Powertrain, generic · Hybrid propulsion

P0C6E Hybrid/EV Battery Temperature Sensor A/B Correlation

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0C6E compares two battery temperature sensors, A and B, with each other rather than judging either one alone. After a long rest the pack should be close to one temperature, so a lasting gap between the two points to a sensor that reads wrongly while staying electrically valid. No manufacturer documents P0C6E publicly; GM and Mitsubishi run the same idea against the pack average and store per-sensor codes instead. GM's eAssist table 13OBDG05C flags sensor 1 (P0A9C) or sensor 2 (P0AC6) beyond 8.55 °C after more than six hours off, Type B; Mitsubishi's 2022 Outlander PHEV allows 13 °C after one hour of soak. A Subaru patent compares a sensor pair after parking once both cool at a similar rate. P0C6F covers the B/C pair.

Likely causes

Thermistor A or B drifted while staying inside its electrical range
Sensor no longer seated against its cell or module
Genuine temperature difference from uneven cooling or a weak cell group
Battery management software with an over-sensitive comparison

Symptoms

  • Hybrid or EV system warning lamp
  • Reduced charge and discharge power
  • Battery fan or cooling running more than usual

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time0.5–6 h

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

Parts involved

hv battery temp sensor ahv battery temp sensor bbms

Related codes

P0C6FP0C70P0A9CP0AC6

References: gsi.ext.gm.com, mitsubishitechinfo.com, patents.google.com, law.cornell.edu.