Please HELP!!! I have a 2017 Silverado 1500 LTZ with a 5.3L. The truck has a 5" Rough Country Lift, 35x12.5x22 tires. Speedo has been recalibrated for the new tires and is within 2 mph per gps app.
Problem: No cruise control over 69 mph. The cruise control works at all speeds until you go over 69 mph then it literally shuts off. My tuner did show a code failure for the transmission temp sensor so I took it to the dealer and had that changed. I would have done the work but I have an extended warranty so let them fix and pay. All done and still no cruise fix. I have NO engine codes or sensor codes on my reader, neither did the dealer. At the current time the dealer has no idea what the problem may be and neither do I.
I also replaced both front wheel sensors just in case, no change.
Has anyone ever had this condition and have a fix or suggestion??
Lost and looking for help.
Bryan