Powertrain, generic · Hybrid propulsion

P0CB8 Hybrid/EV Battery Temperature Sensor P Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0CB8 flags sensor P as implausible: its value is electrically fine, but after a long rest it disagrees with the temperature of the other modules. GM runs this comparison in the 2012 Volt table 12OBDG01A only when drive system, external charging and battery conditioning have rested for over 21,600 s, so the whole pack should have settled; 50 of 67 samples more than 25.3 °C from the average give a Type B fault. In the HPC2 table 18OBDG02 the limit is 25.00 °C, sampled every 25 ms for about 1.7 s, and the check is held back by circuit or erratic faults and by lost communication. Mitsubishi uses P0CB8 for module sensor [15] of the Outlander PHEV with a 13 °C limit over 0.32 s after more than 3,600 s soak. Comparing all sensors in live data after an overnight stand shows the outlier.

Likely causes

Thermistor P drifted out of calibration
Sensor P detached from its module surface
Real temperature difference of that module, e.g. faulty cell

Symptoms

  • Warning appearing at the first drive after a long stand
  • Battery output restricted

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 pwiring harnessbms

Related codes

P0CB7P0CB9P0CBAP0CBBP0CB3

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