What are the common causes of P0566?

A worn cruise control Off switch. Damaged wiring between the switch and the PCM. A malfunctioning PCM. A bad brake pedal position sensor. Corrosion in the steering wheel connector.

Watch the Off switch input on a scan tool and press it. Test the switch wiring for opens or shorts. Check the brake pedal position sensor. Inspect the steering wheel connector for corrosion. Replace the switch if the Off input never registers. Clear the code and retest.

P0566

Cruise Control Off Signal

System: Speed and idle control (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P0566 means Cruise Control Off Signal.

Check these first

A worn cruise control Off switch
Damaged wiring between the switch and the PCM
A malfunctioning PCM
A bad brake pedal position sensor
Corrosion in the steering wheel connector

What to do next

Watch the Off switch input on a scan tool and press it
Test the switch wiring for opens or shorts
Check the brake pedal position sensor
Inspect the steering wheel connector for corrosion
Replace the switch if the Off input never registers
Clear the code and retest

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Updated

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