P0C37Hybrid/EV Battery Temperature Sensor F Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- MIL after two trips
- Intermittent hybrid warning, often on rough roads
- Temporarily reduced power
- Likely causes
- LikelyLoose terminal or connector of sensor F not fully latched after pack work
- PossibleCracked sensor wire with intermittent contact
- RareFaulty battery sensing board, often with several sensors affected
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.