David Krueger

Thank You, That helps alot. I'll see if any salvage yards have them. If not, I'll price them out.

First off, I am not happy with the mirrors on my 21 GMC sierra 1500. I hate "objects in mirror appear closer than they are" Who ever thought, that this would be a good idea to put on a truck used for pulling trailers. Absolutely can't judge distance when backing up. Next, what engineer thought that it would be a good idea to put the convex mirror on the drivers side, in the upper left corner of the mirror. The Mirrors are to small to begin with. Lets make them worse by putting the convex mirror in a stupid place. It belongs on the bottom. I'm thinking about replacing the mirrors with mirrors from a HD. They are available from salvage yards. I have a few questions about this before I start buying mirrors. I have a 2021 AT4 with a 3.0 diesel. About 36k miles. Love the truck. I am wondering if I go to the larger mirror, will it affect my fuel mileage? Will they bolt up to my truck? My truck has power folding mirrors, lights on the front side, and auto dim on the DS only. I was thinking about getting mirrors from a HD Denali . They have cameras in them, can my truck be programed to use the cameras? Will they fit on my truck? Has anyone else tryed this swap? Any advice would greatly apreciated.

There's a switch in the cab that turns off all of the interior lights. Find the switch and turn them back on. Owners manual will tell you where it is. It used to be on the dash left side of the steering wheel. I think that in my 21 Sierra, it's on the upper console by the rearview mirror.

I had a problem once with replacing parts, and the computer didn't read them or pick them up. The fix was to find the fuse that controlls the part and remove it for a bit. Same thing that disconect the battery does only the computer is still active. Turned the switch on and off, then put the fuse back in and start the vehicle. the computer found the new part and light went off. I don't know if this will work but it's worth a try. You will have to look in your manual to find the correct fuse.

www.car-part.com Searches salvage yards across the US

Check your anti freeze level. In the radiator not just the reservoir.

I have the wireless charger in my 2021 AT4 Over heating doesn't seem to be an issue because GM must have routed the AC through that part of the truck. When I pick up the phone it is actually cool. Issues that I have had is sometimes it doesn't work through my phone cover. Works very good on my newest phone.

First mark the plug with the wire color. Then if you push the wire hard into the plug, you can slide a pick into the top of the plug and bend the little clip that holds it into the plug and slide the wire out. When you put it back on the wires, make sure that the little tab engages with the plastic or the wire will slide back out. You might have to bend the tab back up a bit. Careful they can be fragile and break off.

www.autostopeliminater.com

Look up auto stop eliminater on this site. I put one in and it works great. Cost is about $100. About 1 hour to install. Comes with instructions. Plus they have a video.

You can try looking for parts at www.car-part.com This is a salvage yard search engine.

www.car-part.com Salvage yard parts look up.

Ok , I didn't know that, Thanks for the info.

Thanks for the link for the auto stop eliminator. I am going on a trip Friday so I think that I will invest when I get back. Thanks again.

2021 3.0 L TD AT4 I have a check engine light code P3196 " Intake Manifold Tuning Valve 2 Actuator Control Circuit Low Voltage" and code U067C . Not sure what that one is?

Try changing the tranny fluid. I had a 2017 Colorado. developed shutter shift at 50,000 miles. Dealer wanted to charge me $500 to change tranny fluid. Did some research and found the new fluid is Mobil 1 Synthetic LV ATF HP Dexron. Bought the fluid and took it to my local garage. total cost $185.00 Shutter shift gone imediatly. Do some research online. Find the correct fluid for your truck. Good Luck.

Currently getting 20-24 mpg on short trips and 26-28mpg on tirps over 40 miles. Towing my boat on a 3,000 mile trip averaged 18 mpg. Currently have 8,900 miles on the odometer. Tires are Bridgestone Dueler AT 275/60R20 Do you think that the mileage difference on a Denali is because the Denali's are full time 4wd. 2021 GMC AT4 3.0L TD

Don't know why it turned my pics upside down

I just bought a 2021 AT4. It replaced a 2017 Colorado with a 2.8 L TD. So the Colorado didn't have any kind of guage on the DEF tank. It was truely a guessing game. If you let the tank get low, the check engine light would come on. What a pain in the ass! So I was excited that my new truck had a guage. From past expierience, Yes you will deffinetly use more DEF when towing. So far I am seeing that the guage isn't very accurate but simply a guide. I filled the tank when I got it and I have the trip odometer set to see about how many miles that I can get on a tank of DEF. Just a starting point. I also get a message saying how many miles left on DEF. I recently towed my boat on a 3,000 mile trip and got 18 mpg average for the whole trip. I have noticed that the mpg is matched to the mph. At 60-65 mph I would get around 20 mpg, and at 70-75 mph I got 17 mpg.

Yes, It's happening to me all of the time. At least 3 times per trip. Allso does anybody know how to turn off the onstar message that comes up at every start up? I also want to permanently turn off the engine stop switch. Dave

Just Sold my 2017 Colorado with a 2.8L Turbo Diesel. It developed shutter shift at about 50,000 miles. My dealer didn't want to take care of the problem. " You don't have the transmition that is under a service update, It has a 75,000 mile warrenty though." So I did some research and found that the tranny fluid was mixing with condensation and ruining it's viscosity. Dealer said that it would change the fluid for $500! Nope! The fluid that I found on the internet that replaced the oem fluid is Mobil 1 synthetic LV ATF HP Dexron. So I bought the fluid and went to my local service garage. He did a tranny flush and put in the new fluid. Total cost $185.00. The shutter shift problem was gone instantly. Just saying maybe look in that direction before taking everything apart. I replaced the Colorado with a 2021 GMC Sierra 1500 AT4 3.0L Diesel. I am noticing some shifting irregulatitys. About 8,000 miles. Fuel mileage is about 21-26 MPG. Yesterday I noticed that my check engine light is on and mileage suddenly dropped to 15 mpg. So the mileage drop I think might be a regen cycle. My last truck did that and my mileage suffered a big hit too. I have a reader for the code so when I plugged it in it gave me a code P3196. and U067C Anyone know what those are? I have a guy that can figure it out but I hate bothering him because he is always busy. Thanks Dave