P0C7E: Hybrid/EV Battery Temperature Sensor G Circuit Low

P0C7E means the sensor G voltage has fallen below its valid range. The thermistor has a negative temperature coefficient and a pull-up on the sensing board, so a short to ground looks like an extremely hot cell group; low describes the signal, not the temperature. GM's 2019 table for hybrid powertrain control module 2 (19OBDG02) fails it when the converted reading exceeds 160 °C in 8 of 10 samples taken every 100 ms, Type B, two trips; bulletin 18-NA-342 files it under sensor 7 as a low-voltage fault on the Volt. Mitsubishi's Outlander PHEV of 2022 sets it as a sensor [06] short when the voltage stays under 0.12 V, above 125 °C, for 2 s. The open-circuit opposite is P0C7F; a pack that really runs hot reports P0A7E. Expect power limits and hard-working battery cooling.

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

Warning lamp with sharply reduced electric power
Battery cooling fan or chiller running constantly
Engine runs more often on plug-in hybrids

Most likely causes

Sensor G signal line chafed through and shorted to ground
Thermistor G shorted internally, often after moisture entry
Input stage of the cell monitoring board pulled low

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
With the connector unplugged, check whether the signal wire is making contact with ground.
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 P0C7E means

P: Powertrain: engine and transmission
0: Generic code: same on every make
C: Subsystem depends on the code range
7E: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0C7E?

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 P0C7E?

The most common causes are: sensor G signal line chafed through and shorted to ground; thermistor G shorted internally, often after moisture entry; input stage of the cell monitoring board pulled low.

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.