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  1. R

    LMM missing

    Yes, I'd say you did find the break!
  2. R

    LMM: 911 need help

    If you need a new TCM, you will have to have it programmed (flashed). Any reason that the TCM should be so hot? Anything blocking airflow to the TCM? Clean the TCM if dirty. 140 degrees is the magic temp to set the code.
  3. R

    LML P20EE: SCR NOx Catalyst Efficiency Below Threshold Bank 1

    I'm interested in knowing what % of time the def failed the quality test, if you recall.
  4. R

    Loss of brakes when towing

    Before you start replacing parts hoping to discover the real problem/solution, buy one of these: http://www.amazon.com/Brake-Fluid-Tester-calibrated-fluids/dp/B005HVG4GQ Use it to see how much moisture is in your brake fluid. If it is 3% or more, you need to replace the brake fluid. If it's...
  5. R

    Loss of brakes when towing

    Braking systems depend on having a hydraulic fluid that does not compress and when brake fluid absorbs moisture, it does compress. When it compresses, little braking pressure is exerted on the brake discs/shoes. The brakes are said to fail. Brake fluid that has absorbed moisture boils that...
  6. R

    LMM: ECM P2510 ECM Relay code HELP!!

    From ALLDATADIY.COM Circuit/System Description The ignition relay is normally an open relay. The relay armature is held in the open position by spring tension. When the ignition switch is turned to the Run or Start position, current will flow through the relay coil. A wire connected to the...
  7. R

    2008 lmm p0090

    There are wiring diagrams in the builders manuals at: https://www.gmupfitter.com/pdflists/view/6 DTC P0090 Fuel Pressure Regulator Control Circuit Circuit/System Description High pressure fuel is regulated by the fuel rail pressure (FRP) regulator mounted on the fuel injection...
  8. R

    Ibc

    Check to see if your truck has been upgraded: TECHNICAL Bulletin No.: 09-05-22-004 Date: November 05, 2009 Subject: No "Trailer Connected" Message on Driver Information Center (DIC) at Startup When Trailer is Connected (Reprogram ITBCM) Models: 2007-2008 Chevrolet Silverado...
  9. R

    Help with P0571

    Circuit/System Description The brake switch signal circuit is a high voltage input to the body control module (BCM), engine control module (ECM), transmission control module (TCM), Power Take Off (PTO) module (if equipped) and Trailer Brake controller (if equipped). The BCM monitors the stop...
  10. R

    Ibc

    make a tester with a brake magnet (or head light) so that you know you have the proper resistance on the circuit. When you connect the tester, you should ge the 'TRAILER CONNECTED' message. If the tester doesn't produce this result, your truck has a problem. There is a programming update...
  11. R

    P0571 - new brake switch, new wheel cluster, now what?

    ALLDATADIY.COM is your friend. DTC P0571 00 Cruise Control Brake Switch Circuit Circuit/System Description The brake switch signal circuit is a high voltage input to the body control module (BCM), engine control module (ECM), transmission control module (TCM), Power Take...
  12. R

    Fuel cooler after cp3 conversion

    No return from the fuel injectors at all? Or just not thru a cooler? I had never heard this previously/
  13. R

    08 Duramax

    08 and 09 relatively good years. Only problem I've had was a coolant leak from the egr cooler.
  14. R

    LML OEM Trailer Brake controller vs Aftermarket?

    Increasing the gain does just that, increases voltage. You can check all the connections between the truck's main wiring harness at the back connection to your 7-way receptacle, the receptacle itself, the 7 way on your trailer, and all the connections there. Make sure all are bright and shiny...
  15. R

    ABS Wiring Diagram

    Pick your year - it's all there https://www.gmupfitter.com/pdflists/view/6
  16. R

    New owner

    I find many parts on Amazon or Rockauto.com. Lots of great vendors on this site are very helpful and also have good prices. A Magnaflow muffler does NOT mean that the DPR delete was done. The DPF is a separate device on the exhaust pipe and ahead of the muffler by abut 2 ft or so.
  17. R

    trailer brake light ???

    Has this problem been fixed? What was the fix?
  18. R

    LB7: Losing fuel prime when it's hot

    If replacing the fuel lines doesn't solve the problem, buy a completely new fuel head. This comes with new fuel filter and WIF also. Cost is in the neighborhood of $125 US. If that doesn't solve the problem, install a lift pump, either a nice pre-engineered unit or even a home-built model...
  19. R

    trailer brake light ???

    Just so that you are aware, there isn't a separate brake light that feeds back to the trailer. Look at a diagram of a 7-pin RV connector and you won't find a 'brake' light. The same circuit that makes each side flasher work also creates the 'brake' light - when both sides are on. If you have...
  20. R

    2011 LML Starter Replacement

    Not true. ROckAuto.com ACDELCO Part # 12638394 about $200 plus shipping, $172 shipped at Amazon.
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