P0578 - Cruise Control Multi-Function Input A Circuit Stuck

The ECM detected a stuck signal in cruise-control multi-function input A.

Code Overview

The ECM detected a stuck signal in cruise-control multi-function input A.

Common Causes

• Cruise-control switch fault
• Brake switch or steering wheel switch issue
• Damaged wiring, clock spring, or connector

Diagnostic Steps

1. Watch switch input data on the scan tool if supported
2. Inspect steering wheel switch and clock spring circuits
3. Check brake switch operation and connector fit

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.