Powertrain, generic · Hybrid propulsion

P0C7F Hybrid/EV Battery Temperature Sensor G Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

With P0C7F the sensor G input reads above its valid voltage range. Because the pull-up raises the line when the thermistor is disconnected, an open circuit, broken wire or unplugged connector shows up as an implausibly cold cell group. GM's 2016 Cadillac ELR table (16OBDG01) sets it below −40 °C for 1.4 s within a 2 s window, two trips, and the 2019 table 19OBDG02 below −69 °C in 8 of 10 samples, Type B. Mitsubishi's Outlander PHEV of 2018 calls it a sensor [06] open once the voltage exceeds 3.97 V, colder than −62 °C, for 2 s. On the Volt, GM bulletin 18-NA-342 links these sensor 7 high-voltage sets to a Battery Too Cold message above −25 °C and cures false ones with new software. Its short-circuit partner is P0C7E.

Likely causes

Open circuit or unplugged connector at sensor G

Thermistor G open internally

Module software setting it falsely in mild cold (GM Volt, 18-NA-342)

Symptoms

Battery-too-cold or plug-in-to-warm message although it is not very cold
Reduced electric power or no electric drive
Battery heater switched on without need

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€100–2,500

Time0.5–5 h

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

Parts involved

hv battery temp sensor gwiring harnessbms

Related codes

P0C7E P0C7D P0C7C P0C80 P0C36 P0C84

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