Powertrain, generic · Hybrid propulsion

P0C8D Hybrid/EV Battery Temperature Sensor J Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0C8D covers electrical trouble in the circuit of battery temperature sensor J that the controller cannot pin down to a low, high or jumping signal. There is no public manufacturer documentation for P0C8D. GM's 2011 hybrid table counts J as temperature sensor 10 in a list of sixteen, yet like its later tables it only defines the narrower J codes P0C8E to P0C91; Mitsubishi's Outlander PHEV assigns J to module sensor [09] and likewise uses only rationality, short and open codes. Under CARB rule (e)(15.3.1) every such input must be watched all the time for plausible values and an unbroken circuit. Without a valid J reading the battery management protects that cell group by cutting charge and discharge power.

Likely causes

Corroded or loose plug between sensor J and the monitoring board
Thermistor J electrically defective
Faulty input channel on the cell monitoring board

Symptoms

  • Hybrid system warning, on many models also the check-engine lamp
  • Less electric power and slower charging

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 jwiring harnessbms

Related codes

P0C8EP0C8FP0C90P0C91P0C88P0C92

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