TorqueMech OBD Code Guide
P0579 - Cruise Control Multi-Function Input A Circuit Range/Performance
Cruise-control multi-function input A is outside the expected operating range.
Code first. Confirm symptoms and checks before pricing parts.
Read code pattern
Check likely system
Estimate after confirmation
Common Next Steps
Turn the code into the next check.
Measure pads and rotors
Confirm thickness, scoring, heat spots, and inner/outer wear.
Inspect caliper movement
Check slide pins, piston movement, hose restriction, and drag.
Check hub runout/play
Use when vibration or ABS evidence overlaps brake complaints.
Related Inspection
Code Overview
Cruise-control multi-function input A is outside the expected operating range.
Common Causes
- Cruise-control switch fault
- Brake switch or steering wheel switch issue
- Damaged wiring, clock spring, or connector
Diagnostic Steps
- Watch switch input data on the scan tool if supported
- Inspect steering wheel switch and clock spring circuits
- Check brake switch operation and connector fit
Related OBD Codes
Browse nearby codes when systems overlap.
Next Steps
Move from code to checks, then estimate.