P0CB0 Hybrid/EV Battery Temperature Sensor N Circuit High

P0CB0 reports a sensor N input above its upper voltage limit, which a pack controller reads as an unrealistically cold module. The NTC sensor is biased by a pull-up resistor, so any interruption in the element, its leads or its plug makes the input rise. GM's 2018 HPC2 table 18OBDG02 lists P0CB0 by name as sensor N circuit high and fails it when 8 of 10 readings at 100 ms are below −69 °C, Type B, two trips; the 2016 table 16OBDG02 uses the same limit and blocks the test while U179C is set. Mitsubishi's Outlander PHEV DTC chart names it the open circuit of sensor [13], judged above 3.97 V, below about −62 °C, for 2 s. Assuming a frozen pack, the controller cuts electric power and plug-ins may switch on heating or the engine. Shorts are covered by P0CAF.

Likely causes

Symptoms

• Battery reported as far too cold in mild conditions
• Less electric range or power, engine starting more often

Repair estimate

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

Parts involved

Related codes

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