GMC Hummer EV owners should take care when closing the Hummer EV’s doors if the vehicle loses 12V battery power. That includes if the Hummer EV’s 12V battery is no longer holding a charge, or if it needs to replaced or disconnected. If 12V battery power is lost, the window indexing feature will not work properly, and it’s possible that the top side of the window will come into contact with the sky panel and / or the front A-pillar applique, possibly resulting in damage.
Per a report from GM TechLink, the side windows on the GMC Hummer EV incorporate an indexing feature that will automatically lower the window a small amount when opening the doors. Once the door is closed, the window will automatically raise to its full up position. However, this feature will not function if 12V battery power is disconnected, and damage will likely occur if the door is forcefully slammed close.
To close a door with a side window that is fully raised without 12V battery power, it’s recommended that the top edge of the side window is pushed inwards as the door is closed, tucking the top of the window underneath the A-pillar applique and sky panel. With the side window in place, the door can be pushed closed and latched without damaging related components.
GM TechLink also outlines how to reprogram the windows after disconnecting the 12V battery. If a window’s express-up feature is not functioning, first close all the doors, then turn the vehicle on and partially open the window that requires programming. Next, close the window and continue to pull the switch briefly after the window is fully closed, then open the window and continue to press the switch briefly after the window is fully opened.
If the Body Control Module (BCM) detects that the window motor is not configured, DTCs B1956 55, B1957 55, B1958 55 or B1959 55 (Side Door Window Regulator Motor) will set and a message will display reading “Open, then Close the Driver Window” or “Open, then Close the Passenger Window”.
As a reminder, the GMC Hummer EV features GM Ultium batteries and GM Ultium Drive motors, while the GM BT1 platform provides the underpinnings. Production takes place at the GM Factory Zero plant in Detroit.
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Comments
LOL. More tech run way amok.
HAHA
This couldn’t get any better!!! The mighty Hummer off roader (maybe the biggest joke of it all) can’t even handle a dead 12V battery. What a waste of resources.
Most vehicles have issues with dead 12V batteries.
@theflew: Yes, but that’s not the issue at hand. It’s that IF it has a dead 12V battery, you are being told not to slam the door. So the mighty Hummer proves once again that it’s a turd and a very heavy turd.
If GM was smart, they would kill the entire Hummer line once and for all. Dedicate those recourses to the GMC Sierra and Chevy Silverado EV’s as well as building as many Equinox EV’s as they can build.
This is no different from any other vehicle with windows that have to adjust when opening and closing the doors. Many in GM’s and other lineups. Honestly it’s kind of weird that this is even a story.
Totally agree. Why is this even a story – or – why is it made to sound unique to Hummer. My C8, my wife’s Porsche 718, and her Z4 before that all do the same thing. Good heads up though !
I believe you need to re-read the story……. it appears the indexing feature on the HUMMER is different because if the window fails to index (go down slightly when the door is either opened -OR- closed the glass will hit the surrounding areas “top side of the window will come into contact with the sky panel and / or the front A-pillar applique”……….. Obviously, glass hitting anything is not encouraged or intended here! It appears that in this case “form vs function” may have initially won out! What I don’t understand, is how can an EV’s 12 volt battery ever really be an issue? I know they use a 12 volt to power some systems, but c’mon isn’t there some type of software that can temporarily utilize the main EV’s special “ULTIUM” battery modules to compensate and provide the 12 volt power supply to necessary systems, until the battery issue can be resolved ??? Why Not??
I think the window indexing feature is something common to many modern cars with frameless windows (mostly coupes and convertibles). I know my Camaro does this, as does my sister’s Tesla Model 3. When you close the door, the window goes up a bit to seal more tightly against the door seals to keep out more wind/road noises. When you open the door, it inches down a bit to allow you to open. If the battery is dead, you do need to use caution when opening/closing the doors to avoid damage.
I was thinking the same thing. My C8 has that feature as well. Never thought about what would happen if the battery went dead. Thinking they should send an across the board message stating that for all of their vehicles that have frameless door glass with the auto index feature. Just one of those things you don’t think about.
Makes me almost miss the trucks from the dark days of the 70’s and 80’s.
Drove a few where you could see light between the doors and body the fit/finish was so bad. But at least you couldn’t hurt those trucks by slamming a door!
Haha! This thing is an over 9,000 lbs pussycat!
Prius get out of my way or else!!!
One more reason not to get an EV
Why “not to get an EV?” Why not just this pig Hummer?
My Chevy Bolt has never given me any issues like this and I’ve driven it for one year and 13,000 miles and it’s been flawless. Nothing better than getting the equivalent of 189 MPG and charging at home once or twice a week.
“If the battery goes dead ……..”
You don’t have to ask, you know it’s GM .
I see why everyone wants to go to 48 volts… They need 36 volts spare when the first 12 volts go dead, as happens with most GM branded cars lately doing updates..
Munro not withstanding (I think he got into trouble by initially criticizing Tesla but now – bank account confirms that he has drunk his kool aid) who loves the Cyber Truck’s 48 volt innovation (supposedly), but I can’t see it.
The difference in wire sizes between 14 and 52 volts amount to maybe a few pounds and maybe $5 additional copper – seeing as all these module based cars could have their own overcurrent protection – certainly among heavier ’12 volt’ utilization equipment such as electronic ignitions, fuel pumps, electric steering, electric power assisted brakes, and bass-boost sound amplification.
Trivial users of electricity such as LED dome lights or tail lights where it is desired to just run the wire back to a fuse box or brake pedal switch or ‘body control computer’ have to maintain a minimum size for robustness anyway….
All the money spent on new non-standard voltages to my mind is beyond wasteful. Engineers at Cadillac for instance should try to make the ULTIUM battery system reliable… Or they can continue down their current path… In my own case I figure GM Corporate spent at least 1 month and at least $25,000 returning my 7,000 mile LYRIQ to me fully reprograming every module and realigning the long range radar after complete propulsion battery replacement, It is too expensive to have to do this to every vehicle sold.
GM tried a 36 volt system for a bit (they called it ’42’) but then other manufacturers came out with electric power steering systems fully operational on 12 volt systems, thus killing the main need for the project..