P0CBA code meaning
Hybrid/EV Battery Temperature Sensor P Circuit High
Powertrain system Generic code P0Cxx codes Check engine light
What P0CBA means
P0CBA appears when the signal of sensor P rises above its upper voltage limit, the typical picture of an open circuit: without a closed path through the thermistor, the pull-up resistor drives the input high and the computed temperature drops to an absurd value. GM's 2019 HPC2 table 19OBDG02 fails it when 8 of 10 readings at 100 ms fall below −69 °C, Type B, provided supply exceeds 10.2 V and the battery interface control module is online. In the 2011 Volt table the limit was −40 °C, a raw count above 4,000, held 1.4 s within 2 s, and a single trip set the code. On the Outlander PHEV, Mitsubishi files P0CBA as an open circuit of module sensor [15] once the voltage stays above 3.97 V for 2 s. Cold-weather strategies such as pack heating may then start needlessly; P0CB9 is the matching low code.
P0CBA 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 P0CBA
- Very low battery temperature displayed on a warm day
- Battery heater or engine running more than usual
Common causes of P0CBA
- Most likelyOpen circuit or disconnected plug of sensor P
- PossibleThermistor P broken internally
- Less likelySpread or corroded terminal on the sensing board
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 pWiring harnessBms
What each part of P0CBA 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. |
| BA | The exact fault in that area. |
What to do next
- Note P0CBA 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 P0CBA
What does P0CBA mean?
P0CBA means "Hybrid/EV Battery Temperature Sensor P Circuit High". P0CBA appears when the signal of sensor P rises above its upper voltage limit, the typical picture of an open circuit: without a closed path through the thermistor, the pull-up resistor drives the input high and the computed temperature drops to an absurd value. It is a generic code, so it means the same on every make.
Is it safe to drive with P0CBA?
Drive gently and only to a workshop. With P0CBA the car can go into limp mode (reduced power) to protect itself.
Will P0CBA fail an emissions test?
Yes, it can. P0CBA 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 P0CBA to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P0CBA 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.