When starting the truck, the tow haul light sometime comes on, and engages the transmission for tow haul mode. Hitting the tow haul button no longer engages or disengages the tow haul mode. when the tow haul light comes on, it might stay on for a while, then switch off. Intermitten on/off
SOURCE: 02 gmc allison tran. wont go into tow-haul mode
THERE HAVE BEEN ALOT OF PLOBLEMS WITH THE SHIFTER HANDLE/SWITCH. THE BEST WAY TO VERIFY CONCERN IS USE A DIAG. SCANNER & VIEW TRANSMISSION DATA DISPLAY WHILE ENGINE RUNNING. THE SWITCH IN THE SHIFTER IS FAULTY. IF YOU SEE NO INPUT CHANGE WHILE DEPRESSING SWITCH THIS IS YOUR CONCERN.
SOURCE: 2000 gmc yukon xl 4x4 wont engage
see my posting re this at my name: rlf107. $115 in parts and labor solved for me, on a 2000 Yukon XL
SOURCE: tow/haul light wont turn off
I have found that on three silverado's there is a plastic clamp on the bottom side of steering column where the wires become broken and can short out. You have to remove the column covers to see this, it should be claser to the lowe dash trim panel area needs a shifter to repair unless you can fix that little wire!
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