P0CD7: Hybrid/EV Battery Pack Coolant Temperature Sensor B Circuit Low
Standardized SAE J2012 code · P0Cxx — Hybrid and electric propulsion
Safety-critical system. Faults in airbags, brakes, steering or high-voltage components can put people at risk. Follow the manufacturer's service information and safety procedures, or have the vehicle checked by a qualified workshop.
What does P0CD7 mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- MIL on after two trips (GM)
- Displayed outlet coolant temperature implausibly high
- Charging or drive power reduced
Common causes
- High Signal wire of sensor B shorted to ground
- Medium Sensor B internally shorted or water-damaged
- Low Input stage of the battery control module faulty
Likelihood is a general estimate across vehicles; your make and model may differ.
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