What are the common causes of P0BC1?

An overvoltage feed to the pack cooling fan. A short to voltage on the fan supply wire. A corroded fan supply connector. A cooling fan relay stuck closed. A battery energy control module fault.

Read the cooling fan supply voltage on a scan tool. Inspect the fan supply wire for a short to voltage. Check the fan connector for corrosion. Test the cooling fan relay for sticking. Replace the relay if it stays closed. Clear the code and retest.

P0BC1

Hybrid/EV Battery Pack Cooling Fan Supply Voltage Circuit High

System: Powertrain control (P code)
Lamp: Check Engine Light
Category: Powertrain - Hybrid Propulsion

What it means

P0BC1 means Hybrid/EV Battery Pack Cooling Fan Supply Voltage Circuit High.

Check these first

An overvoltage feed to the pack cooling fan
A short to voltage on the fan supply wire
A corroded fan supply connector
A cooling fan relay stuck closed
A battery energy control module fault

What to do next

Read the cooling fan supply voltage on a scan tool
Inspect the fan supply wire for a short to voltage
Check the fan connector for corrosion
Test the cooling fan relay for sticking
Replace the relay if it stays closed
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.