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Old 01-03-2016, 10:08 AM   #1
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2012 Tundra Tow/Haul Switch

I tow a 2015 Vibe 27BHS with a 2012 5.7L Tundra 4X4. The owners manual for the truck says to use the Tow/Haul switch when towing heavy loads. However some people tell me to take it off Tow/Haul on Interstates or other high speed roads. Can someone tell me the best way to use this option? Thank you.

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Old 01-03-2016, 10:13 AM   #2
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Not sure how tow mode works on a Tundra, but on my Titan tow mode extends shift points in the lower gears to get you rolling easier. It does nothing in the upper gears. I have to turn off O/D manually...I would say to use it if the manual says to.


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Old 01-03-2016, 10:42 AM   #3
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Originally Posted by Neal H. View Post
Can someone tell me the best way to use this option? Thank you.
Yes. When towing, engage Tow/Haul and leave it alone.
Unlike older Tundras with overdrive (like my 2005), the Tow/Haul "alerts" the transmissions computer to analyze its inputs using a different set of computations. This results in altering up- and downshifts. It also allows the tranny to go into its highest gear, even when towing. Also, you'll notice the tranny responds to braking by downshifting more quickly.
Set it and forget it. That transmission knows more about its job than we do.
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Old 01-03-2016, 10:43 AM   #4
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I'd say your trailer is a heavy load. The Tow/Haul mode is there for performance and drivetrain longevity reasons. You should use it.
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Old 01-03-2016, 11:06 AM   #5
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I have a 2011 Tundra and use tow/haul mode when pulling my FW. Just for the heck of it I put it in tow/haul mode without pulling the FW just to see if it made any difference in fuel mileage. It had no effect I still got 17.5 mpg. When pulling around 10,000# to Florida I averaged 9.5 to 10.2 mpg. I guess because I was pulling down hill all the way. You should use tow/haul mode when pulling heavy loads.
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Old 01-03-2016, 11:49 AM   #6
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Have been towing @ 7000-7500 lbs for five years with a 2010 Tundra. Always use the tow-haul. It was put there for a reason.
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Old 01-03-2016, 12:04 PM   #7
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Biggest thing the tow haul mode does is help the transmission from over heating.
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Old 01-03-2016, 01:04 PM   #8
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Use T/H mode that's why the engineers put it there.

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Old 01-03-2016, 01:11 PM   #9
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engineers... that's funny.. you are talking about people who put spark plugs where you can't reach them, or filters in locations where you have to remove a transmission and separate the housing to get to it... engineers.. that's funny stuff.
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Old 01-03-2016, 01:28 PM   #10
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I tow a 7500+ Rockwood 8329SS w a 2013 Tundra and use the tow/haul in and around city towing but I shut it off on the highway. My measurements indicate a 2, to 2.5 mpg improvement without the tow/haul on the interstates.
The reason that is important is I make 2 1800 mile tows from Chicago to Phoenix annually and with a 26 gallon tank that reduces the stops and shortens the time.
I just read that they are going to 36 gallon tanks in new models & I wish I had that capacity.

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