My 1994 Chevy C1500 cruise control randomly engages and opens the throttle wide open. nothing will disengage it. Even cutting off the vehicle will not disengage it. When you crank it it is still stuck. This has almost caused an accident multiple times. I found out accidently that if I place the vehicle in park while stopped and then put it back in drive the resulting jolt will usually make it release. There doesn't seem to be any pattern to this happening. It some times will go weeks or even months with no issues and then it may happen several times in a week. What could be causing this and how do I fix it?
SOURCE: I have multiple problems all happen at once, brake
could be an earthing problem, somewhere along that system the ground wire is not earthing correct, that could be why they cannot find the issue when running diagnostic checks, may be loose wire touching the chassis when moving. check all the relays and fuses, terminals on battery, check for wires touching around the fuse box aswell
SOURCE: I have a 2005 Chevy
It could be the cruise control unit (module) itself as these do burn out. A malfunctioning BCM (body control module) could also cause this. You should also check to find out if your 05 Impala has a recall as there are some defective models.
SOURCE: Cruise Control does not work.
The cruise control can be disabled for several reasons, one is if the check engine light is on or if the speed sensor is inoperative.
SOURCE: Cruise control on 1996 Chevy Silverado won't hold speed
Possibly a broken wire in the steering column. Wires goint through the steering column for the cruise are so fragile when the tilt is used alot causing the wires to brake. Part is $70.00 through advance auto. Cheapest I've found if you order online.
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The On/Off switch
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The Resume/Accel switch
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The Set/Coast switch
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The TCC brake switch
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The stop lamp switch
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The throttle actuator control (TAC) motor
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The vehicle speed sensor
Cruise Control Engaged
The cruise control system will engage and adjust the vehicle speed based on the activation of the following cruise control switches:
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On/Off
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Resume/Accel.
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Set/Coast
The cruise control switches are located on the multifunction/turn signal lever.
The powertrain control module (PCM) monitors the signal circuits of the cruise control switches in order to determine when to capture and maintain the selected vehicle speed. The PCM uses the throttle actuator control (TAC) module motor in order to control the vehicle speed. For further information on the TAC System, refer to Throttle Actuator Control (TAC) System Description in Engine Controls - 4.2 L.
Ignition positive voltage is supplied from the 10 ampere HVAC 1 fuse to the cruise control switch via the ignition 3 voltage circuit. When the normally open cruise control On/Off switch is turned On, the switch closes and the PCM detects a high signal voltage on the cruise control on switch signal circuit. When the normally open Set/Coast switch is pressed, the switch closes and the PCM detects a high signal voltage on the cruise control set/coast switch signal circuit. To engage the cruise control system, turn the On/Off switch On and momentarily press the Set/Coast switch. The PCM will confirm that the cruise control enable criteria has been achieved. The PCM will engage the cruise control system and record the selected vehicle speed. The PCM sends a class 2 message to the instrument panel cluster in order to illuminate the cruise control indicator. Pressing the accelerator pedal, while the cruise control system is engaged, will allow the driver to override the cruise control system in order to accelerate the vehicle beyond the current set vehicle speed. When the accelerator pedal is released, the vehicle will decelerate and resume the current set vehicle speed. The driver can also override the current set vehicle speed via the Set/Coast switch and the Resume/Accel switch. When the cruise control system is engaged, pressing and holding the Set/Coast switch will allow the vehicle to decelerate from the current set vehicle speed without deactivating the cruise control system. When the Set/Coast switch is released, the PCM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the cruise control system is engaged, momentarily pressing the Set/Coast switch will allow the vehicle to decelerate at 1.6 km/h (1 mph) increments for each time that the Set/Coast is momentarily pressed, with a minimum vehicle speed of 37 km/h (23 mph). When the normally open Resume/Accel switch is activated, the switch closes and the PCM detects a high signal voltage on the cruise control resume/accel switch signal circuit. Activating and holding the Resume/Accel switch, when the cruise control system is engaged, will allow the vehicle to accelerate to a greater vehicle speed than the current set vehicle speed. When the Resume/Accel switch is released, the PCM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the cruise control system is engaged, momentarily activating the Resume/Accel switch will allow the vehicle to accelerate at 1.6 km/h (1 mph) increments for each time that the Resume/Accel switch is momentarily activated, with the maximum acceleration total of 16 km/h (10 mph) over the current set vehicle speed . Momentarily activating the Resume/Accel switch, after the cruise control system has been disengaged by pressing the brake pedal, will recall the previous set vehicle speed that is recorded in the PCM.
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