Powertrain, generic · Hybrid propulsion

P0C33 Hybrid/EV Battery Temperature Sensor F Circuit

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

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.

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

Symptoms

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

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€150–2,500

Time1–5 h

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

Parts involved

hv battery temp sensor fwiring harnessbms

References: law.cornell.edu, static.nhtsa.gov, gsi.ext.gm.com.