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

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.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. Gently move the wiring with the engine running and watch whether the reading changes.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. Leave any high-voltage measurements to a specialized repair shop

Good to know

• It can trigger limp mode.
• It affects emissions.

What each character of P0C37 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• C: Subsystem depends on the code range
• 37: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0C37?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0C37?

The most common causes are: 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.

Related codes

• P0C33Hybrid/EV Battery Temperature Sensor F Circuit
• P0C34Hybrid/EV Battery Temperature Sensor F Circuit Range/Performance
• P0C35Hybrid/EV Battery Temperature Sensor F Circuit Low
• P0C36Hybrid/EV Battery Temperature Sensor F Circuit High
• P0BC6Hybrid/EV Battery Temperature Sensor E Circuit Intermittent/Erratic

Sources

• gsi.ext.gm.com: 16OBDG02 Hybrid Diagnostics
• gsi.ext.gm.com: 18OBDG02 Hybrid Diagnostics
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.