Powertrain, generic · Hybrid propulsion

P0C8E Hybrid/EV Battery Temperature Sensor J Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0C8E sets when sensor J delivers an electrically valid temperature that disagrees with the other modules. For the 2012 Volt, table 12OBDG01A runs the check only after propulsion, off-board charging and battery conditioning have all been inactive for more than 21,600 s, so the pack should be evenly soaked; a gap above 25.3 °C to the mean of the remaining sensors in 50 of 67 samples fails it, Type B. The 2019 GM table 19OBDG02 keeps the logic with a 25.00 °C limit. Mitsubishi, on the 2018 Outlander PHEV, calls it rationality of sensor [09] and accepts a much smaller gap of 13 °C once the car has stood for 3,600 s. A loosened sensor or a real hot spot is more likely than a wiring fault; P0C8F and P0C90 cover shorts and opens.

Likely causes

Thermistor J drifted but still within its electrical range
Sensor J no longer pressed against its cell group
Actual temperature difference from a weak cell or blocked cooling path

Symptoms

  • Warning lamp appearing after the car has been parked for many hours
  • Battery power reduced while the pack is cold or warm

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 jwiring harnessbms

Related codes

P0C8DP0C8FP0C90P0C91P0C89P0C93

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