I have changed out clutch and brake petal switches and cruse control multi function switch, per suggestions from other on line mechanics, with no changes in results.
Obviously there is a glitch in the electronic's somewhere an guessing as to what the problem mite be isn't going to fix it ! You should take it to a qualified repair shop that knows these systems an how to test then , hooking up a factory or professional grade scan tool an checking inputs to the module that controls it . All anyone on here can do is guess ( myself too ) . Testing the electrical circuits , scan data ,using a lab scope if need be . This system is all computer controlled ! Your vehicle has electronic throttle control ,do you know what that is ?
Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions at vehicle speeds above 40 km/h (25 mph). Steep grades may cause variations in the selected vehicle speeds.
The following are the main components of the cruise control system:
• The powertrain control module (PCM)
• The On/Off switch
• The Resume/Accel switch
• The Set/Coast switch
• The TCC/brake switch
• The stop lamp switch
• The throttle actuator control (TAC) module
• The Clutch Pedal Position (CPP) switch, if equipped with a manual transmission
The PCM will engage and adjust vehicle speed based on the information received from the TAC module via the UART serial data link. For further information on the TAC system, refer to Throttle Actuator Control (TAC) System Description in Engine Controls--5.7 L.
It could be that a software up data could fix the problem or a sensor is going bad !
Could also have DTC'S - diagnostic trouble codes ! An the check engine light won't come on for these .
DTC P0567
The cruise control resume/accel switch is an input to the throttle actuator control (TAC) module. The TAC module uses the cruise control resume/accel switch signal circuit in order to detect when the driver has requested to accelerate the set vehicle speed or to resume the cruise control system. The TAC module detects a voltage signal on the cruise control resume/accel switch signal circuit when the switch is applied. The TAC module sends a serial data signal to the PCM via the UART serial data circuit. This DTC sets if the PCM receives a serial data signal from the TAC module indicating that voltage is present on the cruise control resume/accel switch signal circuit for longer than 90 seconds.
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DTC P0568
DTC P0571
DTC P1574
This diagnostic test functions on the assumption that sudden decrease in a non-drive, wheel speed must be caused by a brake application. Non-drive wheel speed and stop lamp switch status are supplied to the PCM through serial data from the Electronic Brake Control Module (EBCM). If there is a 4 km/h (2.5 mph) greater decrease of non-drive wheel speed in 0.4 seconds and a transition of the TCC or extended travel contacts of the TCC brake switch without a transition of the stop lamp brake switch, DTC P1574 is set.
DTC P1575
Action Taken When the DTC Sets
PCM will set the stop lamp switch status to not applied.
• The Malfunction Indicator Lamp (MIL) will not illuminate.
• No message will be displayed
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