P0C33: Hybrid/EV Battery Temperature Sensor F Circuit

Battery temperature sensor F is the sixth thermistor in the high-voltage pack; GM's Volt bulletin 18-NA-342 lists the F codes under temperature sensor 6 of nine. P0C33 is the general circuit code for an electrical fault the controller does not classify as low, high or erratic. No manufacturer documents this exact code publicly: GM's hybrid tables use only the more specific siblings P0C34 to P0C37. CARB requires battery temperature sensors to be monitored for circuit faults and, where possible, separate codes that point to the smallest replaceable part. With one temperature missing the controller has to assume the worst and limits charge and discharge power. The sensor sits inside the pack, so checks need high-voltage safety procedures.

High severity. Can I keep driving?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.

Symptoms

Hybrid or EV system warning and MIL
Reduced power or charging rate
Battery cooling running more than usual

Most likely causes

Loose or corroded connector of sensor F at the sensing board
Failed thermistor F
Faulty input on the battery sensing board or module

What to check, in order

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

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
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 P0C33 means

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

Frequently asked questions

Can I keep driving with code P0C33?

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 P0C33?

The most common causes are: loose or corroded connector of sensor F at the sensing board; failed thermistor F; faulty input on the battery sensing board or module.

Related codes

Sources

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.