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  1. R

    Help: LMM intermittent tow/haul

    All the connectors and wiring look good. I went through the tcm and ecm data that I could watch and I think there is some parameter kicking the truck out oh t/h. If I put it in drive holding the brakes and get on the throttle about 1/4 down it will deactivate t/h, and go back into t/h when I let...
  2. R

    Help: LMM intermittent tow/haul

    Just drove it watching the t/h and 4 low on the scanner. T/h switched to inactive while 4 low stayed inactive, I was in 2 wd. The t/h going on and off seems somewhat related to going up or down hills, the engine being under load or decelerating. There is some moisture under the panel inside the...
  3. R

    Help: LMM intermittent tow/haul

    It will come out of tow haul and unlock the converter and shift up and then shift down and lock it again when it goes back into th. On the scanner under the tcm data it will show tow haul active then inactive.
  4. R

    Help: LMM intermittent tow/haul

    since the switch pulls the bcm wire to ground when pressed, I turned on tow haul and then unplugged the shifter under the dash to eliminate the wiring in the shifter. The light stays on and it still goes in and out of t/h. Is there anything in the ecm or tcm that can disable the tow haul?
  5. R

    Help: LMM intermittent tow/haul

    My LMM will sometimes go into tow/haul , sometimes it wont. When I hit the button the dash light will always turn on and off as it should. The truck will go in and out of tow haul while driving, the light stays on. I have pulled up the tcm data on my scanner while driving and tow haul will...
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