Automatic Liftgate will not lock

[biorob]

I've got a 2008 Yukon XL. The automatic liftgate opens fine and lowers as usual. The problem is that when I push the liftgate button to close it lowers to the point of locking but just opens up again. I can physically lower the gate by hand and it stays shut.

Any thoughts or simple fixes?

 

[yates ™]

The latch might need adjusted.

 

[GM Customer Service]

biorob,

I'm sorry to hear of the issue with your Yukon vehicle. This may be a lift gate open switch signal circuit or a position sensor issue. These are just suggestions, they are not meant as a diagnosis.

I encourage you to consult with a certified technician for further assistance.

Louis
GM Customer Service

 

[biorob]

4 trips to the dealership and still not fixed. The lift gate switch and motor were replaced. Service dept. says it could be a "module".

 

[biorob]

Finally fixed. Bad module. GMAC Extended warranty to the rescue.