Medium and Heavy Trucks
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Hi my name is***** will be glad to try to help. Your thoughts on the clock spring are possible. What is the full model from the engine ID tag and what do you have logged in the ECM for fault codes?
Thanks for the update. i see you checked the switch status in Insite and they tested okay. Watch to see if any of these change and also your engine speed signal and VSS signal for your speedometer that would possibly cause cruise to fail. Click on this link for the ECM pinouts if you do not already have them to help identifying the ECM connector pins. If there are no problems with the switches, harness, or sensors then try updating the ECM software to reset everything and see if the problem still exists. Let me know