Cruise Control Multi-Function Input 'A' Circuit Stuck

What it means

P0578 is stored when the engine control module commands the Cruise Control Multi-Function Input 'A' Circuit Stuck to move but the feedback shows it stays in one position. The cause is mechanical binding, carbon or dirt, or a failed actuator.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

Symptoms

• Check engine light on
• Idle too high, too low or hunting
• Stalling when coming to a stop
• Speedometer or cruise control not working in some cases

Common causes

1. Carbon, varnish or dirt build-up blocking movement
2. Worn or seized actuator mechanism
3. Broken return spring or linkage
4. Failed position feedback sensor giving a false reading
5. Low supply voltage to the actuator motor

How to diagnose

1. Command the Cruise Control Multi-Function Input 'A' Circuit Stuck with a scan tool and watch the feedback position
2. Remove and inspect the component for carbon, dirt or mechanical damage
3. Clean the mechanism and check it moves freely through its full range
4. Measure supply voltage and resistance of the actuator motor
5. Replace the actuator if it still does not follow commands

Related codes

Nearby codes in this group

• P0577Cruise Control Input Circuit High
• P0579Cruise Control Multi-Function Input 'A' Circuit Range/Performance
• P0576Cruise Control Input Circuit Low
• P0580Cruise Control Multi-Function Input 'A' Circuit Low
• P0575Cruise Control Input Circuit
• P0581Cruise Control Multi-Function Input 'A' Circuit High
• P0574Cruise Control System - Vehicle Speed Too High
• P0582Cruise Control Vacuum Control Circuit/Open