The P0564 code on your 2019 Audi Q5 indicates a malfunction in the cruise control multi-function input circuit. Modern cruise control uses integrated switches with multiple functions, and this code indicates a general problem with that input.
Multi-Function Cruise Controls
The cruise control stalk or steering wheel buttons combine multiple functions—set, resume, coast, accelerate, and cancel—in one switch assembly. The ECU receives different signals depending on which function is activated. P0564 indicates these signals aren't being received properly.
Q5 Cruise Control System
The 2019 Q5 features adaptive cruise control on many trims, using steering wheel-mounted controls. The system integrates with the vehicle's driver assistance features. Input problems affect all cruise control functionality.
Malfunction Causes
The multi-function switch may have failed. Clock spring in the steering column may be damaged. Wiring between the switch and ECU may be faulty. Connector problems affect signal transmission. Software or module issues can prevent proper signal interpretation.
Diagnostic Steps
Use Audi ODIS to monitor cruise control switch inputs when each button is pressed. Verify each function produces the expected signal. Check the clock spring continuity if steering wheel-mounted. Test wiring from switch to cruise control module. Inspect connectors for damage or corrosion.