P0AEC code meaning
Hybrid/EV Battery Temperature Sensor D Circuit Intermittent/Erratic
Powertrain system Generic code P0Axx codes Check engine light
What P0AEC means
P0AEC flags erratic behaviour of battery temperature sensor D: the reading jumps faster than the heavy battery mass could ever warm or cool. GM documents the method in its 2016 and 2019 hybrid tables. The controller sums the absolute changes of the sensor value across a 10-sample window taken every 100 ms; a sum above 10 fails the window, and 4 failed windows out of 5 store the code as Type B, two trips. GM applies the same logic to sensors A to C. The older two-mode and eAssist tables list no erratic code for sensor D. Typical culprits are a loose terminal, a partly broken wire or a connector not fully latched after pack service. If several sensors jump at once, suspect the sensing board rather than the individual thermistor.
P0AEC 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 P0AEC
- Malfunction indicator lamp after two trips, may go out again
- Jumping battery temperature in live data
- Occasional power limitation
Common causes of P0AEC
- Most likelyLoose terminal or connector not fully latched at sensor D
- PossiblePartly broken or chafed sensor wire
- Less likelyFault on the battery 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 dWiring harnessBms
What each part of P0AEC 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. |
| EC | The exact fault in that area. |
What to do next
- Note P0AEC 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 P0AEC
What does P0AEC mean?
P0AEC means "Hybrid/EV Battery Temperature Sensor D Circuit Intermittent/Erratic". P0AEC flags erratic behaviour of battery temperature sensor D: the reading jumps faster than the heavy battery mass could ever warm or cool. It is a generic code, so it means the same on every make.
Is it safe to drive with P0AEC?
Drive gently and only to a workshop. With P0AEC the car can go into limp mode (reduced power) to protect itself.
Will P0AEC fail an emissions test?
Yes, it can. P0AEC 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 P0AEC to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0AEC 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.