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Jeep Cherokee, Grand Cherokee Cruise Control Problems



  • alby3alby3 Posts: 46
    fixed the vacuum hose under the battery compartment and fixed my climate controll switch and cruse control..... appreciate it.
  • klot95klot95 Posts: 1
    My 2006 Jeeps cruise control isn’t working. When I hit the button the set the speed the computer accelerates it to insane speeds. It won’t stay at one set speed.
    Also, when I turn the interior dash lights to a brighter setting they flash all the time and it’s very distracting. I have to turn the dimmer down very low where it’s sometimes makes the dash hard to see.
    Does anyone know how to resolve these issues? I’m assuming they both can be related maybe some with the computer?
  • mikeymmikeym Posts: 1
    I already checked the vacuum hose behind the passenger's side headlight, I'm still getting no vent control on my 2002 Jeep Grand Cherokee.

    That's until I saw the the main hose running into my intake manifold (at least that's what I think it's called), was totally rotted through! Needles to say, I have to replace it, but I'm not too sure what part number it is... I've included some links to some photos if anyone could help me out, or point me in the right direction.

  • smahimessmahimes Posts: 1
    I was wondering if you ever found the solution to this issue. I just bought a 06 Jeep Grand Cherokee Laredo yesterday and the cruise control doesn't work. Just like yours klot95. When I activate the cruise control, the vehicle jumps up to insane speeds and wont stop unless i turn the cruise control off. Does anyone know how to resolve this issue. Please help!!!!!!
  • Looks like your issue is more an environmental one, the line you pictured should not have anything to do with the problem as described. The line pictured appears to be a breather for the intake. I could be off, but it sounds like you have a vaccume leak elsewhere.
  • katz7katz7 Posts: 1
    My 2002 Jeep Grand Cherokee had exhibited the same symptoms you describe here. When I turned on the cruise control it would disengage a short time later. When it disengaged the cruise light would go out. The time it would take for the cruise control to shut down was intermittent. Some times I would turn it on and it would go right out. I could get the cruise control to light back up when I turned the engine off an back on. I checked the vacuum hoses and they looked good. I then took it to Jeep for an estimate. Jeep told me the problem was the PCM and it will cost me $850 to fix it. I paid $84.00 for this estimate.
    I purchased a PCM through Auto Computer Exchange. Installed it, drove the Jeep for about 2 miles and the cruise control shut down again. I returned the PCM and received credit with no hassles from Auto Computer Exchange. I read your post and replaced the BRAKE LIGHT SWITCH. It's been 2 weeks now and the cruise control has not failed one time. Before it failed daily. Thank you for taking the time to post your experience here. This forum has saved me $850 and then some.
  • 2004 4.7l v8 This was a $1.00 fix the dealership told me 100 to diagnose and possible 1000 to fix. The vacuume line comes out of the passenger side of the manifold. you have to remove the 4.7 l v8 plastic air intake piece and air filter cover at the top. the vacume hose is can be seen there it goes to the firewall then straight to the underside of the battery behind the headlight. Check the entire cable. The underside of mine melted near the engine due to heat. I cut outside the melted area then bought high pressure gas line and placed both ends of the original vacuume line into the gas line (1.00 an Oreillys). Cruise and Vents worked instantly and the gas line won't melt like that cheap [non-permissible content removed] ">. Let me know if you need any help.
  • I have a 2002 Jeep Grand Cherokee and have read thru all the threads and wanted to say thank you to all that posted. The Jeep Cruise Control in my case would cut out shortly after engaging and only would restart after shutting car off but still only worked for a few minutes and cut off. After reading all there was on this site I had all vacuum lines replaced...still had the problem. I than replaced the Brake light switch, a fix of $13.99 from AutoZone and low and behold cruise is working just fine. I realize if I had taken the Jeep to Dealer this would have been much more costly. This is not a hard repair to make I have a friend that installed the switch and took him all of maybe 10 minutes after reading instructions that came with the part. So here's an idea if you are having the same problems....thank you to all that posted!!!
  • Thanks for your post it really helped, I replaced the brake light switch and now cruise is working, fix of $13.99 from AutoZone!!!
  • halli_34halli_34 Posts: 1
    My 1999 GC is doing the same thing where is the vacuum hose located that was off??
  • christy25christy25 Posts: 1
    I have a 04 GC as well with the cruise out and the air only blowing out the defroster. We have changed out the line behind the headlight (it was split) we also changed out a line along the manifold also split. I dont know how to take out the battery tray can you advise? Im a woman so talk slow and specific :) Thanks!
  • Hi
    I am having issues with the cruise on my 05 GC.
    When I turn the cruise on the light comes on and then turns off. Then does not turn on again. Sometimes it will come on and work but most of the time it doesn't.

    Any ideas as far as different things to try?
  • I too was able to fix my cruise control by replacing the brake switch with one from Autozone only my cost was $15.02 because the Peoples Republic of California added tax :-(

  • jeepman64jeepman64 Posts: 2

    Vaccuum canister under the battery , check the vacuum line for cracks

  • wing2894 said:

    Hope this helps, I had the exact same problem with my 2001 Grand Cherokee, ((fan position switch won't work (go from floor to dash to windshield, etc.)), and the cruise control won't engage. I'm told both are due to a vacuum line problem, ). I fixed mine by replacing 1/4" hose located directly under battery mounting pan. Takes a little work but might be worth it.

    First remove battery. Then remove pan, you'll need a deep socket 10mm with extentions to get at one mounting nut. Remove two nuts holding cable to fuse/relay box attached to pan. Move pan out of way. The hose that's causing all the problems is about 6" long going to servo. Replaced hose ($.77) and it took care of both problems. Total job took about 1 hour. From what I have been reading this is the hose that's causing everyone problems.

  • I have a 2004 Jeep GC and does the exact same thing. Thanks for the info. I will try the hose problem if I can get someone to help me. My AC stays in my window and my cruise does not work either. Thanks!
  • I just purchased a 2005 jeep grand Cherokee with 80,000 miles. Driving to work this morning had cruise control set no problems. Hit the brakes to slow down no problem, hit resume and the engine died. Tried it again no problem the third time engine died. Any ideas?
  • jmc5383jmc5383 Posts: 2
    Greetings. I'm new to these forums so forgive me if this has been answered already. I have a 2002 Jeep Grand Cherokee Laredo and my cruise control has also stopped working. As in when I push the on/off button to activate the system the green cruise light on the dash doesn't light up. I've seen many comments to check the vacuum hose, check the break light switch to even checking the vehicles on board computer system. I've also read that if its a bad vacuum hose it will also affect the vent selector which is also a small issue. I select the vent to blow on my feet and instead it blows out of the defrost, etc, etc.
    I am hoping to fix this myself so I'm wondering where to start? Is it possible the cruise switch on the steering wheel itself has gone bad or should I be checking these other items first?
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