The tow/haul switch swith does not move, but it does light up on the dash when starting

Tow/haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This signals the powertrain control module (PCM) to extend the length of time between upshifts and increase transmission line pressure. Cycling the tow/haul switch again disables tow/haul mode and returns the transmission to a normal shift pattern.

Would't trust it , take an have DTC'S - diagnostic trouble codes checked by a qualified repair shop with a factory or professional scan tool . Auto part stores can not check BCM code's .
DTC B2722

Tow/Haul Switch/Indicator Always On or Inoperative

Step
Action
Value(s)
Yes
No
1
Install a Scan Tool .
Turn ON the ignition, with the engine OFF.
Cycle the tow/haul switch while observing Tow/Haul Mode on the Scan Tool .
Does the Scan Tool display Active when the switch is first pressed, and then Inactive when the switch is pressed again?
--
Go to Intermittent Conditions in Engine Controls - 4.3 L or Intermittent Conditions in Engine Controls - 4.8 L, 5.3 L and 6.0 L
Go to Step 2

You need to have a diagnostic scan tool hooked up ,glitch in one of the control modules or a wire in the circuit shorting to ground ! probably something simple but hard to find ! With a factory scan tool they can check the input signal to the BCM ,PCM .
Tow/Haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This signals the powertrain control module (PCM) or transmission control module (TCM) to extend the length of time between upshifts and increase transmission line pressure. Cycling the tow/haul switch again, or cycling the ignition switch disables tow/haul mode and returns the transmission to a normal shift pattern.

run the fault codes
check for problem torque converter servo/ solenoid , VSS or TCM units

on shifter knob the switch is at the end. two wire are connect to it and they are cut inside column steering
i hope it help

No, the switch is powered from the transmission, and if the had no power, you would not move. If the light is not coming on, then there is something wrong, like you are in S instead of D.

could be the switch or modual.check wiring for worn through or earthing.

climb under the truck! on the drivers side of the trans in the neutral safty swith unplug it and look for rotted connectors! if so repair damage! second go to passengerside near the rear of the trans ull see a plate that s being held by 2 7 or 8 mm bolts remove plate ! behind the plate there will b another plug do the same! inspect for corrosion

The lever "pivot" has broken the wire leading up to the switch. Replace switch (I believe you must purchase the entire lever)

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!

Hi, the problem is when you are tilting the steering wheel all the way up it's putting to much tenstion on the wires that come outof your shifter that run to the tow/haul button. i am 99% sure your wires are disconected. rewire them and add some extra wire so next time there will be more slack in your wires.