What are the common causes of P0578?

A cruise control switch stuck in one position. A short to voltage on input A. A stuck brake pedal position sensor. Corrosion in the switch connector. A PCM input fault.

Watch input A on a scan tool with no buttons pressed. Test input A for a short to voltage. Check the brake pedal position sensor. Inspect the switch connector for corrosion. Replace the switch if input A stays stuck. Clear the code and retest.

P0578

Cruise Control Multi-Function Input A Circuit Stuck

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

What it means

P0578 means Cruise Control Multi-Function Input A Circuit Stuck.

Check these first

A cruise control switch stuck in one position
A short to voltage on input A
A stuck brake pedal position sensor
Corrosion in the switch connector
A PCM input fault

What to do next

Watch input A on a scan tool with no buttons pressed
Test input A for a short to voltage
Check the brake pedal position sensor
Inspect the switch connector for corrosion
Replace the switch if input A stays stuck
Clear the code and retest

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Updated

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