Powertrain, generic · Hybrid propulsion

P0AEC Hybrid/EV Battery Temperature Sensor D Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Loose terminal or connector not fully latched at sensor D
Partly broken or chafed sensor wire
Fault on the battery sensing board

Symptoms

  • Malfunction indicator lamp after two trips, may go out again
  • Jumping battery temperature in live data
  • Occasional power limitation

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,000
Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery temp sensor dwiring harnessbms

Related codes

P0AE8P0AE9P0AEAP0AEBP0ACE

References: gsi.ext.gm.com, gsi.ext.gm.com.