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  1. 11-16 LML Duramax Powertrain
    My LML just went into lip mode. Here are all the P-Codes that it is giving me. I am not sure where to start, any suggestions? P0650 stands for “Malfunction Indicator Light (MIL) Control Circuit,” P0381 Glow plug operation will likely be disabled if a code P0381 is stored P2459 error code...
  2. 01-04.5 LB7 Duramax Powertrain
    02 Sierra 2500HD, first duramax I've owned and bought back in October 23'. Been really good, drove to wyoming from Colorado several times in all kinds of conditions, until recently she started hazing out the exhaust, I know that typically means injectors took a sh!t and was kinda prepared for it...
  3. 11-16 LML Duramax Powertrain
    I bought the truck on a deal because of the emissions issues, and it’s primary use is for the farm. It won’t see blacktop a day in its life. I’m looking to delete it rather than the 10k the dealer wants to fix/replace it all. Some people are saying you have to fix before you can delete, others...
  4. 04.5-05 LLY Duramax Powertrain
    On Going Issues With P2149, P0202, P0203 and P0208 codes. The problem started with the engine going into “limp” mode and throwing codes P2149, P0202, P0203 and P0208. I replaced the #2 pigtail and still had the problem so I swapped the FICM from another truck along with the filter head. It...
  5. General Discussions
    2007 GMC Sierra 2500 HD Classic, bone stock LBZ motor with 225,000 miles. Truck ran great until it had a front end collision 8 months ago. When the truck came back it started to have issues. We are now experiencing limp mode, reduced power mode and it is throwing a code P0106 for 5V Reference 3...
  6. 911 Problems Forum
    Hello all I have a 2016 lml fully deleted with ppei and I have been having an issue with random losses of power. You will be driving along and all of a sudden it just goes into a limo mode of sorts except it doesn't say limo mode it just turned into a gutless pile. It has no codes upon a code...
  7. 911 Problems Forum
    NEED HELP! I have asked multiple mechanics and searched forums and cannot find anyone with a solution. 2011 Silverado 2500HD LTZ, fully deleted and tuned, 180k miles. About a year ago I jumped in the truck and it wouldn’t go in reverse, the gear indicator just blinked under the “R” and acted...
  8. 07.5-10 LMM Duramax Powertrain
    A few months ago I had an issue with my truck. I bought a superchips handheld programmer and flashed a performance tune on my truck. I was pulling an empty trailer up a hill and there was a pop. I lost some power on the truck but no codes. It hasn’t really been right since. Then I had a positive...
  9. 04.5-05 LLY Duramax Powertrain
    Bought my first diesel about a week ago. 2005 gmc 3500 dually. My intention is to use it for towing our camper and motor sports trailer. Drove it 80miles to get it home all good. Now it's been home for a week and I can't drive it across town without it throwing a check engine and going into limp...
  10. 911 Problems Forum
    I have a 2003 Chevy Silverado 2500hd lb7 with Allison 1000. I believe my tcm is bad but can’t figure it out. It won’t show my gears hard shifts into gears and is in basically limp mode with no codes or anything. My cts3 scanner won’t let me relearn my trans or let me see or know anything about...
  11. General Discussions
    I have a 4wd lly stock except exhaust and a turbo mouth piece with a limp mode issue only in fifth gear and is getting a fifth gear ratio code between 70-75. 65ish if loaded. I’ve had it in three shops for a few months including the Chevy dealer. Everyone says transmission isn’t my problem...
  12. 911 Problems Forum
    Had a boost solenoid code ordered a kit with that and turbo vane sensor. Replaced everything was fine. Turbo sounds different when spoiling. When first start up and goes into high idle it kicks off for a second or two and back to high idle. When it kicks off the engine reduce power comes on then...
  13. 06-07 LBZ & LLY Duramax Powertrain
    I need some help with my pick up. Couple weeks ago my truck started having no power while accelerating, I was towing a trailer full of wood so nothing crazy and I had just hit 190k miles, next couple days it was in and out of that "limp mode" and then just stayed I did some research and found...
  14. 911 Problems Forum
    Posting for my father trying to get an idea if anyone else has experienced this. We have a 2002 chevy duramax and lately it has been going into limp mode when tow/haul is on and then when we plug into the computer it throws random codes, and there not always the same codes. We think it might be...
  15. 2020+ LM2 Duramax Powertrain
    My 2021 Duramax with 20K miles randomly gives me the "DEF tank empty" and threatens to reduce my speed. It usually clears itself after a few miles but did go into limp mode once. On that occasion I had the codes cleared and it was fine after a few miles. We are planning a trip to Alaska and...
  16. L5P TSB (service bulletins, recalls, updates)
    So I bought a used 2017 Chevy HC 6.6L Duramax a few months ago in Oct. Truck has ran great with no issues until about 3wk ago and I noticed a few times that my truck would almost "jump" into gear. I just drove my truck from Texas to Oregon and now the truck is having more issues. More...
  17. General Discussions
    I’m “almost” at a loss. truck info : 2011 Sierra Denali 2500 edge tuned and dpf deleted. location : MN Snowy and cold Replaced: transmission filters, NSBU switch all the stories short: Hooked up boss v plow. Plowed twice. Second time out, went in to limp mode sporadically. Pulled codes p0700...
  18. 11-16 LML Duramax Powertrain
    The other day, my truck threw a code for a bad NOx sensor #1. Triggered the "Service Exhaust Fluid System..." Countdown to limp mode warning on the dash as well. Cleared the codes, but the one for the sensor came right back immediately. Typical.... Ended up replacing the sensor for a nice...
  19. Gauges, Electronics and Wiring.
    Hi I'm new to the diesel community and just bought a 2018 Denali HD Duramax 11 days ago. To the best of my knowledge no one prior to my ownership has done anything to the motor, transmission or exhaust. Yesterday I was driving normally when every light possible came on. 4wd fault, ABS fault...
  20. 11-16 LML Duramax Powertrain
    I have searched and not found anything that helps my issue specifically. I have 2013 chevy 2500 LML, full delete with efi live from PPEI and upgraded TCM from Dans Diesel. Truck has 200K on it now and has started acting up intermittently with service stabilitrak/traction control and going into...
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