Question about 2003 GMC Yukon Denali

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Liftgate will not unlock on yukon - 2003 GMC Yukon Denali

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Check ECC 10 AMP fuse

Posted on Sep 06, 2008

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I had the same problem.  Took it in and they had to replace the rear door/cargo door actuator and latch to the tune of $400.

Posted on Oct 26, 2008

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SOURCE: 2004 Yukon liftgate fuse error code

Replace the ECC 10ma fuse on the driver's side fuse panel.
This happens to me periodically.

Posted on Aug 30, 2009

6ya6ya
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Posted on Jan 02, 2017

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1 Answer

I have a 2005 GMC Yukon that the rear hatch does not lock. Wouldn't be a problem but no manual key hole to lock it. Must be some kind of lock sensor. Is on the driver door panel or by the hatch?


The rear hatch locking is computer contolled .
The BCM also runs diagnostics on the liftgate lock relay control circuit and will set DTC B3825 as current and also send a Class 2 message to the DIC. The DIC will display REPLACE LIFTGATE FUSE to inform the driver that a fault has been detected in the liftgate lock circuit and that the liftgate is not locked. Faults that will set the DTC and cause the DIC to display the message could be any of the following:
• An open ECC fuse
• An open or short to ground in the liftgate lock relay battery positive voltage circuit
• A faulty liftgate lock relay
• An open or short to ground in the liftgate lock relay control circuit
• A short to ground in the liftgate lock actuator lock control circuit
• A faulty BCM

The liftgate lock relay supply and coil sides receive a constant voltage through the battery voltage supply circuit and the ECC fuse. The normally closed contact is connected to ground and the control side is connected to the body control module (BCM). A lock function will occur when a door lock switch activation, keyless entry lock transmission, auto door lock function or a liftgate lock function has been received by the BCM. The BCM will then ground the control side of the liftgate lock relay. This energizes the relay and allows voltage to be applied to the liftgate lock actuator lock control circuit. Since the other side of the liftgate lock actuator is connected to the normally closed contacts of the door unlock relay to ground, the liftgate will lock. When an unlock function occurs the BCM will ground the control side of the unlock relay and the rear doors and liftgate will unlock.
The power door lock system consists of the following components:
• The driver door module (DDM)
• The passenger door module (PDM)
• The body control module (BCM)
• The driver information center (DIC)
• The rear door lock switch
• The door lock relay
• The door unlock relay
• The liftgate lock relay--utility vehicles with liftgate only
• The reversible door lock actuators in each of the doors and liftgate
• LOCKS 20A fuse (rear lock/unlock relay supply voltage)
• ECC 10A fuse (liftgate lock relay supply voltage)

If i were to guess i would say you mite need a new lock actuator , but i don't guess . You could take the hatch inside panel off an check for B+ voltage for the lock actuation as someone pushes the switch . Or have it checked for codes .

Dec 21, 2016 | GMC Cars & Trucks

1 Answer

2007 yukon,lift gate will not open electrically or manually?


You should still be able to open itmanually? Unless the lock is not functioning. There may be a plastic plug that pops off on the inside of the liftgate panel so that you can open it. You have to remove the plug and then move the lever with a screw driver. All that being said most likely have some broken wires in the boot at the top of the liftgate where it connects to the body. These wires tend to break from constant flexing when the liftgate is opened and closed. Either way you have to get the liftgate open to inspect them

Feb 17, 2015 | 2007 GMC Yukon

1 Answer

My 2001 Yukon horn keeps blowing (security) off and on all night long. We have it unlock.


check the switches on each side of IP and in liftgate glass for looseness and proper operation.

Sep 14, 2011 | 2001 GMC Yukon XL

1 Answer

The liftgate will not unlock... using the unlock


you'll have to remove the panel from the inside. there must be screws to unscew and/or clamps holding it down. then you can access the latch and open it manually

Jul 05, 2010 | 2006 GMC Yukon Denali

1 Answer

Rear access will not unlock 2005 Yukon Denali


I found this URL on the internet http://www.chefseattle.com/blog/site-news/suburban-rear-liftgate-wont-unlock-how-to-fix/ that might fix your problem. Also consider doing my fix rear wiper how to tip for 2005 Tahoe before that fails, while panels are removed.

Apr 19, 2010 | 2005 GMC Yukon Xl Denali

1 Answer

My 2006 Yukon liftgate does not lock with the other doors. Can someone help me? Thanks!!


It is probably the actuator inside the tailgate. I found this URL on internet http://www.chefseattle.com/blog/site-news/suburban-rear-liftgate-wont-unlock-how-to-fix/ Although not your problem, it will assist you in panel removal and actuator repair or replacement.

Feb 24, 2010 | 2006 Chevrolet Tahoe

1 Answer

2004 Yukon liftgate fuse error code


Replace the ECC 10ma fuse on the driver's side fuse panel.
This happens to me periodically.

Mar 22, 2009 | 2004 GMC Yukon

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