Powertrain, generic · Hybrid propulsion

P0BC6 Hybrid/EV Battery Temperature Sensor E Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0BC6 flags erratic behaviour of battery temperature sensor E: the reading jumps far faster than the heavy battery mass could warm or cool. GM documents the method in its 2016 and 2018 hybrid tables (16OBDG02, 18OBDG02). Sampling every 100 ms, the controller adds up the absolute changes of the sensor value over a 10-sample window; a sum above 10 fails the window, and 4 failed windows out of 5 store the code as Type B, two trips, provided system voltage is above 10.2 V. The same logic covers the other pack sensors. The older Volt, Two-Mode and eAssist tables list no erratic code for sensor E. Typical culprits are a loose terminal, a cracked wire or a connector not fully latched after pack work; if several sensors jump at once, suspect the sensing board.

Likely causes

Loose terminal or unlatched connector of sensor E
Cracked or chafed sensor wire breaking contact intermittently
Sensing board fault affecting several temperature inputs

Symptoms

  • MIL on after two trips
  • Sensor E value jumping on the scan tool
  • Occasional power reduction

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,000
Time1–5 h

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

Parts involved

hv battery temp sensor ewiring harnessbms

Related codes

P0BC2P0BC3P0BC4P0BC5P0AECP0C37

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