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Ron, ASE Certified Technician
Category: Chevy
Satisfied Customers: 35858
Experience:  35 years experience with ASE Certs
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07 trailblazer with tail gate open la, 2007 trailblZer, Yes

Customer Question

07 trailblazer with tail gate open la
JA: What year is your Trailblazer?
Customer: 2007 trailblZer
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes found loose latch left rear door. When rear tailgate door is open lock keeps cycling gm U1162
JA: Anything else you think the mechanic should know?
Customer: No more info did brain dead with battry
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the GM Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Chevy
Expert:  Ron replied 1 year ago.

Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

The code U1162 indicates you have Lost Communications With Lift Gate Module (LGM)/End Gate Module (EGM) and in order to determine the cause you are going to need to do some testing. I have enclosed the steps to do this in the link below.

See the wiring diagram in this link for reference as well.