P0C88 code meaning
Hybrid/EV Battery Temperature Sensor I Circuit
Powertrain system Generic code P0Cxx codes Check engine light
What P0C88 means
P0C88 is the general circuit code for battery temperature sensor I, chosen when the fault is electrical but not classified as low, high or erratic. No manufacturer documents P0C88 publicly. In GM's Volt pack sensor I is the ninth and last thermistor (bulletin 18-NA-342); the 2012 Volt table 12OBDG01A and GM's later tables cover it only through the specific codes P0C89 to P0C8C. Packs with more sensors, such as Mitsubishi's Outlander PHEV with 50, carry the letter as channel [08]. CARB section (e)(15.3.1) requires continuous range and continuity checks on such inputs. With channel I unreliable, the battery controller falls back to cautious power limits. Older code lists show this number as reserved, so some scan tools may not name it.
P0C88 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 P0C88
- Hybrid or EV warning lamp
- Reduced electric power
- Generic scan tools may show the code without a description
Common causes of P0C88
- Most likelyConnector fault on the sensor I circuit
- PossibleThermistor I failed
- Less likelyDefective input channel in the battery sensing electronics
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 P0C88 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. |
| 88 | The exact fault in that area. |
What to do next
- Note P0C88 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 P0C88
What does P0C88 mean?
P0C88 means "Hybrid/EV Battery Temperature Sensor I Circuit". P0C88 is the general circuit code for battery temperature sensor I, chosen when the fault is electrical but not classified as low, high or erratic. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C88?
Drive gently and only to a workshop. With P0C88 the car can go into limp mode (reduced power) to protect itself.
Will P0C88 fail an emissions test?
Yes, it can. P0C88 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 P0C88 to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0C88 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.