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cruise controls are dependent on the following sensors all working together
auto--vehicle speed sensor
fuse for the cruise control
cruise control switch either or all not working will stop the cruise control from engaging
road speed at which you can engage the cruise control has to be above a reset speed before it will cut in and work
that is normal for cruise, ( its goes dead, when there are other dangerous conditions, or jeep gets lawsuit like TOY did)
did you scan it yet.
that be first. (after checking fuses)
look for ABS failures. or Traction control)
or get car serviced?????? like oper guide stated, for this error?
cruise control best let garage check out,here are few things to check,check fuse and check to see if brake lights dont work.check brake light fuse if fuse okay brake light switch could faulty or bad connection then brake light will reset cruise control you apply brakes.if all is good problem could be speed sensor or accelerator pedal to ecm.you need diagnostic euipment to troubleshoot.
Ok, the '03 Jeep Grand Cherokee uses a small vacuum line to control the servos. Since your light comes on, it's obviously getting power. 9 out of 10 times it's the vacuum hose. Pop the hood and look on the passenger side towards the back for the engine coolant reservoir. It's most likely underneath it so you may have to remove the res. Check the vacuum hose and all vac. connections then check the electrical connections. If that's not the problem, check the cruise control connection to the throttle linkage. If that still doesn't do it, you may need use scan tools and diagnostic procedures that are out of the scope of home mechanics. Wish ya luck!
Sounds like you have a bad spark plug wire. Start the vehicle, then take a squirt bottle of water and spray around the plug wires. You should find it. It'll look like static around the bad one. Also you should get the misfire. You'll probably find a worn area on the wire. Best wishes to you.