P0A7EHybrid/EV Battery Pack Over Temperature
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The pack controller compares the hottest module temperature with a protection limit. GM sets P0A7E, mostly as Type A (MIL after one trip), when the maximum module temperature exceeds a program limit between about 61 and 73.5 °C, unless a temperature sensor fault is active. Subaru documents it on the 2014–16 Crosstrek Hybrid, where too strict logic for heat after shutdown cut assist and auto start-stop; GM links it on eAssist cars to a cooling fan that stops at low system voltage; Porsche saw it with implausible sensor signals on the 911 GTS T-Hybrid. Sensor circuit faults have their own codes (P0A9B–P0A9E). The car limits charge and discharge power to protect the cells.
- What you may notice
- Hybrid system warning and check engine light
- Reduced electric assist and regeneration
- Auto start-stop no longer works
- In rare cases warning with no-start
- Likely causes
- LikelyBattery cooling fan inoperative or intake/filter clogged
- PossibleBattery controller software logic (update released by Subaru, Porsche)
- PossibleLow 12 V system voltage stopping the cooling fan
- RareAged cells with high internal resistance heating up
- 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: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.