Powertrain, generic · Hybrid propulsion

P0BC5 Hybrid/EV Battery Temperature Sensor E Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0BC5 reports that battery temperature sensor E delivers a voltage above its valid range. With GM's NTC sensors that reads as extreme cold, pointing to an open wire, a backed-out pin at the sensing board or a cracked thermistor. GM's 2016 table sets it below -69 °C in 8 of 10 samples, the 2011 Volt table and GM's 2019 battery module table below -40 °C for 1.4 s within 2 s, and the eAssist mild hybrid above 4.63 V, about -45 °C, in 7 of 10 samples; all Type B, two trips. On the Chevrolet Volt, bulletin 18-NA-342 links these codes to a Battery Too Cold message at ambient temperatures above -25 °C and prescribes reprogramming. Its counterpart is P0BC4. A pack the controller believes frozen gets strict charge and power limits.

Likely causes

Open sensor E wire or backed-out pin at the sensing board
Cracked or open thermistor E
Module software misreading in the cold (GM Volt, reprogramming)

Symptoms

  • MIL on after two trips
  • Battery too cold, plug in to warm message
  • Very limited power or charging

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–2,500
Time0.5–5 h

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

Parts involved

hv battery temp sensor ewiring harnessbms

Related codes

P0BC4P0BC3P0BC2P0BC6P0AEBP0C36

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