Cruise Control On Signal
Diagnostic trouble code P0565 indicates that the Powertrain Control Module (PCM) has detected a malfunction in the cruise control 'ON' signal circuit. The code is set when the PCM receives an irregular, missing, or out-of-range voltage signal from the cruise control switch when the system is activated.
This code does not affect the drivability or safety of the vehicle. It only disables the cruise control system, so repairs can be made at your convenience.
Common symptoms
- Check Engine Light illuminates
- Cruise control system is completely inoperative
- Cruise control indicator light on the dashboard fails to illuminate
- Inability to set or maintain a cruising speed
- Other steering wheel controls may malfunction (if related to a clock spring issue)
Likely causes
- Faulty cruise control switch
- Damaged, corroded, or loose wiring and connectors in the cruise control circuit
- Blown fuse related to the cruise control system
- Defective clock spring in the steering column
- Liquid damage to the steering wheel controls
- Faulty Powertrain Control Module (PCM) (rare)
What to check before replacing parts
Check the cruise control system fuses.
Look for: A blown fuse indicates a short circuit that needs to be traced before replacing the fuse.
Use a scan tool to monitor the cruise control switch PIDs.
Look for: Observe the scan tool data while pressing the 'ON' button; if the state does not change to 'ON', the switch or circuit is faulty.
Visually inspect the wiring and connectors related to the cruise control switch.
Look for: Look for chafed wires, loose connections, or corrosion, especially near the steering column.
Test the cruise control switch for proper continuity using a multimeter.
Look for: Lack of continuity when the switch is pressed indicates internal failure of the switch itself.
Test the steering wheel clock spring circuits.
Look for: High resistance or an open circuit through the clock spring indicates it has failed and is preventing the signal from reaching the PCM.
This page explains the generic P0565 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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