Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Normal Operation
The PCM sends a signal through circuit 151 (LB/BK) to the speed control switches, which passes through the clockspring. The return signal is sent through circuit 848 (DG/OG) and the clockspring.
| DTC Description | Fault Trigger Conditions |
|---|---|
| P0565 - Cruise Control ON Signal | A continuous DTC that may set when the speed control ON switch is stuck. |
| P0566 - Cruise Control OFF Signal | A continuous DTC that may set when the speed control OFF switch is stuck. |
| P0567 - Cruise Control RESUME Signal | A continuous DTC that may set when the speed control RESUME switch is stuck. |
| P0568 - Cruise Control SET signal | A continuous DTC that may set when the speed control SET switch is stuck. |
| P0569 - Cruise Control COAST Signal | A continuous DTC that may set when the speed control COAST switch is stuck. |
| P0578 - Cruise Control Multifunction Input A Circuit Stuck | An on-demand DTC that may set when the speed control switch circuits are open. |
| P0579 - Cruise Control Multifunction Input A Circuit Range/Performance | An on-demand DTC that may set when the speed control switch circuits are open, shorted to voltage or ground. |
| P0581 - Cruise Control Multifunction Circuit High | A continuous and on-demand DTC that sets when the speed control switch circuits are shorted to voltage or open. |
This pinpoint test is intended to diagnose the following:
- Wiring, terminals, or connectors
- Clockspring
- Speed control switch
- PCM
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.