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Old 02-16-2017, 04:27 PM   #1
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Towing Mode for Chev/GMC pickup

I have an RV trailer that weights about 6200 dry, and about 7000 lbs loaded. When I am driving on normal roads (not up and down grades/hills/mountains) is it best to still keep the automatic trans in the "towing mode" (by pushing the button in at end of the shifter)? I have hear mixed opinions, and of course I don't tow over 55 mph.
Thanks so much.
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Old 02-16-2017, 04:34 PM   #2
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Originally Posted by Slow but Steady View Post
I have an RV trailer that weights about 6200 dry, and about 7000 lbs loaded. When I am driving on normal roads (not up and down grades/hills/mountains) is it best to still keep the automatic trans in the "towing mode" (by pushing the button in at end of the shifter)? I have hear mixed opinions, and of course I don't tow over 55 mph.
Thanks so much.
I use the tow/haul anytime I'm pulling my trailer. I even us the cruise control when its nice and flat.
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Old 02-16-2017, 04:49 PM   #3
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I use the tow/haul anytime I'm pulling my trailer. I even us the cruise control when its nice and flat.
X2
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Old 02-16-2017, 05:11 PM   #4
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On GM vehicles, when tow/haul mode is selected, output voltage is increased to help charge the battery of the trailer (if there is a battery).
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Old 02-16-2017, 05:15 PM   #5
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Yep... if I'm towing/hauling, I use tow/haul mode.
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Old 02-16-2017, 05:20 PM   #6
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GM Tow Mode

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Originally Posted by f5moab View Post
On GM vehicles, when tow/haul mode is selected, output voltage is increased to help charge the battery of the trailer (if there is a battery).
Did not know that. Thanks! As others have mentioned, I also use cruise on the flats. Much more relaxing.
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Old 02-16-2017, 06:34 PM   #7
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As a GM tech, yes. It increases the line pressure in the transmission and increases shift time to aid in clutch apply and prevent any slippage from the load being applied.
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Old 02-16-2017, 07:07 PM   #8
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In other words...
includes improving acceleration performance during launches, reducing shift busyness, assisting brake performance and speed control during engine braking situations, and improving vehicle speed control while requiring less throttle pedal activity.

In general, tow/haul mode maintains lower gears longer.
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Old 02-16-2017, 07:08 PM   #9
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Originally Posted by gmmastertech1 View Post
As a GM tech, yes. It increases the line pressure in the transmission and increases shift time to aid in clutch apply and prevent any slippage from the load being applied.
Our Chevy 2500 HD with 6.0 gasser and 4.10 gears runs higher RPM's thru the gears, so I'm wondering if your recommendation is still the same given driving on flat roads here in Illinois and Missouri. We haven't had problems with transmission slippage, but don't want any either. I usually start out with the tow/haul button engaged and then take it out once up to speed.
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Old 02-16-2017, 07:15 PM   #10
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Read owners manual, then push the button!!!!!!!!!!!!!
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Old 02-16-2017, 07:37 PM   #11
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I have a Chevy 2500 HD diesel and the manual says to use tow/haul if transmission shifts a lot. Set cruise at 65 MPH and pulled my 10,000# FW from Richmond, Va to North Fort Myers, Fl. It didn't shift gears except when stop for fuel and to eat so I did not use tow/haul.
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Old 02-16-2017, 07:41 PM   #12
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Years ago GM manual use to say when to really use it. Now its up to the owners discretion based on road conditions. I only use it in really hilly conditions. When I'm on flat roads I never use it and never use cruse. Last 3 trucks I've driven this way with no issues. You can end up wasting fuel at times by using it when not needed. Later RJD
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Old 02-17-2017, 08:23 AM   #13
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always use it, it changes the shift points kinda like a performance tune, as another poster said it changes voltage output, why would you not want to use it ?
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Old 02-17-2017, 08:36 AM   #14
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I have a Nissan Armada with tow mode switch. The manual states to ALWAYS use when towing and NEVER use when not towing.
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Old 02-17-2017, 08:38 AM   #15
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Page 342 of a 2016 GMC/Chevy owner manual:
Tow/Haul is designed to be most effective when the vehicle and trailer combined weight is at least 75% of the vehicle's Gross Combined Weight Rating (GCWR).

See “Weight of the Trailer” under Trailer Towing.
Tow/Haul is most useful under the following driving conditions:

. When pulling a heavy trailer or a large or heavy load through rolling terrain.

. When pulling a heavy trailer or a large or heavy load in stop-and-go traffic.

. When pulling a heavy trailer or a large or heavy load in busy parking lots where improved low speed control of the vehicle is desired.

Operating the vehicle in Tow/Haul when lightly loaded or with no trailer
at all will not cause damage. However, there is no benefit to the selection of Tow/Haul when the vehicle is unloaded. Such a selection when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy. Tow/Haul is recommended only when pulling a heavy trailer or a large or heavy load.

Page 341
If charging a remote (non-vehicle) battery, press the Tow/Haul Mode button, if equipped, at the end of the shift lever. This will boost the vehicle system voltage and properly charge the battery. If the trailer is too light for Tow/Haul Mode, or the vehicle is not equipped with Tow/Haul, turn on the headlamps as a second way to boost the vehicle system and charge the battery.

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Old 02-17-2017, 09:39 AM   #16
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What year and transmission you have? the older ones its better to always use T/H mode.
The T/H mode button is nothing more than a change of a few setting in the PCM. From the factory, it will increase your line pressures causing harder feeling shifts, the RPM points are changed to keep from lugging the engine. So you will run a higher RPM before it shifts to the next gear, and will downshift sooner. TC lock up Speeds can also be different.
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Old 02-17-2017, 09:55 AM   #17
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Confused........

If the truck never shifts, then what is the 'hurt' with having the Tow Haul mode "ON"? IF it's "on" and it never shifts, then that's the same as having it off. But if it's "on" and it just might, maybe, on occasion that you haven't thought of, DOES shift, wouldn't that be better while towing?

??
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Old 02-17-2017, 10:09 AM   #18
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What year and transmission you have? the older ones its better to always use T/H mode.
The T/H mode button is nothing more than a change of a few setting in the PCM. From the factory, it will increase your line pressures causing harder feeling shifts, the RPM points are changed to keep from lugging the engine. So you will run a higher RPM before it shifts to the next gear, and will downshift sooner. TC lock up Speeds can also be different.
If you're talking to me, we have a 2002 Silverado and yes, it does have "harder feeling shifts" when the T/H mode is used. I've always wondered if this may be damaging the transmission, U-joints and/or rear end. Can I sleep better now?
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Old 02-17-2017, 10:10 AM   #19
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Call me crazy, but since it says "Tow/Haul", I simply turn it on when I'm towing or hauling a heavy load. Not sure why we need to make it more complicated than that?????
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Old 02-17-2017, 10:17 AM   #20
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If I have ANYTHING hooked to my hitch, the Tow/Haul mode is on.
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