Powertrain, generic · Hybrid propulsion

P0C37 Hybrid/EV Battery Temperature Sensor F Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0C37 targets a sensor F signal that jumps instead of following the slow temperature change of a heavy battery. GM documents the logic in its 2016 to 2018 hybrid tables (16OBDG02, 17OBDG02, 18OBDG02): every 100 ms the controller adds up the absolute changes of the sensor value over a window of 10 samples; a sum above 10 fails the window, and 4 failed windows out of 5 set the code as Type B, two trips, with system voltage above 10.2 V and no communication fault active. The Volt, Two-Mode and eAssist tables have no erratic code for this sensor. Unlike P0C35 and P0C36, the signal stays inside its valid range, so the cause is usually a loose terminal or a cracked wire. If several sensors jump at once, the sensing board is the likelier suspect.

Likely causes

Loose terminal or connector of sensor F not fully latched after pack work
Cracked sensor wire with intermittent contact
Faulty battery sensing board, often with several sensors affected

Symptoms

  • MIL after two trips
  • Intermittent hybrid warning, often on rough roads
  • Temporarily reduced power

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 fwiring harnessbms

Related codes

P0C33P0C34P0C35P0C36P0BC6

References: gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.