P0569: Cruise Control Coast Signal

What it means

The coast (decelerate) signal of the cruise control reports an implausible state - typically a stuck or shorted contact.

At a glance

• Usually lights the check-engine light

How it works

The cruise-control coast switch signals the control module to reduce the set speed or coast without adding throttle. P0569 sets when the coast signal is implausible, often because a switch contact is stuck or the circuit is shorted.

Common causes

Most likely first.

1. Cruise control coast switch or stalk failed or stuck
2. Open or short in switch wiring
3. Loose or corroded connector
4. Fault in the related control module

Symptoms

• Cruise control may not reduce the set speed as commanded
• Cruise control may not engage or may stop working
• Check-engine light may come on

How to diagnose it

1. Check freeze-frame data and related cruise-control codes to see when the coast signal became implausible.
2. Use scan-tool live data to watch the coast status while pressing and releasing the coast switch.
3. Inspect the coast switch or stalk and its connector for sticking, corrosion, loose pins, or damaged wiring.
4. Test the coast switch and circuit for a stuck contact, short, open, or intermittent connection using the wiring diagram.
5. If the switch and wiring test normally, check the receiving module input and grounds using the manufacturer's procedure.

Common fixes

• Free or clean a sticking coast switch if it can be serviced.
• Repair loose or corroded connections in the coast-signal circuit.
• Repair an open, shorted, or chafed coast-signal wire.
• Replace a failed cruise-control coast switch or stalk.
• Repair the related control module or its connections if testing identifies a module-side fault.

Can I keep driving?

Avoid using cruise control until the coast command behaves predictably. If the vehicle does not reduce speed as commanded, cancel cruise with the brake and control speed manually.