P0564 Fault Code

Cruise Control Multi-Function Input A Circuit

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0564 fault code specifically refers to issues with the Cruise Control Multi-Function Input A Circuit, which is crucial for the proper functionality of the cruise control system. This error indicates that there is a problem with the input signal from the cruise control system, which may affect the car's ability to maintain a steady speed without driver intervention.

• The cruise control system allows for maintaining a set speed without the need to hold the accelerator pedal down.
• The Multi-Function Input A Circuit is responsible for relaying important signals from the cruise control switch to the engine control module (ECM).
• A fault in this system can hinder or entirely disable cruise control capabilities, affecting driving convenience and safety.

What are the symptoms of the P0564 code?

Drivers experiencing the P0564 code may notice:

• The cruise control system failing to engage or operate correctly.
• Inconsistent or erratic behavior in maintaining speed while cruise control is active.
• Warning lights on the dashboard indicating a problem with the vehicle’s cruise control functionality.
• Unusual acceleration behaviors, especially when attempting to set or maintain speed.
• Difficulty in switching between different driving modes.

What causes the P0564 code?

Several factors can trigger the P0564 code, including:

• A faulty cruise control switch that is not sending accurate signals.
• Wiring issues such as short circuits or open circuits in the Multi-Function Input A Circuit.
• Corroded or loose connections that disrupt the electrical flow.
• A malfunctioning engine control module (ECM) that inaccurately interprets the inputs.
• External factors like weather conditions affecting the circuitry.

How to fix P0564?

To address the P0564 code, follow these recommended steps:

• Perform a thorough diagnostic to confirm the fault code and identify related issues.
• Inspect the cruise control switch for functionality and replace if necessary.
• Check wiring and electrical connections in the Multi-Function Input A Circuit for shorts, breaks, or corrosion; repair any identified issues.
• Ensure the ECM is functioning correctly and update or replace it if required.
• Clear the fault codes after repairs and conduct a test drive to verify that the cruise control system operates properly.