P0590 - Cruise Control Multi-Function Input B Circuit Stuck

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

Code Overview

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

Common Causes

• Cruise-control switch or servo fault
• Damaged wiring or connector
• Intermittent control-circuit issue

Diagnostic Steps

1. Inspect cruise-control switch and servo circuits
2. Watch input or control data if supported
3. Check connector condition and continuity

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.