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Posted on Jul 20, 2008

Transmission tow/haul mode

All of a sudden my tow/haul dash indicator is not functiong, it could be a bad bulb in the dash, or it could indicate a problem with the tow/haul transmission, Which is more likely

  • 4 more comments 
  • 7t7z Aug 17, 2008

    Tow/Haul indicator light won't light. To be quite honest I can't now and never have really been able to tell the difference between tow/haul and normal operation, so now I can't determine if it is just the light that's blown out or if I have a problem with the tow/haul function

  • SINGLETARY78 Nov 19, 2008

    TOW/ HAUL LIGHT NOT COMING ON.

    I DONT KNOW IF TOW/HAUL IS WORKING OR NOT.

    IS IT A TRANNY PROBLEM? HOW DO I DIAGNOSE A PROBLEM LIKE THIS?

  • Anonymous Mar 06, 2009

    I rest my arm on the shifter once in a while and here an arcing sound just wonder if it's a loose wire???????????/

  • Anonymous Mar 24, 2009

    My tow haul light won't turn on. I know the trans is not shifting when I hit the button. I checked all fuses and they are good. Is there a selenoid or something external that I could replace, or is this a trans rebuild? My truck is a 2000 silverado with a 5.3 liter if that makes a difference.

  • tamsalive Apr 29, 2009

    Same problem it started before having new trans instaled. The trans expert says its the botton if you find out how to chage it let me know.

    [email protected]

  • ralvarez44 May 11, 2010

    Switch to tow haul. Does the transmission pattern change slightly?
    Should delay shift to higher speed. If so, then tranny probably is working. Do you notice any other transmission problems?


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  • Posted on Jun 09, 2010
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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.

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  • Posted on Jun 20, 2011
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Tow haul light not working.

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Related Questions:

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2answers

How to fix my 2001 Chevy Tahoe tow/haul keeps coming on when not pushed. If I leave it unattended will it cause my transmission problems cause I just had to replace it

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
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What would cause my TAHOE TOW/HAUL mode to engage on its own?

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.
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