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  1. Duramax Fifth Generation: 2011-2016 (LML)
    Hello everyone, I have a tuned and deleted 2011 gmc 2500 with around 180xxx miles, and recently I’ve been having an issue where the truck throws itself into limp mode randomly, it showed 2 codes, more than likely because I unplugged the MAF and MAP to check for connector/ sensor damage P0103...
  2. Duramax Fifth Generation: 2011-2016 (LML)
    I have a 2011 Silverado 3500 with an LML 6.6L Duramax. Truck has been def deleted with a basic tune, and has run flawless for the 3 years that I've owned it. Truck hit 300k miles last week, and developed a fuel knock while towing a vehicle back to my shop. It's throwing a fuel rail pressure low...
  3. Duramax Fifth Generation: 2011-2016 (LML)
    Hopefully, this won't ruffle any feathers here... Facebook Duramax groups were not helpful and honestly just rude. Just trying to find a correct serpentine belt diagram for my 2011 6.6 LML. It does have some aftermarket upgrades but none that should affect this. I've googled and googled and...
  4. Duramax Fifth Generation: 2011-2016 (LML)
    EDIT- 2011 2500hd LML 170k miles 5” straight pipe with Catalytic Converter, CAT fuel filter (on when I got it), CAI, and it has been deleted. Also my driveway is pretty steep uphill Started my LML up this morning, went to back out of driveway and it died after about 15 seconds. Tried to start...
  5. Duramax Fifth Generation: 2011-2016 (LML)
    When I attempt to activate my elevated idle, (fully press and hold the accelerator, then pump the brake three times within eight seconds) my dash is saying elevated idle off every time. For some odd reason it has worked when the weather has been warmer but recently with this blast of cold...
  6. Duramax Fifth Generation: 2011-2016 (LML)
    I have a 2014 LML 2500HD. On July 5th towing our 5th wheel back from Hershey I got a poor quality DEF reading. Since that time I have spent $2500 on parts and labor. Finally I get a call saying I need a diesel particulate filter. I agreed to go ahead with the service and was told that the part...
  7. Duramax Fifth Generation: 2011-2016 (LML)
    A crazy series of events has led me here. Last week, I had a warning light and “Exhaust Fluid Quality Poor” message. I added fresh DEF, and took my truck to a shop on Saturday to have a DPF Regen run & codes cleared. The truck ran great & my economy jumped back to 18MPG. Driving on the highway...
    lml
  8. Duramax Fifth Generation: 2011-2016 (LML)
    2013 model 210,000 miles I have been adding coolant for almost a year, just topping it off every few weeks. The past month ive had to top off every other day, truck ran fine and showed no signs of issues other than coolant getting low. Did multiple test with the coolant and the die and...
  9. Drivetrain - 2011-2016
    2015.5 LML, 85k miles. Last year, for the first time since the truck was new I noticed the STABILITRAK light coming on occasionally, especially when towing. Sometimes/frequently it would immediately be followed by SERVICE 4WD message. It seemed to get progressively worse and would come on when...
  10. Electrical
    I took this down to access some wires behind this panel. Place it back like it was before and now I get the service trailer brake system error message in the dash. Any ideas or advice on what to do/look at for corrective actions?
  11. Duramax Fifth Generation: 2011-2016 (LML)
    Hey guys ive got a 2015 duramax 3500 280000 miles ive had it for 3 years i think i paid 24 for it great truck but i think the fuel pump may have gone out and i understand that could be a 10000 dollar fix so should i fix it sell it part it out or what im open to most anything its always been a...
  12. Duramax Fifth Generation: 2011-2016 (LML)
    Hey guys first with this please be patient i have 2015 duramax the wif light came on so i went to the parts house got a new filter and before i made it home truck went into limp mode i think it runs fine but limited to 2000 rpm i changed filter very little water in it but i got p008 code low...
  13. Duramax Fifth Generation: 2011-2016 (LML)
    My 2016 has 32k on the clock. It is in for an oil change and they told me the rear main seal is leaking. This is the 2nd time. Is it time to unload this dog? Was it a incompetent technician the last time? Are they drying out as I don't drive it that much? I am really getting tired of GM...
  14. Suspension & Steering - 2011-2016
    I have 2012 gmc 2500 hd. My torrison bar is twisted in the key and the front bracket. I have a 6inch rough country lift. What do I need to replace
  15. Duramax Fifth Generation: 2011-2016 (LML)
    Hey guys, Unfortunately, I'm needing a bit of help.... I have a 2016 LML. Elected to go with the S & B 'wet' filter intake. I had ran the same brand/style on my 2009 Powerstroke and liked it. Long story short.. Having major issues. Towed my 26 foot travel trailer 3500mi over a 30 day period...
  16. Duramax Fifth Generation: 2011-2016 (LML)
    Out of the blue, my stock ‘15 GMC Duramax had a dead dash (no LED screen, no instruments), no nav and won’t turn over. Electrical door locks and head lights still work but that’s about it. The batteries and terminal connections are good. I’ve checked the fuses on the left side of the dash but...
    lml
  17. Duramax Fifth Generation: 2011-2016 (LML)
    2012 LML - Any ideas on what this leak could be? Fluid is brownish in color to the eye. Wiped it clean with a napkin and it’s yellow when wiped off. It’s completely odorless and oily to the touch. Hasn’t dripped too bad overnight but definitely enough to notice on some cardboard, have found...
  18. Suspension & Steering - 2011-2016
    My 2011 2500hd gasser has a big rubber bushing where the pitman arm attatches to the center link. It has a fair amount of play and I was wondering if the rubber bushing can be replaced or if you replace the whole center link. Not really sure how this thing comes apart as it is not just the...
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