P0C44 code meaning
Hybrid/EV Battery Pack Coolant Temperature Sensor A Circuit Low
Powertrain system Generic code P0Cxx codes Check engine light
What P0C44 means
P0C44 reports that the voltage of battery coolant temperature sensor A is too low. The sensor is an NTC thermistor, so a low voltage translates into a very hot reading, and a short to ground or a shorted element is the classic cause. GM documents the code in the battery energy control module: the 2011 Chevrolet Volt sets it when the inlet coolant value reaches 87.9 °C (ADC count 130 or less), the 2019 hybrid tables use the same temperature at an ADC count of 133 or less. The fault must be present for 1.75 s within a 2.5 s window; as a Type B code it turns on the MIL after the second trip. Because the controller can no longer trust the coolant value, it may limit battery power. P0C45 is the high counterpart, P0C42 the generic circuit code.
P0C44 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 P0C44
- MIL and hybrid or EV system message
- Coolant temperature shown implausibly high in live data
- Limited charging or drive power
Common causes of P0C44
- Most likelySensor signal wire chafed through and shorted to ground
- PossibleInternally shorted coolant temperature sensor
- Less likelyCoolant or water in the connector bridging the pins
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 aWiring harnessBms
What each part of P0C44 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. |
| 44 | The exact fault in that area. |
What to do next
- Note P0C44 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 P0C44
What does P0C44 mean?
P0C44 means "Hybrid/EV Battery Pack Coolant Temperature Sensor A Circuit Low". P0C44 reports that the voltage of battery coolant temperature sensor A is too low. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C44?
Drive gently and only to a workshop. With P0C44 the car can go into limp mode (reduced power) to protect itself.
Will P0C44 fail an emissions test?
Yes, it can. P0C44 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 P0C44 to fix?
Difficulty: hard. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P0C44 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.