P0ACC code meaning
Hybrid/EV Battery Temperature Sensor C Circuit Low
Powertrain system Generic code P0Axx codes Check engine light
What P0ACC means
P0ACC sets when the signal of battery temperature sensor C drops below the valid voltage window. For the NTC sensors GM uses, that equals an impossibly hot reading, most often caused by a short to ground in the pack wiring. GM's thresholds for sensor C mirror those for B: above 160 °C in 8 of 10 samples in the 2016 and 2019 tables, above 95 °C in 30 of 40 in the two-mode tables of 2011 and 2013, and below 0.3 V, about 90 °C, in 7 of 10 in the 2013 table 13OBDG05C; always Type B, two trips. Bulletin 18-NA-342 lists P0ACC for the Chevrolet Volt and prescribes a software update first. After that, inspect the sensor C wiring and the sensing board for chafing or moisture.
P0ACC 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 P0ACC
- Check engine or hybrid warning light
- Sensor C shows an implausibly high temperature
- Reduced charging and electric drive power
Common causes of P0ACC
- Most likelySensor C signal shorted to ground
- PossibleThermistor shorted internally
- Less likelyController software setting the code falsely (Volt bulletin 18-NA-342)
- Less likelyMoisture at the sensing board connector
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 cWiring harnessBms
What each part of P0ACC means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| CC | The exact fault in that area. |
What to do next
- Note P0ACC 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 P0ACC
What does P0ACC mean?
P0ACC means "Hybrid/EV Battery Temperature Sensor C Circuit Low". P0ACC sets when the signal of battery temperature sensor C drops below the valid voltage window. It is a generic code, so it means the same on every make.
Is it safe to drive with P0ACC?
Drive gently and only to a workshop. With P0ACC the car can go into limp mode (reduced power) to protect itself.
Will P0ACC fail an emissions test?
Yes, it can. P0ACC 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 P0ACC to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P0ACC 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.