Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Thanks for asking your question. I will try and help you out.
Most often when the cruise stops working I find the clutch switch faulty or the return spring on the clutch pedal weak and not returing the clutch pedal all the way back up to close the switch. You could also have a faulty cruise control switch.
To confirm these. You would need to have a Servoce tool read the engine ECM.
Please reply back if you need more help or have more questions. I am happy to assist.
Thanks for the information.
If you have done that, it's not the spring or switch. But it could be the wiring that runs from the switch to the engine ECM. Or it could the the switch or wiring from the cruise control switches themselves.
Unfortunately the only way to confirm is to have the ECM read and see if it's recognizing the switches. I am sorry. I wish there was another way to verify and troubleshoot.
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Unfortunately the only other option is to start throwing parts at the truck until it's fixed. That can get expensive. I would rather have the ECM read so the problem can be pinpointed. It should only take a few minutes with a service tool to read the ECM. I am sorry. There is no other way to find the problem.
If that's the case you need to ask JA for a refund. This site offers a money back guarantee. I am only the expert that answers the questions.
I would not suspect the speed sensor. If it was faulty. You would have a yellow check engine light on and a code for the sensor.
It just reports to the ECM if it's in or out. The ECM uses this info for cruise control functions.