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  1. R

    Towing speed up 6% grade

    Look at the antifreeze concentration in your cooling system, then get the boiling point for that concentration on the internet. Then factor in the 15 lb pressure cap on the coolant system. That should give you a red line where your troubles may become very difficult difficult. The thing that I...
  2. R

    Lml stuck in high idle?

    Check your DTCs here: https://www.dtcdecode.com/Chevrolet/P2128
  3. R

    2015 LML P0483 Issue

    Maybe something helpful here: https://www.dtcdecode.com/Chevrolet/P0483
  4. R

    Towing speed up 6% grade

    Are you talking about I17 between Phoenix and Flagstaff? US 87 between Phoenix and Payson? Trying to better understand the roads you are talking about. I've driven both of those roads many times pulling my 12K 5th wheel and I use tow haul, 5th or 4th (or even 3rd) if someone slows me too much...
  5. R

    Fuel knock

    Sure, give it a try. If you have the ability to read balance codes, take a look there also. One may confirm the other.
  6. R

    Need some guidance

    See the attachment
  7. R

    Rocker arm assembly, torque specs

    This is for my LMM, not sure on L5P . This is for the rocker arm shaft bolts. I think that's what you mean https://my.alldata.com/ADAG/repair/ADConnect/v5/carids/44884/svgs/na-gc-721463_svg/?locale=en_US&region=Region_1 Tighten the bolts to 41 Nm (30 lb ft).
  8. R

    LLY Headgaskets/ studs and everything else I should replace...

    Maybe oil pump, higher capacity oil cooler.
  9. R

    help! locked up lb7 or is it transmission??

    Bad ground cable? Source: https://youtu.be/KoF5dHISkKY
  10. R

    05 LLY Baro wiring diagram

    Google 'gm upfitter 2003 electrical manual full size' and download the entire manual on a PC, not a phone. Note that the 2003 manual covers several years.
  11. R

    05 LLY Baro wiring diagram

    See attachment
  12. R

    LLY issue and Its been a long time [emoji1]

    Start by looking up those codes here: DTC DECODE and here: Chevrolet TSBs (Technical Service Bulletins) Lots of information in those documents
  13. R

    Transmission Dump-shifts, VATS Light On (truck runs and drives).

    Maybe there is something here that is different that what you have tried. https://blog.duramaxtuner.com/blog/how-to-perform-gm-vats-relearn https://www.dieselplace.com/threads/ot-gm-relearn-procedures-for-diesel-and-gassers-for-most-required-systems.684657/
  14. R

    Transmission Dump-shifts, VATS Light On (truck runs and drives).

    Look up your codes here: DTC DECODE and here" Chevrolet TSBs (Technical Service Bulletins) Make sure your batteries are fully charged and the cables are clean and tight.
  15. R

    OBDII Not Ready

    There are several specific monitors for the testing. See here for more information. If your truck fails, you should be told which monitor(s) failed, not just that you failed. I know the link is specific to 1500s but the principles apply to all vehicles...
  16. R

    Electrical issues

    DTC DECODE https://www.gmupfitter.com/wp-content/uploads/2021/05/2006_LD_CKFullSizeElectrical.pdf
  17. R

    Help Truck Won't Start

    This will help give you a more complete picture of what you need to understand. https://oregonfuelinjection.com/services-repair/diesel-diagnostics-repair/chevy-gmc-diesel-diagnostics/#11-high-pressure-cp4-pump
  18. R

    Service 4wd C0321 code

    some info for you
  19. R

    Fuel injector codes

    Do you know what those codes are telling you? Look here if you don't https://www.dtcdecode.com/Chevrolet/P2266
  20. R

    Service Trailer Brake System - 19 Denali

    Make sure fuses are good for starters
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