Powertrain, generic · Hybrid propulsion

P0CBB Hybrid/EV Battery Temperature Sensor P Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0CBB is about short dropouts or spikes in the signal of sensor P that do not last long enough, or go far enough, to trip the low or high code. GM defines it in the HPC2 tables 16OBDG02 to 19OBDG02 and judges how restless the signal is: within each window of ten samples taken 100 ms apart the size of every change is added up, a total above 10 fails the window, and four bad windows in five produce the code, Type B, two trips. Enable conditions are more than 10.2 V and communication with the battery interface module. Neither the 2011/2012 Volt tables nor Mitsubishi know this fault type for sensor P. An intermittent contact often shows up only with vibration or temperature change, so the freeze frame and a road test with live data matter more than a static resistance check.

Likely causes

Intermittent contact at the sensor P plug
Hairline crack in the sensing board near the sensor P input
Unstable reference or ground of the monitoring unit

Symptoms

  • Intermittent warning that may clear by itself
  • Erratic sensor P reading in live data

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
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

P0CB7P0CB8P0CB9P0CBAP0CB6

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