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Old 03-21-2016, 05:45 PM   #11
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I use manual mode on hills- up or down (2251- similar rig-6 spd). I try to keep the RPM in the 2500-3500 range. (even though peak torque is at 4200- I don't like to "scream" it)
I use tow/haul mode only when towing my utility trailer (25-2800 lbs) or my Tacoma- 4k lbs and manual setting on hills.
I don't like the computer telling me what to do.
I like to "feel" what is going on-motor/trans/throttle/brake.
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Old 03-22-2016, 03:46 PM   #12
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Bobby&Total Loss


Yes I am positive about “grade braking” working only with the cruise control on. The information under cruise control in the manual states this. It needs the “what speed” information to react to. And with this knowledge I tend to think that any new downhill roads that you do not know for sure it will handle would be a mistake to be relied on. I would use “m” and select the gearing as needed. The mere fact that if you apply the brake would shut off grade braking and up shift convinces me that I would not be happy with the results.

But using the tow/haul will certainly change shifting points and help on its own.

The “m” position allows you to select highest gear used and can reduce gearing on the fly. Just as Total Loss has stated. Plus giving his feelings about use and rpm’s. I really appreciate the information from both of you.
I am on my first big trip from NJ, and now am out in New Mexico. Will be experiencing some larger mountains soon with the new to me trans and wanted to touch base with some knowledge input about the Chevy six speed and appreciate your replies.
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Old 03-22-2016, 05:59 PM   #13
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I read the manual and it stated that in manual mode- the grade braking will not work.
But it is working if you are manually using the gear selector to aid in your descent braking by using the engine braking manually. You are doing it- not the computer.

I have that descent braking downshift in my company car also.
Gets annoying when it downshifts to a point of the engine screaming just by tapping the brake- IMO.
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Old 03-23-2016, 12:41 AM   #14
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the grade braking works with the cruise control off as well.
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Old 03-23-2016, 11:03 PM   #15
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Just use the gear that keeps you at the speed you want without over reving the engine. Typically I keep mine in 3 or 4th With a good brake controller the trailer brakes will keep enough drag to keep you safe. I try to keep my RPM between 2500 and 3500 if I can.
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Old 03-24-2016, 08:47 AM   #16
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Gets annoying when it downshifts to a point of the engine screaming just by tapping the brake- IMO.[/QUOTE]
Done it many times towing a fifthwheel - WHAT A THRILL !
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Old 03-26-2016, 05:28 PM   #17
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Grade assist

My tv is 2014 highcountry 1/2 ton with the tow package and tow FR evo 200rd. Still a newbie from S Cal. Only been out a couple times so far, but gone up and down a good grade by home. I haven't used the M mode and not sure I understand how it works. Can you just shift from D to M going 55 miles an hour? I due use tow haul when I am pulling my trailer. The grade assist does come on when going down and never use the Cruze control. Heading to S Dakoda June 4 for 3-4 weeks, so I imagine I'll learn a lot then. Do get lots of great information from this site.
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Old 03-26-2016, 05:58 PM   #18
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Quote:
Originally Posted by poorbuthappy View Post
the grade braking works with the cruise control off as well.
That's correct; at least it is for my 2015 Silverado 1500. Now if this is true for a MOTORHOME? Not sure. But on the trucks it engages without cruise.

However, there are different grade braking modes and that might be the misunderstood part;

One is "Normal Grade Braking," and there is "Tow Haul Mode Grade Braking," and then there is "Cruise Grade Braking System."

I believe that is why some say it only works in Cruise, and some, like me, says it works without cruise.

All page numbers are from a 2015 Silverado owner's manual PDF file.
From my manual..
Page 9-36/9-37
Normal Mode Grade Braking

If equipped with a gasoline engine
and an automatic transmission,
Normal Mode Grade Braking is
enabled when the vehicle is started,
but is not enabled in Range
Selection Mode.

To disable or enable Normal Mode
Grade Braking within the current
ignition key cycle, press and hold
the Tow/Haul button for
five seconds.

