P0564
Cruise Control Multi-Function Input A Circuit
Powertrain Speed/Idle Control Cruise Control Input 🟡 Moderate — Fix within a week
💬
What This Actually Means
In plain language — no jargon

Your cruise control button or stalk isn't sending a proper signal to the engine computer, like a remote control with a weak battery connection. The ECU can't read what you're trying to do with the cruise control.

⚡
Symptoms You May Notice
3 known symptoms for this code
Cruise control won't engage or activate
Cruise control buttons unresponsive to input
Check Engine Light illuminated
🔬
Embedded Systems Insight
What the ECU/ECM is actually computing

The ECM monitors the voltage signal from the cruise control input switch or stalk assembly. It expects specific voltage levels when buttons are pressed and released. If the signal is erratic, shorted, or open-circuit, the ECM logs a fault.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Cruise Control Switch Voltage 0-5V with defined steps per button press No signal, constant voltage, or out-of-range readings
Circuit Continuity Continuous with proper resistance Open or short circuit detected
🔧
Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Cruise control stalk connector
Disconnect and reconnect the cruise control switch harness; clean corrosion from terminals with contact cleaner.
2
Cruise control stalk wiring harness
Inspect the wiring between the steering column and ECM for pinches, cuts, or loose connections.
3
Cruise control switch/stalk assembly
Replace the entire stalk if internal contacts are worn or damaged and signal cannot be restored.