Worn, dirty or faulty cruise control switch or steering wheel stalk; Damaged, corroded or loose wiring or connector in the switch circuit; Faulty clockspring (spiral cable) in the steering wheel, on models where the switches pass through it; Moisture or spilled drink contamination in the switch or connector; Brake or clutch pedal switch fault affecting the cruise control inputs, depending on model; Fault in the engine control unit or the module that reads the switch inputs; Poor earth or low supply voltage to the switch circuit.

P0564

Cruise Control Multi-Function Input A Circuit.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
5: AreaVehicle speed, idle control and auxiliary inputs
64: FaultThe specific fault in that area

What it means

P0564 is the generic SAE J2012 code for a fault in the Cruise Control Multi-Function Input A circuit. The control unit that manages cruise control monitors the signal from the driver's cruise control switch or switches, and it has seen a voltage or signal pattern that is out of range, implausible or stuck. Exact switch layout and which module monitors it vary by manufacturer and model.

Symptoms

Cruise control will not engage, set or resume
Cruise control cuts out unexpectedly or drops speed
Some cruise buttons work and others do not
Cruise control warning or indicator light on the dash
Engine management light may be on
Steering wheel buttons feel sticky or unresponsive

Possible causes

Worn, dirty or faulty cruise control switch or steering wheel stalklikely
Damaged, corroded or loose wiring or connector in the switch circuitlikely
Faulty clockspring (spiral cable) in the steering wheel, on models where the switches pass through itpossible
Moisture or spilled drink contamination in the switch or connectorpossible
Brake or clutch pedal switch fault affecting the cruise control inputs, depending on modelpossible
Fault in the engine control unit or the module that reads the switch inputsrare
Poor earth or low supply voltage to the switch circuitrare

How to diagnose

Read all stored codes and freeze frame data, noting when the fault set and whether any other cruise or brake switch codes are present
Test each cruise control button for function and see whether the fault is constant or intermittent
Visually inspect the switch, steering column area and connectors for damage, corrosion, moisture or signs of previous repair
Wiggle-test the wiring and connectors with the ignition on while watching live switch data for dropouts, if the system provides it
Check the brake and clutch pedal switches operate correctly and are adjusted properly, as these often interact with cruise control
Using the manufacturer's wiring diagram, measure the reference voltage, signal voltage and earth at the switch connector and compare with the specification for that model
Check the resistance of the switch in each button position against the specification, where the circuit uses a resistor ladder
Test the clockspring continuity if the switches are on the steering wheel, following the model-specific procedure

How to fix

Replace the faulty cruise control switch or stalk assembly
Repair or replace damaged wiring and clean or replace corroded connectors
Replace the clockspring if it is found to be faulty
Dry out and clean contaminated switches or connectors, and replace any that are damaged
Replace or adjust a faulty brake or clutch pedal switch
Replace or repair the control unit only after the switch, wiring and supply have been proven good

Can I keep driving?

Low severity

The car is generally safe to drive as normal, but cruise control will probably be unavailable. Book it in at your convenience, and check the brake lights work, as a related brake switch fault would need prompt attention.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.