Powertrain, generic · Hybrid propulsion

P0C7E Hybrid/EV Battery Temperature Sensor G Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

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.

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

Symptoms

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

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€150–2,500

Time1–5 h

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

Parts involved

hv battery temp sensor gwiring harnessbms

References: gsi.ext.gm.com, static.nhtsa.gov, mitsubishitechinfo.com.