Exhaust Brake - Dodge Cummins Diesel Forum
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post #1 of 61 (permalink) Old 10-11-2019, 09:11 PM Thread Starter
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Exhaust Brake

2019, 2500 4x4,towing a 25' travel trailer, The exhaust brake does not work in first gear no matter what the rpm's are. Does it work on anyone else's? Also this transmission seems to hunt 4-5-6 all the time in the hills towing. A lot of times it only holds 4 or 5 for only a split second, Can the dealer help that sort of thing? I frequently tow my trailer down a steep grade that is 5 miles long with a comfortable speed of 10-20 m.p.h. Just wondering.

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post #2 of 61 (permalink) Old 10-11-2019, 09:29 PM
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I would make an appt to the dealer. it should work down to 15 - 18mph then release.

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post #3 of 61 (permalink) Old 10-11-2019, 09:31 PM
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So you have an Auto?
No auto has a 1st gear TC lock up. So no exhaust brake in 1st.
5-6 hunting. Are you using tow haul? Lock out a gear if not.

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post #4 of 61 (permalink) Old 10-11-2019, 09:33 PM
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Originally Posted by elephantrider View Post
I would make an appt to the dealer. it should work down to 15 - 18mph then release.
Not in 1st gear it won’t.

If you have a 4wd use a front disconnect and utilize low range 2nd gear.
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post #5 of 61 (permalink) Old 10-11-2019, 09:49 PM
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when i'm shifting manually down to 1st, mine definitely stays engaged until it gets below 1600 or something
like that.. i'll have to pay more attention in the morning on the coffee run.

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post #6 of 61 (permalink) Old 10-11-2019, 10:15 PM
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Originally Posted by elephantrider View Post
when i'm shifting manually down to 1st, mine definitely stays engaged until it gets below 1600 or something
like that.. i'll have to pay more attention in the morning on the coffee run.
No unless you have some custom transmission, there is no 1st lock up.

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post #7 of 61 (permalink) Old 10-11-2019, 10:22 PM
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Originally Posted by Riverside Jeep View Post
Also this transmission seems to hunt 4-5-6 all the time in the hills towing. A lot of times it only holds 4 or 5 for only a split second...
3.42 gears?

Maybe if we start telling people that the brain is an app, they will start using it?

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post #8 of 61 (permalink) Old 10-11-2019, 11:55 PM
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Quote:
Originally Posted by Riverside Jeep View Post
2019, 2500 4x4,towing a 25' travel trailer, The exhaust brake does not work in first gear no matter what the rpm's are. Does it work on anyone else's? Also this transmission seems to hunt 4-5-6 all the time in the hills towing. A lot of times it only holds 4 or 5 for only a split second,
Can the dealer help that sort of thing?
I frequently tow my trailer down a steep grade that is 5 miles long with a comfortable speed of 10-20 m.p.h. Just wondering.
Greetings @Riverside Jeep
I'm no mechanic but here's what I learned from CumminsForum.con about exhaust braking. . .

* Torque converter must be locked for exhaust brake to engage.

* If engine speed drops below 1100 RPM exhaust brake will disengage.

* When slowing from highway speeds expect exhaust brake to (finally) disengage at about 17 MPH.

* Obviously run with Tow/Haul mode on.

Note:
I read a post here on CumminsForum.com a few months ago that the 1100 RPM exhaust brake dropout speed can be programmed down to 800 RPM.
I think it was an AlfaOBD thing. Use the search function for more info on that.

And Riverside Jeep, one last thing here...

I'd be real, REAL interested in hearing what the dealer had to say about this issue.
Honestly, I can hardly wait.

Please keep us posted.
Thanks,
-Ej-
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post #9 of 61 (permalink) Old 10-12-2019, 12:49 AM
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Quote:
Originally Posted by N of 60 View Post
So you have an Auto?
No auto has a 1st gear TC lock up. So no exhaust brake in 1st.
5-6 hunting. Are you using tow haul? Lock out a gear if not.
Yes. Noticed this on mine.

Exhaust brake will not engage when crawling down grade, at very low speeds.

As soon as the TC unlocks, your on the brakes.

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post #10 of 61 (permalink) Old 10-12-2019, 09:47 AM Thread Starter
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Originally Posted by N of 60 View Post
Not in 1st gear it wont.

If you have a 4wd use a front disconnect and utilize low range 2nd gear.
Would love to have a front axle disconnect, I used them all the time in the good old days of manual hubs. Could you imagine how long trans/rearends would last with some idiot with 840 lb/ft torque and a good load. I can see why they don't offer that anymore.
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post #11 of 61 (permalink) Old 10-12-2019, 09:48 AM Thread Starter
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Originally Posted by jimmy n. View Post
3.42 gears?
3.73
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post #12 of 61 (permalink) Old 10-12-2019, 09:56 AM Thread Starter
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Originally Posted by Drle View Post
Yes. Noticed this on mine.

Exhaust brake will not engage when crawling down grade, at very low speeds.

As soon as the TC unlocks, your on the brakes.
Seems that the the no lockup in 1rst gear is the culprit. I am in tow/haul with the gears locked out above 2nd,1rst gear has no exhaust brake and 2nd at that speed is in freewheel mode ( unlocked) so I'm on the brakes the whole way down.
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