Powertrain, generic · Hybrid propulsion

P0CB9 Hybrid/EV Battery Temperature Sensor P Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0CB9 means the voltage of sensor P has fallen under the valid range. As with the other NTC sensors, low voltage corresponds to high temperature, so a short to ground or a collapsed thermistor makes the module appear to be glowing hot. In GM's HPC2 tables 18OBDG02 and 19OBDG02 the code is set after 8 of 10 readings above 160 °C at 100 ms spacing, Type B, two trips, once system voltage exceeds 10.2 V and the battery interface module communicates. The 2011 Volt table already contained it with 87.5 °C, a raw count below 680, held 1.4 s within 2 s. Mitsubishi treats P0CB9 as a short of module sensor [15] of the Outlander PHEV, below 0.12 V for 2 s, lists no fail-safe function and names battery module or cell monitoring unit as the parts to replace. A genuinely hot pack is reported by P0A7E.

Likely causes

Sensor P signal shorted to ground
Thermistor P internally shorted
Damaged input of the cell monitoring unit for sensor P

Symptoms

  • Module P shown as extremely hot in live data
  • Severe power limitation with warning lamp

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–3,000
Time1–5 h

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

Parts involved

hv battery temp sensor pwiring harnessbms

Related codes

P0CBAP0CB8P0CB7P0CBBP0A7EP0CB4

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