The cruise control works off of a vacuum diaphram. It could be leaking or a hose to the diaphram could be leaking. There is also a rod from the diaphram to the throttle body that could have come loose.
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no year stated, wow. the first checks are not the CRUISE. they are: 1: all fuses good. 2: CEL lamp out driving, if not the PCM will in fact cut Cruise function ( preventing TOYOTA SYNDROME) 3: scan tool do a full PCM scan, got errors. got DTCs, bingo.
today cruise is the last to work, (a very serious safety issue)
check cruise control fuse and check the brake lights see if brake light working because the brake light switch will deactivate cruise control when brakes is applied.if brake lights dont work either fuse blowed or switch bad.if all is good have vechicle code scan because cruise control control by PCM and vechicle speed sensor and thottle actuator control motor.
My 2001 Lincoln ls cruise control will not work. Put in a new clockspring and that did not fix it. radio controls and horn work but the air bag light stays on continually after starting. The lights on the cruise side will go on an off -I have bought that part to replace but don't want to put on if that is not the problem.