P0AEAHybrid/EV Battery Temperature Sensor D Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0AEA means the voltage of battery temperature sensor D is below its valid range. GM uses NTC thermistors with a pull-up on the sensing board, so a low voltage reads as an extremely hot cell, usually from a short to ground. Thresholds vary: above 160 °C in 8 of 10 samples in the 2016 and 2019 tables; above 95 °C in 30 of 40 on the 2011 and 2013 two-mode hybrids; below 0.3 V, about 90 °C, in 7 of 10 in the eAssist table 13OBDG05C; above 87.5 °C for 1.4 s within 2 s in a 2018 controller. All are Type B, two trips. Volt bulletin 18-NA-342 lists P0AEA among codes that can set falsely and calls for a software update first. A genuinely hot pack would trip lower limits earlier, so treat it as electrical.
- What you may notice
- Malfunction indicator lamp after two trips
- Charge and drive power strongly limited
- Battery cooling running more than usual
- Likely causes
- LikelySensor D signal wire shorted to ground
- PossibleTemperature sensor D internally shorted
- PossibleOutdated controller software (GM Volt, bulletin 18-NA-342)
- RareMoisture or damage on the battery sensing board
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.