P0C8C code meaning
Hybrid/EV Battery Temperature Sensor I Circuit Intermittent/Erratic
Powertrain system Generic code P0Cxx codes Check engine light
What P0C8C means
P0C8C reports that sensor I changes faster and more often than any real battery temperature could. GM is the only maker that publishes the test: in 19OBDG02, the 2019 hybrid powertrain control module 2 table, each 10-sample window at 100 ms per sample is scored by the summed absolute change of the reading, a score above 10 counts as a failed window, and 4 failed windows out of 5 set the code, Type B, two trips, with system voltage above 10.2 V and no communication fault to the battery interface module. The 2018 table 18OBDG02 contains the same rule. Unlike P0C8A and P0C8B the value never leaves its valid range. Look for a fretting terminal or a wire broken inside its insulation; several erratic sensors at once point to the sensing board.
P0C8C at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0C8C
- Warning lamp appearing now and then
- Sensor I value jumping in live data
- Short phases of reduced power
Common causes of P0C8C
- Most likelyFretting or loose terminal on the sensor I connector
- PossibleSensor I wire broken inside its insulation
- Less likelySensing board with unstable supply or ground
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery temp sensor iWiring harnessBms
What each part of P0C8C 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. |
| 8C | The exact fault in that area. |
What to do next
- Note P0C8C 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 P0C8C
What does P0C8C mean?
P0C8C means "Hybrid/EV Battery Temperature Sensor I Circuit Intermittent/Erratic". P0C8C reports that sensor I changes faster and more often than any real battery temperature could. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C8C?
Drive gently and only to a workshop. With P0C8C the car can go into limp mode (reduced power) to protect itself.
Will P0C8C fail an emissions test?
Yes, it can. P0C8C 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 P0C8C to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0C8C clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.