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P0565Cruise Control On Signal

The PCM has detected a fault in the cruise control On signal, such as the input reading on constantly or never registering.

Definition

The PCM monitors the cruise control On/Off switch input to know when the driver has armed the system. P0565 sets when that signal is implausible — stuck on, stuck off, or fluctuating in a way a physical switch cannot produce — typically from a faulty switch, clockspring, or wiring. The usual symptom is cruise control that will not arm (no indicator lamp) or that arms by itself; the system is disabled as a fail-safe. This is a convenience fault with no direct driveability or emissions impact, and the MIL usually does not illuminate.

Common causes

  • Faulty cruise On/Off switch (worn contacts or sticking button)
  • Worn clockspring interrupting the signal through the column
  • Open or shorted wiring between the switch and PCM
  • Corroded connector terminals in the column harness
  • Aftermarket steering wheel or switch installation errors
  • Faulty PCM input circuit (rare)

Common misdiagnoses

  • Cruise control module or PCM replaced for a bad switch
  • Brake switch replaced when the On signal is at fault
  • Vehicle speed sensor replaced for cruise-won't-engage complaints
  • Complete switch pack replaced when only the clockspring failed

Troubleshooting steps

  1. 1.Check the On input state on a scan tool

    Toggle the On/Off button while watching the cruise switch PID; the state should follow the button crisply with no bounce or stuck condition.

  2. 2.Test the switch itself

    Disconnect the switch and verify with an ohmmeter that the On position closes (or produces the specified resistance) and releases cleanly.

  3. 3.Check continuity through the clockspring

    Measure the circuit at the column base while rotating the wheel; intermittent readings implicate the spiral cable.

  4. 4.Verify the circuit to the PCM

    Confirm the signal wire is intact and free of shorts between the column connector and the PCM.

  5. 5.Confirm system operation

    Clear the code and verify the cruise indicator arms, sets, and cancels normally on a road test.

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