P0CB6 code meaning
Hybrid/EV Battery Temperature Sensor O Circuit Intermittent/Erratic
Powertrain system Generic code P0Cxx codes Check engine light
What P0CB6 means
P0CB6 targets a sensor O signal that jitters or jumps instead of changing smoothly. Only GM's later HPC2 tables (16OBDG02 to 19OBDG02) define it: every 100 ms a sample is taken, the absolute steps between ten consecutive samples are summed, and a sum above 10 marks that window as failed. Four failed windows out of five set the code as Type B, so the lamp follows on the second trip; the test needs more than 10.2 V and a working link to the battery interface module. The earlier Volt tables of 2011 and 2012 had no such code for O, and Mitsubishi uses none for its pack sensors. Because the reading can stay inside the valid band, P0CB4 and P0CB5 may never appear. Shaking the harness while watching live data, and the freeze-frame record, help to find a fretting contact or cracked solder joint.
P0CB6 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 P0CB6
- Warning lamp that comes and goes
- Sensor O value jumping in live data
Common causes of P0CB6
- Most likelyFretting or loose terminal in the sensor O circuit
- PossibleCracked solder joint or trace on the sensing board
- Less likelyChafed lead touching ground only under vibration
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 oWiring harnessBms
What each part of P0CB6 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. |
| B6 | The exact fault in that area. |
What to do next
- Note P0CB6 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 P0CB6
What does P0CB6 mean?
P0CB6 means "Hybrid/EV Battery Temperature Sensor O Circuit Intermittent/Erratic". P0CB6 targets a sensor O signal that jitters or jumps instead of changing smoothly. It is a generic code, so it means the same on every make.
Is it safe to drive with P0CB6?
Drive gently and only to a workshop. With P0CB6 the car can go into limp mode (reduced power) to protect itself.
Will P0CB6 fail an emissions test?
Yes, it can. P0CB6 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 P0CB6 to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0CB6 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.