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Tow / Haul Button Not Working '05

18820 Views 13 Replies 7 Participants Last post by  SixOhDriver
Anyone have problems with their tow / haul button?

When my truck was new it worked like this. When I pressed the tow haul button, nothing would happen until I pressed the brakes, then it would downshift (or come out of overdrive) and hold that gear. This was great for going down hills, etc..

About a week ago, this completely went away. The light still comes on, but when I hit the brakes or do anything, nothing happens.

Can anyone characterize how their tow/haul button works.

On my '96 F250, when I was on the freeway and pressed the tow/haul button, it would always come out of overdrive and stay their. And when I was going down a hill and the truck was just coasting, I would press the button, and then I would have to give it a tiny bit of throttle, then it would downshift and hold a gear enough to slow the truck down.

My 2005 acts a little different in that I have to press the brake going down a hill for it to downshift and hold the lower gear. But on the freeway, when I press the button, nothing has ever happened.

Anyway, it doesn't work at all now. Just curious how others tow haul work.

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OK. So if I am cruising on the freeway at 65mph and press the T/H button, should my tranny downshift? This has never happened even when the truck was new.

And when I am going down a hill lets say at 40mph and I press my T/H button, nothing will happen unless I tap the brake, then the tranny will downshift into the appropriate gear to hold me back. This just stopped working.

So what should I look for when cruising on the freeway to ensure my T/H is working.


[/ QUOTE ]

Your tranny should work close to this.
I just read the info in the link. It is different from what I experience.
I have a March 3rd build 2003. No reprograming. This is what I have.

No load, no fuel pedal coast down from 70 mph in Tow haul mode.
5th to 4th down shift locked tq at 55 mph.
4th to 3rd down shift locked tq at 45 mph.
3rd to 2nd down shift locked tq at 25 mph.
2nd to 1st down shift unlocked tq at 10 mph.

Load or no load down a grade, speed and lenght of grade dependent.
I can tap the brake pedal from a speed of 70 mph on a downn grade and get a downshift. The truck may or may not hold its speed depending on the steepness of the grade. If I need to slow the truck I apply the brakes and the tq stays locked and the truck slows. If I have slowed down to say 60 mph and take my foot off the brake and the truck starts to speed back up from the grade I can tap the brake again for another down shift. It seems that the down-shifts are RPM dependent as the programing won't over rev the engine.
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