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Tow Mode keeps coming on by itself.

Tow Mode keeps coming on by itself.

Postby Baker.josh [OP] » Mar 15 2020, 11:21pm

03 Silverado 4.8L Automatic Trans

Im chasing down issues left and right with this truck. it had been doing this thing where the tow mode light would come on while I was driving but eventually it would go off. Anyways, I did an intake gasket due to a lean code. That fixed that. While I was in there I did the knock sensors. I got a knock sensor code. I returned them and got new ones. No more code. Now when I drive around the block it gets to a certain point and the tow mode comes on and it revs higher and doesn't shift up. Will not turn off. Please help before I set the truck on fire and roll it off a cliff.

Edit: I also put on a new throttle body. I did the new TPS procedure as required.
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Re: Tow Mode keeps coming on by itself.

Postby GBSierraSLE » Mar 15 2020, 11:32pm

Broken orange wires in the steering column. It is a common issue on those trucks. Very easy to fix.
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Re: Tow Mode keeps coming on by itself.

Postby Baker.josh [OP] » Mar 15 2020, 11:35pm

I saw that it was a common break on these. I just assumed I messed something up with all these repairs this weekend. I'll check the wire and hope it's just a coincidence it started doing it at the same time as this other crap.
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Re: Tow Mode keeps coming on by itself.

Postby JSDelaware » Mar 15 2020, 11:36pm

This is just a guess but,
given the age if the truck, I would suspect broken wires/cracked insulation on the pigtail connecting the shifter handle
to the steering column harness.

I may very well be wrong but, it should be easy enough to check the condition of the wiring by pulling
the dash bezel off and taking a look.
I'll bet if the insulation is broken on the shifter pigtail, those wires could contact each other intermittently and
command tow haul on just like when you press the switch.
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Re: Tow Mode keeps coming on by itself.

Postby Baker.josh [OP] » Mar 15 2020, 11:48pm

Guess what? Orange wire is broken. I'm going to ride around and make sure the wires dont ground out to see if this my problem. Fingers crossed.
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Re: Tow Mode keeps coming on by itself.

Postby Baker.josh [OP] » Mar 15 2020, 11:56pm

Didn't come on at all. Wire was grounding out on the metal under the steering column. Thanks fellas. Love this forum!
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Re: Tow Mode keeps coming on by itself.

Postby Rogerthat99 » May 23 2020, 12:47am

I have the same issue. The Tow Haul switch isn't working. I assume the wire is broke. How easy / difficult is it to change the shift lever?

2004 2500HD 6.0L.
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