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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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Old 08-02-2011, 04:26 PM
acenface21 acenface21 is offline
Junior Member
2005 GMC Envoy SLE XL
Pewter Metallic 4.2L I6 4X4
Join Date: Feb 2009
Location: Portland, OR
Posts: 2
Envoy dead battery almost everyday

I've got a 2005 GMC Envoy XL. It use to be that if it wasn't driven for a week the battery would die. Now the battery dies in less than 24 hours after being driven.

It does have an aftermarket head unit as well as an overhead DVD player, both installed by a 3rd party, through the dealer when it was purchased...so I don't know if the problem existed before.

Regardless, I've taken it to the dealer and they can't find any problems. I've taken it to an independant electrical shop and had it diagnosed. They can't find any drains or any other problems with it. I'm on the second new battery and it's just getting ridiculous.

Any known issues of this type? I can't find anything online...please help!
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Old 08-02-2011, 04:42 PM
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the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
Join Date: Apr 2005
Posts: 26,181
Classic parasitic drain. Sometimes the Onstar module won't go to sleep. It could be any of 15-20 modules.

How clever was the independent shop, and what level of drain did they detect and declare not to be a problem? Did they know they had to measure current coming out of the battery WITHOUT ever disturbing voltage going to the vehicle so the modules wouldn't reset themselves?

Did they keep it overnight to catch it in the act?

On our platform, you can't just yank the wire off the battery and insert a milliammeter in series with the wire you just pulled off. The temporary disconnection messes up the state of the vehicle and none of the tests are valid.
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Old 08-03-2011, 09:01 AM
sBoddie sBoddie is offline
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2005 GMC Envoy Denali XL
Carbon Black Metallic 5.3L V8 4X4
Join Date: Jan 2011
Location: NoVA
Posts: 21
Rear liftgate

We had a similar issue for quite a while. Check the rear liftgate (not the window). Pull the handle to open it... listen for the power release to click. Then shut the tailgate... listen for it to engage. THEN remote/keyfob lock.

Sometimes it gets stuck in the partial unlocked position and keeps cycling all night. We've gotten in the habbit of listening everytime somebody opens it. Happens most often when you close it then remember something else and open it again (like unloading luggage/groceries).

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Old 10-27-2013, 01:10 AM
laini30 laini30 is offline
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2006 Chevy TrailBlazer LT EXT
Cranberry Red Metallic 5.3L V8 4X4
Join Date: Oct 2013
Location: Oklahoma
Posts: 2
We have had almost the exact same scenario with our 2006 trailblazer. There for awhile, it would go dead after about a week of not being driven, which it had never done that before (had it for 3 years before). We changed the battery, we have taken it down to have the draw checked and everything was within normal range. They suggested that we buy a solar charger. Now, when it won't start, all the lights come on and when you turn the ignition key, it doesn't even click when you try to start it like it normally does when the battery is dead. All my husband did was touch the jumper cables to it and it started up immediately. We have been to a GM dealer and they have no idea what is going on because they can't find anything wrong. Now, it goes dead every day, and it's even worse with the cold weather at night. The one thing I have noticed and I have no idea if it is related, but the oil sensor went out and the foot pedal motor quit working about the same time this started to happen and there is a clicking noise in the back she we turn on the rear heat/ac...it sounds like something is flapping inside and it doesn't blow air for awhile. Someone told us that it might need a new computer module, but I really don't have a clue about this stuff.
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