Powertrain, generic · Hybrid propulsion

P0C82 Hybrid/EV Battery Temperature Sensor H Circuit Range/Performance

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

P0C82 is the plausibility test for sensor H: its circuit is fine, but the temperature it reports strays too far from what the rest of the pack says. On the 2016 Cadillac ELR (16OBDG01) GM fails it when the reading differs from the average of the other module groups by more than 20 °C in 50 of 67 samples, Type B; the 2019 table 19OBDG02 allows 25 °C, sampled every 25 ms and only while no low, high or communication fault is active. Mitsubishi files it under sensor [07] in the Outlander PHEV and checks once per drive after an hour of soak against a 13 °C limit. GM bulletin 18-NA-342 names it sensor 8 performance and treats false sets on the Volt with reprogramming. A sensor that came loose from its cells or slowly drifted is the typical real cause.

Likely causes

Thermistor H reading off while still electrically valid

Sensor H lifted off its module, measuring air instead of cells

Outdated battery module software (GM Volt, 18-NA-342)

Genuine local temperature difference from poor coolant flow

Symptoms

Check-engine or hybrid lamp, often after the car has stood for a while
Battery power limited

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€80–2,500

Time0.5–5 h

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

Parts involved

hv battery temp sensor hwiring harnessbms

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