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06-10-2021, 07:06 PM
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#1
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Senior Member
Join Date: Sep 2010
Posts: 4,505
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SEE POST # 527 -DEF head derate emergency/temporary travel procedure
SEE POST # 527. With both Spartan and FL chassis experiencing derating and stop engine problems becoming either a tow or brake down this is what the trucking industry has come with. To assist diesel engine owners with an option when their coach gets a check engine light along with DEF codes there is a option that owners can do to allow them to either to continue driving or avoid a tow. This is option that I know some owners would like to know about and use. This procedure has been posted on irv2 Entegra forum and today I went under our 2018 London Aire on a Spartan K-3 chassis with the Cummins 605 to check the location of the speedometer disconnect, which is on all Cummins engines and shot two photos to show where this connection is located. It is located on the transmission on the DS (right) side. By disconnecting this speedometer sensor this will allow you to operate your coach to drive to location to repair DEF head or until the time the DEF heads are available with out being derated or shut down. With the speedometer sensor disconnected your coach will not have a speedometer. Some owners will not be interested in this emergency/temporary procedure, but I would, if the DEF head problem caused me to be broken down along the highway.
Newmar Man
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Tom/Teri 16031 NKK 117995 FMCA
18 London Aire 4531 Spartan K-3 605
97-04 LA 04-18 Essex 2018 London Aire
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06-10-2021, 07:34 PM
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#2
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Senior Member
Newmar Owners Club
Join Date: Dec 2015
Location: Wellington, Florida
Posts: 1,712
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Quote:
Originally Posted by tom chelbana
With both Spartan and FL chassis experiencing derating and stop engine problems becoming either a tow or brake down this is what the trucking industry has come with. To assist diesel engine owners with an option when their coach gets a check engine light along with DEF codes there is a option that owners can do to allow them to either to continue driving or avoid a tow. This is option that I know some owners would like to know about and use. This procedure has been posted on irv2 Entegra forum and today I went under our 2018 London Aire on a Spartan K-3 chassis with the Cummins 605 to check the location of the speedometer disconnect, which is on all Cummins engines and shot two photos to show where this connection is located. It is located on the transmission on the DS (right) side. By disconnecting this speedometer sensor this will allow you to operate your coach to drive to location to repair DEF head or until the time the DEF heads are available with out being derated or shut down. With the speedometer sensor disconnected your coach will not have a speedometer. Some owners will not be interested in this emergency/temporary procedure, but I would, if the DEF head problem caused me to be broken down along the highway.
Newmar Man
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Thanks Tom, that's good to know for sure
DS drivers side should be the left side, passenger would be right side. So the DS is the drivers side correct?
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Ted & Nancy
2015 Newmar Dutch Star 4018
2020 Jeep Wrangler Rubicon
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06-10-2021, 08:00 PM
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#3
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Registered User
Newmar Owners Club Ford Super Duty Owner Freightliner Owners Club Retired Fire Service RVer's
Join Date: Jan 2019
Location: Rosemary Farm, Northern Ca
Posts: 5,444
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I’ve read about this elsewhere, and apparently it’s common knowledge among truckers. I Definitely would try this over experiencing another derate. I can live without a speedometer anyway, but anyone with a GPS that displays their road speed can use that instead. Mine does so having the in dash speedo off would be a non-issue to me.
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06-10-2021, 08:11 PM
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#4
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Senior Member
Newmar Owners Club Winnebago Owners Club Spartan Chassis RV Trip Wizard
Join Date: Mar 2006
Location: Tyler, Texas
Posts: 567
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Awesome information for sure! Thanks
(Oh, and I'm betting Tom is using Newmar terminology... DS is for Door Side.)
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Millard & Sherry
2019 Mountain Aire 4018
Toad 2014 Honda CRV or 2019 GMC Canyon
M&G Braking-Roadmaster Towbar
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06-10-2021, 08:24 PM
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#5
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Senior Member
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 4,465
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Question.
Will this disconnecting of the sensor work only before a derate happens, or will it “cure” a derated situation? I suspect it must be done as soon as a code is registered.
