cannot unlock tailgate - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 08-26-2018, 07:53 PM
gngtownsend gngtownsend is offline
Junior Member
2004 Chevy TrailBlazer LT EXT
Dark Gray Metallic 4.2L I6 4X4
Join Date: Feb 2015
Location: Illinois
Posts: 1
cannot unlock tailgate

Coming back from a trip, I tried to open the tailgate to load luggage. I have tried to unlock using the fob and unlock buttons on both front doors but with no luck. My trailblazer has rusted thru below the latch handle. Do you think this is electrical or mechanical? I can open the glass. Is there a way to get at the lock from inside?
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Old 08-26-2018, 08:47 PM
mddombrowski mddombrowski is offline
2006 Chevy TrailBlazer LT EXT
Summit White 4.2L I6 4X4
Join Date: Jan 2017
Location: Charlotte, NC
Posts: 195
Most probably electrical. Common problem with the TB if you search the forums for “Lift Gate Module”. How handy are you with electrical circuits?
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Old 08-26-2018, 11:12 PM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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2004 GMC Envoy SLT
Graphite Metallic 4.2L I6 4X4
Join Date: Sep 2014
Location: NY
Posts: 2,053
Since there is evidence of rust in the area, I say it is mechanical. The OP will need to access the mechanism thru the small access hole in the plastic panel and try to move the bell cranks to release the main latch. Once the liftgate is open, he can remove the plastic panel and inspect the latch mechanism.
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Old 12-08-2018, 05:42 AM
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hoslerg hoslerg is offline
Junior Member
2005 SAAB 9-7x
Black 4.2L I6 AWD
Join Date: Oct 2011
Location: Mount Pleasant, MI
Posts: 10
Same thing happened to me awhile back. I could hear the module “unlocking” from the fob but no dice when attempting to open the tailgate. I found a video on YouTube showing how to use the access hole on the inside of the tailgate to manually pop it open. Mine was rusted, not horribly but apparently enough. So I picked up a used actuator on eBay for about $35 with shipping and haven’t had an issue since. The install was 10 minutes total in the driveway.
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