P0564 — Cruise Control Multi-Function Input “A” Circuit #

Note: The description for DTC P0564 may vary depending on the vehicle manufacturer.

• Ford: Cruise Control Multi-Function Input “A” Circuit
• Chrysler/Jeep: Speed Control Switch 1 Circuit
• Toyota: CC Switch Input “A” Malfunction
• Honda: Cruise Control Main Switch Input Malfunction

Summary of DTC P0564 #

DTC P0564 signals a fault in the cruise control multi-function input “A” circuit, which is part of the system allowing the driver to set and adjust cruise speed. The cruise control system uses a set of switches—often integrated into the steering wheel or stalk—to send input signals to the Powertrain Control Module (PCM) or the dedicated cruise control module. When the PCM detects an abnormal or missing signal from the “A” circuit, it triggers this code and often disables cruise control functionality as a safety measure. While the issue does not usually impact basic drivability, it can be frustrating for those who rely on cruise control for longer trips. Early diagnosis is key to avoid further electrical complications.

Frequent Symptoms for DTC P0564 #

When P0564 is stored, you’ll typically notice one or more of these symptoms. Many drivers first realize something is amiss when cruise control fails to engage or disengage properly. In some cases, the Check Engine Light (CEL) will illuminate, and other cruise-related dash indicators may flash or remain off. The issue is generally confined to the cruise feature, but can occasionally signal broader electrical issues.

• Inoperative cruise control system
• Check Engine Light (CEL) illuminated
• Cruise control indicator not lighting up or blinking
• Inconsistent or erratic cruise control operation
• Some steering wheel buttons not responding

Probable Causes for DTC P0564 #

The majority of P0564 cases are traced to issues within the cruise control switch assembly itself or faults in the wiring connecting the switch to the PCM. However, other contributors can include blown fuses, damaged clockspring (the rotary electrical connector allowing signals to pass from the steering wheel), or rare failures in the PCM or cruise module. Here’s what technicians most often find, in order of likelihood:

1. Faulty or worn cruise control switch
2. Damaged or corroded switch wiring/connectors
3. Defective steering wheel clockspring
4. Blown fuse in the cruise control circuit
5. PCM or cruise control module malfunction

Step-by-Step Diagnostic Guide for DTC P0564 #

Accurate diagnosis starts with confirming the code and working methodically through the potential causes. A digital multimeter and a wiring diagram for your specific vehicle are highly recommended for this process. Always disconnect the battery before probing electrical parts.

• Step 1: Use a scan tool to confirm P0564 and check for related codes (especially B- or U-codes related to switch or communication errors).
• Step 2: Visually inspect all cruise control switches for obvious wear, sticking, or breakage.
• Step 3: Check the cruise control fuse and replace if necessary.
• Step 4: Inspect wiring and connectors between the cruise control switch and the PCM for corrosion, fraying, or loose pins.
• Step 5: Test the steering wheel clockspring for continuity and shorts (especially if other steering wheel buttons or the horn are inoperative).
• Step 6: If no faults are found, use the scan tool to monitor live cruise control switch data and verify proper operation as buttons are pressed.
• Step 7: As a last resort, test or substitute the PCM/cruise module if all external components check out.

Possible Repairs for DTC P0564 #

The precise repair depends on the root cause identified during diagnosis. Most issues can be addressed without advanced tools or major component replacement.

• Replace faulty cruise control switch assembly
• Repair or replace damaged wiring/connectors in the cruise control circuit
• Replace defective clockspring (often requires steering wheel removal and airbag precautions)
• Replace blown fuse with correct amperage unit
• In rare cases, reprogram or replace the PCM/cruise module (should be done by a qualified technician)

Is It Safe to Drive with Code P0564? #

Yes, but with limitations. Your vehicle remains drivable with DTC P0564 stored, as the cruise control system is considered a comfort feature rather than a safety-critical system. However, you will lose the ability to use cruise control until the issue is fixed. If you notice other symptoms like non-functioning horn or steering wheel buttons, you should address the issue promptly to avoid secondary safety concerns.

Vehicles Most Commonly Affected by DTC P0564 #

P0564 can occur on any vehicle equipped with an electronic cruise control system, especially those that use multi-function steering wheel switches. Based on workshop data, these makes and models see P0564 most frequently:

• Ford F-Series (F-150, F-250)
• Chrysler and Jeep SUVs (Grand Cherokee, 300C)
• Toyota Camry and Corolla
• Honda Accord and Civic
• Volkswagen Passat and Jetta
• Hyundai Sonata and Elantra

Common Mistakes & Best Practices for DTC P0564 #

It’s easy to misdiagnose P0564, especially if you skip steps or assume the most expensive repair is the solution. Here’s what to watch out for and how to ensure an accurate fix:

• Replacing the cruise control switch before inspecting wiring and fuses
• Overlooking a faulty clockspring, especially if other steering wheel functions are affected
• Neglecting to check for related codes that may help pinpoint the fault
• Failing to disconnect the battery when working around airbag or steering wheel components
• Best practice: Always use the vehicle’s wiring diagram and verify power/ground at the switch before replacing parts

Express FAQ for DTC P0564 #

Q: Can I reset the code and keep using cruise control?
A: Clearing the code may temporarily restore cruise function, but unless the underlying problem is fixed, P0564 will likely return quickly. The system disables cruise control for safety until the fault is resolved.

Q: Is replacing the cruise control switch difficult?
A: On most vehicles, replacing the switch is straightforward but may require removing steering wheel covers or the airbag. Always disconnect the battery for safety and consult your owner’s manual or a professional if unsure.