Faulty cruise control on/off switch or multifunction switch assembly.; Worn or damaged wiring in the cruise control switch circuit, especially at the steering column or pedal area.; Corroded or loose electrical connector at the cruise control switch or PCM.; Sticking or misadjusted brake pedal position switch that interrupts the cruise signal.; Failed clock spring (spiral cable) in the steering wheel, affecting switch signals.; Internal fault in the PCM or body control module (BCM) on vehicles where the cruise signal passes through it.

DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P0565

P0565Cruise Control On Signal

Q: What does code P0565 mean?

Cruise Control On Signal. P0565 means the powertrain control module (PCM) has detected an unexpected signal on the cruise control on circuit, typically when the ignition is on and the cruise switch is not being pressed. The PCM monitors the cruise control switch input and sets this code when the voltage on the signal circuit does not match the expected state for the switch position.

P0565 means the powertrain control module (PCM) has detected an unexpected signal on the cruise control on circuit, typically when the ignition is on and the cruise switch is not being pressed. The PCM monitors the cruise control switch input and sets this code when the voltage on the signal circuit does not match the expected state for the switch position.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

The cruise control system may not engage at all when you press the on button.
The cruise control may turn on but drop out intermittently while driving.
The cruise control indicator light on the dashboard may flash or stay off.
Often no symptoms besides the warning light, with cruise control appearing to work normally.
Other driver aids that share the steering column or brake pedal switches may act erratically.

Common causes, most likely first

Faulty cruise control on/off switch or multifunction switch assembly.
Worn or damaged wiring in the cruise control switch circuit, especially at the steering column or pedal area.
Corroded or loose electrical connector at the cruise control switch or PCM.
Sticking or misadjusted brake pedal position switch that interrupts the cruise signal.
Failed clock spring (spiral cable) in the steering wheel, affecting switch signals.
Internal fault in the PCM or body control module (BCM) on vehicles where the cruise signal passes through it.

How to diagnose and fix it

Scan all modules for related codes and record freeze-frame data to understand when P0565 set.
Inspect the cruise control switch and its connector for physical damage, corrosion, or loose pins.
Test the cruise control on/off switch with a multimeter for continuity and correct resistance in each position.
Check the brake pedal position switch adjustment and continuity, as a faulty switch can mimic a cruise signal fault.
Perform a voltage drop test on the cruise control signal circuit from the switch to the PCM to rule out high resistance.
If wiring and switches test good, substitute a known-good cruise control switch or clock spring to isolate the fault.
Clear the code and verify the repair by test-driving the vehicle and confirming the cruise control operates correctly.

Why P0565 is often a switch, not the PCM

A common misdiagnosis is replacing the PCM when the real culprit is a worn cruise control switch that sends an intermittent signal.
The brake pedal switch is part of the cruise control circuit on many vehicles, so a sticking brake switch can set P0565 even though the cruise switch itself is fine.
On some vehicles, the cruise control on signal is a multiplexed voltage on a single wire, so a poor ground at the switch can cause the PCM to see an implausible voltage.
Aftermarket accessories wired into the steering column or brake circuit can introduce voltage spikes that trigger P0565 without any factory component failure.
P0565 can be stored as a history code after a low battery or jump start, so always check if the code is current or pending before replacing parts.

Can I keep driving with P0565?

The vehicle remains safe to drive because cruise control is a convenience feature, but you should avoid using the cruise control until the fault is repaired to prevent unexpected disengagement or unintended operation.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.