battery coolant temperature sensor B at the pack outlet has dropped toward ground. On an NTC thermistor with pull-up resistor a low voltage reads as very hot coolant, so a short to ground or a damaged sensor is the usual explanation rather than real overheating. GM's battery energy control module in the 2011 Chevrolet Volt and 2016 Cadillac ELR stores the code once the outlet value reaches 87.9 °C, an ADC count of 130 or less, for 1.75 s within a 2.5 s window; it is rated Type B, so the MIL lights after the second trip. While it is active, GM suspends the outlet plausibility test P0CD6 and the coolant pump checks that rely on this value. Expect reduced charging or power until the signal is back. The open-circuit counterpart is P0CD8, sensor A low is P0C44.
P0CD7 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 P0CD7
- MIL on after two trips (GM)
- Displayed outlet coolant temperature implausibly high
- Charging or drive power reduced
Common causes of P0CD7
- Most likelySignal wire of sensor B shorted to ground
- PossibleSensor B internally shorted or water-damaged
- Less likelyInput stage of 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 P0CD7 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. |
| D7 | The exact fault in that area. |
What to do next
- Note P0CD7 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 P0CD7
What does P0CD7 mean?
P0CD7 means "Hybrid/EV Battery Pack Coolant Temperature Sensor B Circuit Low". P0CD7 reports that the signal of battery coolant temperature sensor B at the pack outlet has dropped toward ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P0CD7?
Drive gently and only to a workshop. With P0CD7 the car can go into limp mode (reduced power) to protect itself.
Will P0CD7 fail an emissions test?
Yes, it can. P0CD7 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 P0CD7 to fix?
Difficulty: hard. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P0CD7 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.