P0564

Universal

Cruise Control Multi-Function Input A Circuit

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Low Severity

The vehicle has detected a problem with the electrical input circuit for a cruise-control multi-function control. This circuit carries control requests, such as setting or changing cruise speed, to the vehicle’s control system. Cruise control may not work reliably or may be unavailable; some vehicles may show no obvious symptoms. The code identifies a detected circuit condition, not a confirmed failed part.

Report an error with this code

⚠️ Before You Begin (Safety First)

Do not rely on cruise control until the issue is diagnosed. If cruise control does not respond to its normal cancellation controls, use the brake and move to a safe place to stop; arrange service if normal control cannot be restored. Do not remove steering-wheel or airbag components for DIY checks.

Common Symptoms

  • Cruise control may not engage because the control system is not receiving a usable input.
  • Cruise-control functions such as setting or changing speed may respond inconsistently if the input signal is intermittent.
  • The cruise-control warning indicator or a diagnostic message may appear, depending on the vehicle.
  • There may be no noticeable symptoms apart from a stored diagnostic code.

Common Causes

  • A fault within the cruise-control multi-function switch or its electrical contacts.
  • Damaged, loose, corroded or poorly connected wiring or connectors in the input circuit.
  • An open, short or high-resistance condition in the circuit, depending on the vehicle’s circuit design.
  • A fault in the receiving control system, considered only after the switch and circuit have been checked.

Diagnostic Steps

  1. Check the owner’s manual for the vehicle’s cruise-control operating and cancellation instructions, then avoid using cruise control while its response is uncertain.
  2. With the vehicle parked safely, inspect accessible cruise-control buttons and nearby wiring or connectors for visible damage, looseness or contamination; do not remove steering-wheel or airbag components.
  3. Check whether other dashboard warnings or control problems are present and note when the cruise-control fault occurs; this can help distinguish an intermittent input issue from a broader electrical concern.
  4. If a compatible scan tool is available, record the stored codes and any relevant switch-input data without clearing codes before noting them.
  5. Have a qualified technician perform vehicle-specific circuit tests if the fault remains; do not replace parts based on the code alone.

When to Call a Professional

A technician can check for related codes, observe cruise-control switch input data while operating the controls, and inspect the relevant connectors and wiring using the vehicle-specific diagram. Electrical tests should confirm the fault before any switch or control module is replaced. Exact applicability and procedures depend on model, year and engine.

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Commonly Asked Questions

Does P0564 prove the cruise-control switch is defective?

No. The code reports a detected condition in the multi-function input circuit. The switch, wiring, connectors or receiving control system may need to be checked before identifying the cause.

Can I drive with this code?

The fault often affects cruise-control operation rather than basic driving. Avoid using cruise control until it works reliably, and stop safely if the vehicle does not respond normally to its cancellation controls.

Why might the code appear even if cruise control sometimes works?

An intermittent connection, switch contact or wiring problem can cause an input signal to become unreliable only at certain times. Scan data and circuit checks can help identify when the signal is lost.

Could the vehicle have this code without noticeable symptoms?

Yes. The control system may detect an input-circuit problem even if the driver has not tried to use cruise control or the issue has not affected normal operation.

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