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  1. General Discussions
    Thanks for reading. I have a 2015 GMC Sierra 2500HD Denali 6.6L duramax. Purchased brand new. Full delete within two weeks off the dealership lot. Afe 5inch exhaust, intake etc efi live custom tuned by local shop. 5inch lift kit. Cali wheels. Nitro tires. Only 30k miles on original engine...
  2. General Discussions
    Every time I change one of my batteries on my 2004 GMC Sierra 2500hd Diesel I start the truck with no problem but I lose some accessories. I use to disconnect my battery for a minute and it would be fine. Not this time. I tried disconnecting each connection and reconnect but no luck. Any ideas...
  3. General Discussions
    Has anyone done the CP3 swap to get that junk ass CP4 out of the truck? If so How Big of a Project Is It?
  4. 2020+ LM2 Duramax Powertrain
    Hey guys, Wondering what the stages are for the Emissions Derate. How many km/miles are you allowed to go at each speed reduction. Looking at getting a new AT4 but I do a lot of long trips to the mountains with my current truck (pre emissions) and that’s a fear of mine is it ruining a trip...
  5. Exhaust Videos
    2120 Chevy Silverado, 3500. dually. Pulling a fifth wheel when turning on the exhaust brake, it burns so hot it melted the front of my 5th wheel trailer. Know problem plenty new exhaust muffler shop had it in stock no problem $204 to fix
  6. General Discussions
    I have a 2016 2500 HD, got an alert a couple weeks ago about low def, put 2.5 gal in and on my way. Yesterday got an alert saying only 99 miles, thought wow that was fast, added another 2.5 gal. Drove 30 mi. No change, clock ticking. Thought maybe a sensor was bad, bought the attached sensor...
  7. 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...
  8. Maintenance
    Has anyone used this in their L5P? Did it help? Did it hurt? Thoughts? Thanks
  9. General Discussions
    Does anyone know if a air intake is worth it for better gas mileage and power? I have a 2020 Silverado 2500 diesel.
  10. 11-16 LML Duramax Powertrain
    I’m thinking about buying this truck, it’s a 2015 Chevy 3500hd CCSB, it has higher mileage, 200k, anything major I should make sure was replaced or check before buying?
  11. General Discussions
    What are your top 5 must have diesel performance parts?
  12. For Sale Section
    '19 Silverado 2500HD LTZ The only thing this unit does not have is the power sliding mirrors and sun roof. Otherwise fully loaded. B & W 5th Wheel Hitch S & B intake(increased mileage of 1 mpg plus) Short bed with tonneau cover Just under 28,000 miles with new tires Mileage will continue to...
    $65,000 USD
  13. For Sale L5P ECM

    Parts For Sale
    Factory New ECM, E41 from GM Ecm has no programming on this one. it will need to be programmed for your L5P or sent off to be unlocked. Call or text 850-819-8315
    $1,000 USD
  14. General Discussions
    So I recently bought a 2003 2500hd 6.6L duramax. I didn’t have problems in the beginning but then I noticed when decelerating there was a low wind down hum. (Don’t know if this is connected) Found out I was low on transmission fluid... REALLY low. It took a whole quart and still isn’t full...
  15. General Discussions
    I am curious to get feedback from the community. I purchased a new 2022 Silverado HD Duramax and it finally came in after months of searching and waiting for it in transit. Anyone who’s purchased a vehicle lately understands the troubles of that in itself right now. I went to pick it up...
  16. 911 Problems Forum
    Update: we figured it out... when the dealer replaced my cluster as part of the recall they gave me a bad cluster that eventually stopped working. Took it apart and the soldering was all messed up so I re soldered it and we are all good. I am currently fighting with the dealership about their...
  17. New Member Introductions
    have an 03 Duramax. Have been getting the error message "Range Shift Inhibited" when I’m driving down the road have to put it back in park until it decides to go into gear. I have had the tranny serviced and replaced the NSBU switch. It is still giving the error "Range Shift Inhibited" and my...
  18. 11-16 LML Duramax Powertrain
    I fuel up at a diesel pump at a Walmart gas station, drove approx 25 miles home then 5 miles to meet a friend. sitting with AC on, engine just stops and will not restart. this was on Thursday. Could not get a tow until Friday morning, took it to a local dealer. Dealer got to it on Monday and...
  19. 2011-2016 (Non Powertrain)
    Good Afternoon, I hope you are all doing well. My stock emissions-intact 15.0 LML has been tucked in storage for a few years due to a significant winter advisory and the truck has been there ever since to save money. I have been pondering the aforementioned idea to begin daily driving the solid...
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