P0C8E code meaning
Hybrid/EV Battery Temperature Sensor J Circuit Range/Performance
Powertrain system Generic code P0Cxx codes Check engine light
What P0C8E means
P0C8E sets when sensor J delivers an electrically valid temperature that disagrees with the other modules. For the 2012 Volt, table 12OBDG01A runs the check only after propulsion, off-board charging and battery conditioning have all been inactive for more than 21,600 s, so the pack should be evenly soaked; a gap above 25.3 °C to the mean of the remaining sensors in 50 of 67 samples fails it, Type B. The 2019 GM table 19OBDG02 keeps the logic with a 25.00 °C limit. Mitsubishi, on the 2018 Outlander PHEV, calls it rationality of sensor [09] and accepts a much smaller gap of 13 °C once the car has stood for 3,600 s. A loosened sensor or a real hot spot is more likely than a wiring fault; P0C8F and P0C90 cover shorts and opens.
P0C8E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0C8E
- Warning lamp appearing after the car has been parked for many hours
- Battery power reduced while the pack is cold or warm
Common causes of P0C8E
- Most likelyThermistor J drifted but still within its electrical range
- PossibleSensor J no longer pressed against its cell group
- Less likelyActual temperature difference from a weak cell or blocked cooling path
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 jWiring harnessBms
What each part of P0C8E 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. |
| 8E | The exact fault in that area. |
What to do next
- Note P0C8E 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 P0C8E
What does P0C8E mean?
P0C8E means "Hybrid/EV Battery Temperature Sensor J Circuit Range/Performance". P0C8E sets when sensor J delivers an electrically valid temperature that disagrees with the other modules. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C8E?
Drive gently and only to a workshop. With P0C8E the car can go into limp mode (reduced power) to protect itself.
Will P0C8E fail an emissions test?
Yes, it can. P0C8E 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 P0C8E to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P0C8E 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.