Cruise Control Multi-Function Input Circuit Malfunction
The P0564 code indicates a problem in the cruise control multi-function input circuit. This circuit includes the steering wheel switches (ON/OFF, SET/COAST, RES/ACCEL, CANCEL) and their wiring to the powertrain control module (PCM). The PCM detects an invalid or missing signal from these switches, often due to a short, open, or resistance issue in the circuit. This can prevent the cruise control from engaging or cause it to disengage unexpectedly.
01. Most Common Causes
- Faulty cruise control switch assembly
- Damaged wiring or connector in the steering column
- Corroded or loose ground connection
- Failed PCM (rare)
02. Symptoms You Will Notice
- Cruise control inoperative
- Cruise control light on dash stays on or flashes
- Cruise control disengages randomly
- No response when pressing cruise control buttons
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to read the code and check for additional codes.
Step 2: Inspect the cruise control switch wiring and connectors for damage, corrosion, or loose pins.
Step 3: Test the switch continuity with a multimeter according to manufacturer specs.
Step 4: Check the clock spring (spiral cable) in the steering column for continuity.
Step 5: If all else is good, test the PCM input circuit and consider PCM replacement.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is safe to drive, but cruise control will not function. The issue does not affect engine or transmission operation.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and switch replacement. If the clock spring or PCM is faulty, costs can be higher.