P0ACD code meaning
Hybrid/EV Battery Temperature Sensor C Circuit High
Powertrain system Generic code P0Axx codes Check engine light
What P0ACD means
P0ACD indicates that battery temperature sensor C reports a voltage above its plausible range, which an NTC sensor translates into extreme cold. Common reasons are an open circuit, a pin backed out of the sensing board connector or a cracked thermistor. GM sets the code below -69 °C in 8 of 10 samples in its 2016 and 2019 tables, below -45 °C in 30 of 40 on the 2011 and 2013 two-mode hybrids, and above 4.63 V, about -45 °C, in 7 of 10 in the 2013 table 13OBDG05C; Type B, two trips. On the Chevrolet Volt, bulletin 18-NA-342 ties it to a false Battery Too Cold message and a reprogramming fix. A seemingly frozen pack is heavily limited in charge and discharge.
P0ACD 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 P0ACD
- Check engine or hybrid warning light
- Battery too cold message in mild weather
- Strongly reduced charging and electric power
Common causes of P0ACD
- Most likelyOpen signal or return wire of sensor C
- PossibleThermistor open or cracked
- PossibleController software issue on the Volt (bulletin 18-NA-342)
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 P0ACD 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. |
| CD | The exact fault in that area. |
What to do next
- Note P0ACD 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 P0ACD
What does P0ACD mean?
P0ACD means "Hybrid/EV Battery Temperature Sensor C Circuit High". P0ACD indicates that battery temperature sensor C reports a voltage above its plausible range, which an NTC sensor translates into extreme cold. It is a generic code, so it means the same on every make.
Is it safe to drive with P0ACD?
Drive gently and only to a workshop. With P0ACD the car can go into limp mode (reduced power) to protect itself.
Will P0ACD fail an emissions test?
Yes, it can. P0ACD 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 P0ACD to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P0ACD 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.