Powertrain, generic · Hybrid propulsion

P0CB5 Hybrid/EV Battery Temperature Sensor O Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0CB5 is stored when the input of sensor O sits above its upper voltage limit. An open thermistor, a broken wire or a loose plug lets the pull-up resistor raise the input, so the controller sees a temperature colder than any real pack could be. GM sets it in the HPC2 table 18OBDG02 when 8 of 10 readings at 100 ms intervals come out below −69 °C, Type B, with supply above 10.2 V and intact communication with the battery interface module. The 2011 Volt table drew the line at −40 °C, a raw count above 4,000, for 1.4 s within 2 s, and there one trip sufficed. For the Outlander PHEV, Mitsubishi reads P0CB5 as an open circuit of module sensor [14]: above 3.97 V, below about −62 °C, for 2 s. A plug-in may then warm the pack for nothing or run the engine more; P0CB4 is the low twin.

Likely causes

Open lead or unplugged connector of sensor O
Thermistor O open internally
Corroded or loose terminal at the sensing board

Symptoms

  • Pack shown as extremely cold regardless of weather
  • Less electric power, engine running more on plug-in hybrids

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time0.5–5 h

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

Parts involved

hv battery temp sensor owiring harnessbms

Related codes

P0CB4P0CB3P0CB2P0CB6P0CB0P0CBA

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