P0A7E: Hybrid/EV Battery Pack Over Temperature

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.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

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

Most likely causes

Battery cooling fan inoperative or intake/filter clogged
Battery controller software logic (update released by Subaru, Porsche)
Low 12 V system voltage stopping the cooling fan
Aged cells with high internal resistance heating up

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

It can trigger limp mode.
It affects emissions.

What each character of P0A7E means

P: Powertrain: engine and transmission
0: Generic code: same on every make
A: Hybrid or air and fuel
7E: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0A7E?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0A7E?

The most common causes are: battery cooling fan inoperative or intake/filter clogged; battery controller software logic (update released by Subaru, Porsche); low 12 V system voltage stopping the cooling fan.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.