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Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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06-10-2021, 08:32 PM
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#6
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Registered User
Newmar Owners Club Ford Super Duty Owner Freightliner Owners Club Retired Fire Service RVer's
Join Date: Jan 2019
Location: Rosemary Farm, Northern Ca
Posts: 5,444
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Quote:
Originally Posted by Ljwt330
Question.
Will this disconnecting of the sensor work only before a derate happens, or will it “cure” a derated situation? I suspect it must be done as soon as a code is registered.
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I think you’re right. So if you’re already at 25% derate, it wouldn’t reverse that, but would keep it from derating further.
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06-10-2021, 08:37 PM
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#7
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 23,914
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Here is a file I posted before with derate info....
Cummins DEF-Related Warnings.pdf
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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06-10-2021, 09:43 PM
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#8
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Senior Member
Join Date: Sep 2010
Posts: 4,505
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As this information gets out we should start hearing about questions like if the engine has already starting derating, if full performance will return. For us, we would pull the plug on the speedometer as soon as it was indicating the DEF codes and the check engine light is on. Won't wait to be at the point were derating and stop engine are already on. Would request if anyone using this speedometer disconnect to operate their coach because of DEF/check engine to share with the Newmar irv2 owners.
Newmar Man
__________________
Tom/Teri 16031 NKK 117995 FMCA
18 London Aire 4531 Spartan K-3 605
97-04 LA 04-18 Essex 2018 London Aire
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06-10-2021, 09:46 PM
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#9
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Senior Member
Join Date: Sep 2010
Posts: 4,505
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Sorry for using DS which I used for Driver Side our left side.
Newmar Man
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Tom/Teri 16031 NKK 117995 FMCA
18 London Aire 4531 Spartan K-3 605
97-04 LA 04-18 Essex 2018 London Aire
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06-11-2021, 03:59 AM
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#10
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Senior Member
Join Date: Sep 2007
Location: PA & FL
Posts: 1,406
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When I posted this in the Entegra forum, I had found it searching for a way to continue if the know codes were thrown. It seemed like it could be worth a try for those of you with newer vehicles who are having def head issues. Evidently it is something some of the truckers with Cummins engines are trying. I hope it works.
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06-11-2021, 05:31 AM
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#11
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Senior Member
Tiffin Owners Club
Join Date: May 2018
Location: florida
Posts: 174
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This news is great.
This option provides a possible way to proceed on your travel to a repair shop (Cummins Shop or other) without the nagging fear that your coach will suddenly derate or stop on a busy interstate highway. We suffered the dreaded DEF fault codes in our 2018 Allegro Bus 40AP. Tiffin overnighted us the replacement unit and I was able to change it myself. Even though we now have a 2021 45`OPP, I still scan for fault codes constantly. Thoughts of being stuck on a interstate narrow shoulder with 85 mph traffic is worrisome. Thanks very much for sharing this info. This may be the best information post that we have ever received from IRV2. Stay Safe.
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06-11-2021, 06:52 AM
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#12
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Senior Member
Join Date: Nov 2018
Posts: 457
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That's great information Tom, thanks for sharing.
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Scott R
2019 London Aire 4543 SL605 FCCC
2023 Jeep Grand Cherokee Summit
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06-11-2021, 08:53 AM
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#13
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Senior Member
Join Date: May 2009
Posts: 1,399
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Has anyone actually driven with the speed sensor disconnected? Usually the speed sensor feeds info to many things other than the speedometer. This is how the transmission knows when to shift among many other things going on. Maybe they are using more than one speed sensor?
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Kert and Angela
2018 provost marathon h3-45
2018 Ford F350
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06-11-2021, 01:44 PM
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#14
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Senior Member
Spartan Chassis
Join Date: Mar 2017
Posts: 1,498
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Thanks Tom! Someone raised the concern of the transmission being controlled by the speed sensor. Am I wrong in my thinking that the transmission shift-point is controlled by the RPMs not the speed? It's been too many years since I did engine/transmission work.
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