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Engine brake high rpm???

BoatGuyNY

BoatGuyNY

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I am new to engine brakes. Towing 8000# travel trailer yesterday for the first time. Tow/Haul on, engine brake in smart"auto" mode. All went well but as I neared the bottom of the hill to the stop sign the last down shift seemed to increase rpm to a crazy level. Shame on me, it took my by surprise and I didn't look at the tach. Heading out on my first trip next week and will be towing about 4000 miles. 2020 3500 Cummins HO, Aisin, Dually. Thank you
 
If you want less exhaust brake turn Tow/Haul off, but you will be on the service brakes harder.
 
You need to read the engine braking section on page 230 of the owner's manual. There are three settings, OFF/ON/Auto. Being you were in Auto, it only prevents increasing speed, like when cruise control is on and going down hill. "ON" will supply braking anytime the accelerator is not pressed.
 
Last edited:
RV_Goose said:
You need to read the engine braking section on page 230 of the owner's manual. There are three settings, OFF/Full/Auto. Being you were in Auto, it only prevents increasing speed, like when cruise control is on and going down hill. "" will spply braking anytime the accelerator is not pressed.
Click to expand...

fixed it for you
 
if you have it in tow haul amd are using the eb in auto, it will downshift and take it to almost redline, but it has never went over redline. this was towing a 10k lb bobcat.
 
RV_Goose said:
You need to read the engine braking section on page 230 of the owner's manual. There are three settings, OFF/ON/Auto. Being you were in Auto, it only prevents increasing speed, like when cruise control is on and going down hill. "ON" will spply braking anytime the accelerator is not pressed.
Click to expand...
I read it and it does do that. Just seemed like alot of rpms when it got to the bottom of the hill. Thanks for the reply!
 
BoatGuyNY said:
I read it and it does do that. Just seemed like alot of rpms when it got to the bottom of the hill. Thanks for the reply!
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I had to learn the auto function when I got my 2013 RAM 2500 diesel. I used the AUTO mode even when not towing.
 
BoatGuyNY said:
I am new to engine brakes. Towing 8000# travel trailer yesterday for the first time. Tow/Haul on, engine brake in smart"auto" mode. All went well but as I neared the bottom of the hill to the stop sign the last down shift seemed to increase rpm to a crazy level. Shame on me, it took my by surprise and I didn't look at the tach. Heading out on my first trip next week and will be towing about 4000 miles. 2020 3500 Cummins HO, Aisin, Dually. Thank you
Click to expand...

My 2019 threw me off the first time I towed and used the Tow/Haul mode. I am not sure if it is the difference from the 68/AISIN or the 2017 to 2019 but the AISIN seems to be more aggressive on the downshift - the tach will get around 2800 or so.

If I am in town towing I will turn off the tow/haul OFF as it is to aggressive for stop and go traffic for me.
 
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