For other forms of grade braking,
see Tow/Haul Mode on page 9-39
and Cruise Control on page 9-57.


Page 9-40
Tow/Haul Mode Grade Braking

Tow/Haul Mode Grade Braking is
only enabled while the Tow/Haul
Mode is selected and the vehicle is
not in the Range Selection Mode.

For other forms of grade braking,
see Automatic Transmission on
page 9-34 and Cruise Control on
page 9-57.

Page 9-59
CRUISE CONTROL
While going downhill:

. Vehicles with a 6-speed
automatic transmission and a
gasoline engine have Cruise
Grade Braking to help maintain
driver selected speed.

Cruise Grade Braking is enabled
when the vehicle is started and
cruise control is active. It is not
enabled in Range Selection
Mode. It assists in maintaining
driver selected speed when
driving on downhill grades by
using the engine and
transmission to slow the vehicle.

For other forms of Grade Braking,
see Automatic Transmission on
page 9-34 ,Tow/Haul Mode on
page 9-39, and Hill Descent Control
(HDC) on page 9-56.

NOTE: DO NOT TRY THE HILL DESCENT CONTROL. Don't believe it will engage, but it is designed for off-road travel and used under 31 mph. I'm guessing if you push the button at 80 mph, the computer will ignore it...I hope.
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Old 03-27-2016, 02:43 PM   #19
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Quote:
Originally Posted by f5moab View Post
That's correct; at least it is for my 2015 Silverado 1500. Now if this is true for a MOTORHOME? Not sure. But on the trucks it engages without cruise.

However, there are different grade braking modes and that might be the misunderstood part;

One is "Normal Grade Braking," and there is "Tow Haul Mode Grade Braking," and then there is "Cruise Grade Braking System."

I believe that is why some say it only works in Cruise, and some, like me, says it works without cruise.

All page numbers are from a 2015 Silverado owner's manual PDF file.
From my manual..
Page 9-36/9-37
Normal Mode Grade Braking

If equipped with a gasoline engine
and an automatic transmission,
Normal Mode Grade Braking is
enabled when the vehicle is started,
but is not enabled in Range
Selection Mode.

To disable or enable Normal Mode
Grade Braking within the current
ignition key cycle, press and hold
the Tow/Haul button for
five seconds.

For other forms of grade braking,
see Tow/Haul Mode on page 9-39
and Cruise Control on page 9-57.


Page 9-40
Tow/Haul Mode Grade Braking

Tow/Haul Mode Grade Braking is
only enabled while the Tow/Haul
Mode is selected and the vehicle is
not in the Range Selection Mode.

For other forms of grade braking,
see Automatic Transmission on
page 9-34 and Cruise Control on
page 9-57.

Page 9-59
CRUISE CONTROL
While going downhill:

. Vehicles with a 6-speed
automatic transmission and a
gasoline engine have Cruise
Grade Braking to help maintain
driver selected speed.

Cruise Grade Braking is enabled
when the vehicle is started and
cruise control is active. It is not
enabled in Range Selection
Mode. It assists in maintaining
driver selected speed when
driving on downhill grades by
using the engine and
transmission to slow the vehicle.

For other forms of Grade Braking,
see Automatic Transmission on
page 9-34 ,Tow/Haul Mode on
page 9-39, and Hill Descent Control
(HDC) on page 9-56.

NOTE: DO NOT TRY THE HILL DESCENT CONTROL. Don't believe it will engage, but it is designed for off-road travel and used under 31 mph. I'm guessing if you push the button at 80 mph, the computer will ignore it...I hope.

FWIW, the info in your Silverado manual is a bit different than the info in my 2012 Chevy Express Van manual. I don't know if the difference is due to upgrades over the years or in the vehicle type.
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Old 03-31-2016, 07:38 PM   #20
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Yes, there were changes between my 13 and 15. But again this last week I prove, at least to myself, there is grade braking WITHOUT cruise control on or in tow mode. Same place every time, coming down from Soldier's summit on Hwy 6.
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