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  1. General Discussion
    Hey guys new here. Just bought my first diesel this past spring with just under 160k on the dash. It’s fully deleted and has the minimum PPEI tune on the truck. Studded head bolts. Recently noticed my overflow portion of my coolant tank had no antifreeze in it, so I followed factory instructions...
  2. Gauges, Electronics and Wiring.
    So I’ve got a 2004 chevy silverado LLY Duramax 2500HD and I had to put some new batteries in it. Well when I did it reset my truck and now it’s all in Spanish. Well I found the language settings but my enter button on the steering wheel does not work. All the other steering wheel controls work...
  3. Ride of the Month Contest - ROTM
    Here’s my ride. Y’all have an awesome day! God bless! 2018 GMC Denali 2500HD 4x4 McGaughys 7”-9”(set at 9 with torsion keys and Cognito upper control arms) Mickey Thompson Baja Boss AT 37x13.50 R24 Fuel 24” FF71 wheels Compustar Pro T13 remote start/alarm with proximity unlock Firestone...
  4. Towing & Hauling
    Hey everyone! Have a question. I wanna put my 2500 duramax to work and make some money but, I'm not to entirely sure if legally it can haul per DOT regulations regarding weight. The gvwr is 9900 lbs steer axles 5900 and the drives are 6200. Any help on the matter would greatly be appreciated
  5. General Discussion
    I got a 2004 Chevy Silverado 2500HD LLY when I’m in drive I have an obnoxious thudding noise coming from the passenger side. Only happens in drive and in park. Never in Neutral or Reverse. Even when I’m on the brake and in Drive it thuds. I need help. I have a fuel rail pressure sensor code...
  6. 11-16 LML Duramax Powertrain
    I’m looking to purchase a 2015 duramax from a used car dealership. During the test drive. The def quality poor message was displayed. The dealer assured me he would have to fixed before I buy the truck. He sent it to a service shop and claims they changed the whole def tank. Filter. And fluid...
  7. 2001 - 2007 (GMT800) Non Powertrain
    I don’t know if I’m posting this in the right place but any help with post/truck is greatly appreciated. This is my first diesel truck. I have an ‘01 Chevrolet Silverado 2500HD extended cab long bed Duramax/Allison, had for about a year and a half. I believe it’s the LB7. Upgrades/Mods Mishimoto...
  8. 11-16 LML Duramax Powertrain
    what’s up guys? I’ve got a 2013 duramax LML. Egr , def, and dpf all deleted. Recently blew the bellows on the y leg of the passenger up pipe near the blocker plate. Replaced the passenger up pipe with an aftermarket up pipe. After piecing everything back together, my exhaust sounds like a gas...
  9. General Discussion
    I have 2002 GMC Sierra 2500hd LB7 At idle it sits around 6-8psi and at driving speeds it sits 40-50 psi any ideas what it could be, oil level is fine, no blow by, no fuel in oil everything is good and truck is running really just curious if it has a mechanical oil pump or not, thank you for any...
  10. General Discussion
    Not as familiar with duramax but if I wanted to build an LMM from the image in this post would I need to even worry about anything with anything emissions wise And avoid it all? Or would it be easier to get an LBZ and put it in an LMM body?
  11. General Discussion
    If I wanted to put an LBZ into an LMM body what problems would I run into? What I can think of so far is the wiring harness? Any tips
  12. Competition
    I have a 2005 LLY GMC that’s completely stock except for an aftermarket exhaust system and a leveling kit, I was thinking to put it in the county truck pulls this year. But I have been hearing a lot of things about the tie rods bending and breaking, so I decided not to. But a friend just told me...
  13. Competition
    So I got a 2005 LLY duramax GMC and the county fair is coming up quick. I want to put it in the truck pulls. I’ve heard that they can be a little loose on the front wheel bearings. Is that true?
  14. 11-16 LML Duramax Powertrain
    Hey everyone, I’m new to the site and am having a PERE 01 code come up on my 2015 HD2500 Duramax 6.6L 4x4 I have about 110k miles on it. I erased the code and it seems to run fine, but now the code is coming up more frequently and puts it into limp mode. I can’t seem to find anything online...
  15. For Sale 2015 duramax

    For Sale Section
    2015 Duramax LT trim model crew cab standard bed (6.5’) All stock besides 33” tires and on board computer monitor (EDGE EVOLUTION CTS3) tuners included but have not tuned yet. 116k miles 2nd owner can provide car fax Maintained routinely and vigorously Great interior, front seats had covers...
    $38,500 USD
  16. 06-07 LBZ & LLY Performance Parts Discussion
    First of all I have a 2005 GMC Duramax LLY 6.6 2500 HD deleted EGR wanted to give you all the info needed. Truck was running fine then decided to change the headgaskets , they werent completely out but were going. Changed headgaskets . truck was unhooked from the battery for about 2 weeks. Again...
  17. 2001 - 2007 (GMT800) Non Powertrain
    My truck has left me stranded. I just replaced the coolant thermostat housing on my truck and had both batteries disconnected. Everything is plugged up but truck does not have power to locks, windows, key fob doesn’t work, heated seats don’t work, no dingers. Truck will start but will shut off...
  18. General Discussion
    Hello Everyone, I have a 2020 Sierra 2500 Duramax Denali, 27,000 miles. The DIC is showing the following two messages, (Service Emission's System, 175 mi Until 65 MPH Max Speed). The dealer picked it up and gave me a loaner vehicle. They called and said the DEF tank needs to be replaced...
  19. 2020+ (Non Powertrain)
    So my newish 2021 HD duramax has been making a bunch of brake noise for about a month but been too busy to deal with it. I called the dealership where I bought it and was informed that there is a service bulletin and pads will be covered under warranty after inspection. Although the pads are on...
  20. 01-04.5 LB7 Duramax Powertrain
    Hi Guys I was wondering what could be causing all of my door controls not to work. In the past month I have had a headache with my 03 lb7. I have bricked my pcm up and just got it back today. Plugged it in and everything runs fine. But I noticed that my aftermarket Pioneer radio had all time...
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