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Rear hatch won't open

Tiny
GMCMAN4387
  • MEMBER
  • 2006 GMC YUKON
Electrical problem
2006 GMC Yukon V8 All Wheel Drive Automatic

Just out of no where the rear hatch will not work what so ever. I cant get the lock to unlock with the wireless key and it has no entry for a key on the hatch. The glass also will not open or even make a sound. Now all of the other doors and windows on the other 4 doors work fine no problems what so ever. It sounds like a short to me but this suv is so new and well taking care of. Im leaning to maybe a faulty relay. The one box in the interior but no luck for door locks. Any help would be great.

Service writer, the ECC 10 amp fuse appears ok, would there be another fuse I could try. He Yukon is out of warranty.

ty for your time
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Friday, June 6th, 2008 AT 7:08 PM

27 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS


https://www.2carpros.com/forum/automotive_pictures/30961_yuk_1.jpg



You can check these. Swap them out with another fuse of the same to be sure. Same goes for the ECC.

You may need to manually open the liftgate to get at the components inside the door to check for wiring problems or bad connections. Check any harnesses that are bent on a tighter radius that will flex when the gate goes up and down.


https://www.2carpros.com/forum/automotive_pictures/30961_yuk1_1.jpg



https://www.2carpros.com/forum/automotive_pictures/30961_yuk2_1.jpg



https://www.2carpros.com/forum/automotive_pictures/30961_yuk3_1.jpg



From what I understand, the latches on these can be troublesome and should get lubricated. Granted I have not run into this problem on these at our shop.
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Friday, July 18th, 2008 AT 5:12 AM
Tiny
HANDSHAKE
  • MEMBER
  • 13 POSTS
Service Writer, I believe we are getting close, but no cigar just yet. The 06 Yukon does not conform to the Fig.10 diagram ( opening liftgate during electrical panel). It does have a pull down strap that the owner can use when closing the hatch. This strap uses a small hex head type screw. Upon removing this strap it makes it easier to pop out the bottom panel and expose all of the workings. Once you manual unlock the level you can utilize the push button for the glass or the level for the hatch. I sprayed the workings with WD-40 and noticed while using the remote lock the mechanism appears to wiggle. This tells me that it is not fuse related but more of a failure of the lock/unlock mechanism. Should I continue to track down electrical/fuse or does it also seem it is the lock/unlock mechanism. I may try to decipher uploading a picture if this will help. Thank you again, we are close. Handshake
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Monday, July 28th, 2008 AT 9:08 PM
Tiny
HANDSHAKE
  • MEMBER
  • 13 POSTS
Here is the picture of the mechanism......


https://www.2carpros.com/forum/automotive_pictures/212630_DSC01191_3.jpg

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Saturday, August 2nd, 2008 AT 8:26 PM
Tiny
SHAWNAMYLER
  • MEMBER
  • 2 POSTS
I am having the exact same problem. However, I was unable to remove the panel in fear of damaging it. Please let me know if you find a fix.
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Wednesday, August 6th, 2008 AT 1:39 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Does this look like what you have?


https://www.2carpros.com/forum/automotive_pictures/30961_lift_1.jpg



IF there is no noise at the actuator, then this is still electrical, other wise you would hear or see a reaction when the button is pressed.

Test for power at the arrows, I expect none. This is the flow chart:


https://www.2carpros.com/forum/automotive_pictures/30961_lift1_1.jpg



Check for power going into the actuator harness, IF present, I would expect the actuator to be bad.
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Wednesday, August 6th, 2008 AT 7:16 PM
Tiny
MIKESARAUER
  • MEMBER
  • 1 POST
  • 2007 GMC YUKON
  • 200,000 MILES
The rear hatch will open with remote or console button but the only way to close it is by hand. When it opens and after it stops moving it clunks fairly loudly has done it for a while so figured it normal. The latch clicks when either the remote or button are pushed but will not close by power only by hand.
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Hello,

It sounds like you have a lift gate power module that is going out but lets check the fuses first there are two. One is under the dash and the other under the hood. Here is a guide to help you and the fuse location with the wiring diagrams for the lift gate so you can see how the system works:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

I would check the module electrical connector for corrosion here is the location of the module as well.

Check out the diagrams (below). Please let us know what you find.

Cheers, Ken
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
HANDSHAKE
  • MEMBER
  • 13 POSTS
  • 2006 GMC YUKON
Electrical problem
2006 GMC Yukon V8 Two Wheel Drive Automatic

I too have a rear hatch problem. Rear hatch latch or rear glass will not open. HELP!
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Need to remove the interior panel and inspect the latch assembly, Im thinking a plastic connector broke and the rod wont release. Can you hear it make noise when you try to release it with the button?
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
HANDSHAKE
  • MEMBER
  • 13 POSTS
Yes, panels removed it sorta wiggles when I attempt to lock/unlock


https://www.2carpros.com/forum/automotive_pictures/212630_DSC01191_4.jpg

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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Try manually pulling on the cables where they hook to the mechanism to see if you can make them release the latch
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
HANDSHAKE
  • MEMBER
  • 13 POSTS


https://www.2carpros.com/forum/automotive_pictures/212630_DSC01195_1.jpg



The black arrow is able to be moved to lock or unlock the mechanism...the red arrow does not rotate when the button is pressed to lock or unlock...it does wiggle when the lock/unlock button is pressed.
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
2CARPRO JACK
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The two cables above the actuator, try moving them to se if the latches will release. Sounds like the lock actuator may be bad or the latch assembly (motor)
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
HANDSHAKE
  • MEMBER
  • 13 POSTS


https://www.2carpros.com/forum/automotive_pictures/212630_DSC01195_1.jpg



The black arrow is able to be moved to lock or unlock the mechanism...the red arrow does not rotate when the button is pressed to lock or unlock...it does wiggle when the lock/unlock button is pressed.[/quote:3eea8c8c94]

pulling the cables doesn't help. It appears that the lock actuator and motor are one piece. If this is so, then I might try replacing this assembly. Like I mention when you press the lock/unlock the lock actuator wiggles but does not engage.
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
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I understand that. Unhook the cables, I want to be sure that the latches arent keeping the motor from working
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
VILASSHEWALE
  • MEMBER
  • 4 POSTS
  • 2005 GMC YUKON
  • 1.5L
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 140,000 MILES
I have GMC Yukkon Denali 2005. I recently replaced rear hatch actuator. Actuator is working fine except it locks if I unlock the vehicle and unlocks if I lock vehicle. Please help me to resolve this issue.
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
HANDSHAKE
  • MEMBER
  • 13 POSTS
Done. Nothing. Its like the motor wants to turn the mechanism but won't. Sounds like we are getting close.
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
It sounds like you have the wires switched. (Polarity) Check that first.
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
2CARPRO JACK
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Sounds like abad motor, just be sure that it is getting a full 12 volts
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)
Tiny
VILASSHEWALE
  • MEMBER
  • 4 POSTS
I did not change any wiring when actuator was replaced. I will take your advice and change the polarity to see if that solved the problem.
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Wednesday, February 3rd, 2021 AT 4:06 PM (Merged)

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