Powertrain, generic · Hybrid propulsion

P0C90 Hybrid/EV Battery Temperature Sensor J Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0C90 reports the opposite case: sensor J reads above its voltage window, which with a pull-up circuit points to an open thermistor, a broken lead or a disconnected plug, and the controller sees an impossibly cold module. In GM's 2016 and 2019 tables (16OBDG02, 19OBDG02) a converted value colder than −69 °C in 8 out of 10 readings, one every 100 ms, fails the test; it is Type B, so the lamp waits for the second bad trip, and it runs only above 10.2 V with communication intact. For sensor [09] of the 2018 Outlander PHEV, Mitsubishi records an open when more than 3.97 V, below −62 °C, persists for 2 s. Because the battery seems frozen, the system may limit power, keep the engine running or ask for warming on a plug-in. P0C8F is the short-circuit counterpart.

Likely causes

Open lead or unplugged connector at sensor J
Thermistor J open internally
Terminal pushed back in the monitoring board plug

Symptoms

  • Battery-too-cold message although the weather is mild
  • Little or no electric drive power
  • Battery heater switching 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 jwiring harnessbms

Related codes

P0C8FP0C8EP0C8DP0C91P0C8BP0C95

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