P0C8A code meaning
Hybrid/EV Battery Temperature Sensor I Circuit Low
Powertrain system Generic code P0Cxx codes Check engine light
What P0C8A means
P0C8A records a sensor I voltage below the valid band. As the element is an NTC thermistor fed through a pull-up, a low voltage translates into a cell group that seems dangerously hot, typically caused by a short to ground. GM's 2012 Volt table (12OBDG01A) trips above 87.5 °C, an ADC count under 680, for 1.4 s within 2 s, two trips; the 2019 table 19OBDG02 instead fails above 160 °C in 8 of 10 samples, Type B. Bulletin 18-NA-342 assigns it to sensor 9 as the low-voltage fault. Mitsubishi's 2022 Outlander PHEV records a short of channel [08] under 0.12 V, above 125 °C, after 2 s and names the battery module or cell monitoring unit as the part to replace. P0C8B covers the open circuit, P0A7E a pack that really overheats.
P0C8A 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 P0C8A
- Warning lamp with reduced power
- Sensor I shown extremely hot in live data
- Battery cooling running continuously
Common causes of P0C8A
- Most likelySensor I signal shorted to ground
- PossibleThermistor I shorted, for example after coolant or moisture entry
- Less likelyCell monitoring unit input for sensor I faulty
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 P0C8A 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. |
| 8A | The exact fault in that area. |
What to do next
- Note P0C8A 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 P0C8A
What does P0C8A mean?
P0C8A means "Hybrid/EV Battery Temperature Sensor I Circuit Low". P0C8A records a sensor I voltage below the valid band. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C8A?
Drive gently and only to a workshop. With P0C8A the car can go into limp mode (reduced power) to protect itself.
Will P0C8A fail an emissions test?
Yes, it can. P0C8A 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 P0C8A to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0C8A 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.