Powertrain, generic · Hybrid propulsion

P0C94 Hybrid/EV Battery Temperature Sensor K Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

With P0C94 the controller sees the sensor K signal pulled below its lower limit, a pattern produced by a chafed wire touching ground or an internally shorted thermistor, which the conversion turns into an extreme temperature. GM's 2016 table 16OBDG02 counts a failure whenever the converted value is hotter than 160 °C and needs 8 such readings out of 10, one every 100 ms, Type B; in the 2012 Volt table the same sensor group passes only at or below 87.5 °C. The 2018 Outlander PHEV from Mitsubishi files a short of sensor [10] when the voltage stays below 0.12 V for 2 s. Unlike with the over-temperature code P0A7E, the pack itself is usually not hot. The battery controller nonetheless limits power and may keep the cooling busy; the open-circuit partner is P0C95.

Likely causes

Sensor K signal line shorted to ground

Thermistor K shorted internally

Moisture or coolant reaching the sensor K connection

Symptoms

Warning lamp and reduced electric power
Battery cooling running although the pack is not hot

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 kwiring harnessbms

References: gsi.ext.gm.com, gsi.ext.gm.com, mitsubishitechinfo.com.