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 > Tow/haul mode

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jimbo4UT

Stafford Virginia

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Posted: 08/30/20 05:41pm Link  |  Quote  |  Print  |  Notify Moderator

What to do? I was on a steep grade and tapped my brake and it downshifted from 3 to 2 and hit 6000 rpm. I still wanted to slow down more but could not hit the brake again as I was high on rpm already in second so I took it out of tow mode and hit the brakes hard then put it back into tow mode. Was that correct? What would have happened if I hit the brake in tow/haul mode from second to first gear with no room for more engine rpm?

Jim

Lwiddis

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Posted: 08/30/20 05:51pm Link  |  Quote  |  Print  |  Notify Moderator

“but could not hit the brake again as I was high on rpm already” What?

Leave in tow/haul mode. Don’t overthink. Use your brakes as required...slow way down, release brakes to cool, repeat. Read an article on downhill driving.


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Fisherman

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Posted: 08/30/20 05:59pm Link  |  Quote  |  Print  |  Notify Moderator

Have you read your manual?

Lwiddis

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Posted: 08/30/20 06:07pm Link  |  Quote  |  Print  |  Notify Moderator

I’ll bet not, fisherman.

Second Chance

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Posted: 08/30/20 06:23pm Link  |  Quote  |  Print  |  Notify Moderator

What tow vehicle? Is it diesel or gas? What kind of load are you towing? Give us something to go on, here...

I my case going down a steep grade, with a diesel and a six-speed transmission, I put the transmission in "Manual" mode and select the gear I want. I can then tap the brakes as needed to supplement the engine brake.

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Michelle.S

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Posted: 08/30/20 06:30pm Link  |  Quote  |  Print  |  Notify Moderator

If the TV is anything newer the computer should protect the motor from you. So no it shouldn't down shift again unless you have a 10K redline.
Sounds like you need more TV or less Trailer and to slow down before going down long grades.


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Nodaker

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Posted: 08/30/20 06:42pm Link  |  Quote  |  Print  |  Notify Moderator

Assuming the transmission and engine are working properly together, you can step on the brakes again to further slow down. It won't down-shift again into 1st until you're going slow enough to not exceed allowable rpm's.


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KD4UPL

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Posted: 08/30/20 07:00pm Link  |  Quote  |  Print  |  Notify Moderator

You were not correct. Leave it in T/H. Most vehicles I've driven (Chevys) won't downshift to 1st. No matter the vehicle the computers will protect it from over reving. Putting the brakes on further will not cause a downshift to "destroy the engine" rpm.
If I'm on a road I know I like to just use manual mode because I know what gear I need to be in for which hill. On a new route, just leave in T/H and apply brakes as necessary.

kellem

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Posted: 08/30/20 07:03pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like your dealing with a subpar tow vehicle struggling to slow the mass, honestly.

20 years towing in tow-mode and not seen those RPMS.

Perhaps a manual downshift to mitigate excessive racing of the engine.

JIMNLIN

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Posted: 08/30/20 08:14pm Link  |  Quote  |  Print  |  Notify Moderator

Tow/haul mode works in many different ways depending on vehicle brand/which tranny/which engine and a host of other criteria.
Need more input for a accurate shot of how your tranny can work.


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