Powertrain, generic · Hybrid propulsion

P0CBA Hybrid/EV Battery Temperature Sensor P Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0CBA appears when the signal of sensor P rises above its upper voltage limit, the typical picture of an open circuit: without a closed path through the thermistor, the pull-up resistor drives the input high and the computed temperature drops to an absurd value. GM's 2019 HPC2 table 19OBDG02 fails it when 8 of 10 readings at 100 ms fall below −69 °C, Type B, provided supply exceeds 10.2 V and the battery interface control module is online. In the 2011 Volt table the limit was −40 °C, a raw count above 4,000, held 1.4 s within 2 s, and a single trip set the code. On the Outlander PHEV, Mitsubishi files P0CBA as an open circuit of module sensor [15] once the voltage stays above 3.97 V for 2 s. Cold-weather strategies such as pack heating may then start needlessly; P0CB9 is the matching low code.

Likely causes

Open circuit or disconnected plug of sensor P
Thermistor P broken internally
Spread or corroded terminal on the sensing board

Symptoms

  • Very low battery temperature displayed on a warm day
  • Battery heater or engine running more than usual

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 pwiring harnessbms

Related codes

P0CB9P0CB8P0CB7P0CBBP0CB5

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