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06-23-2022, 04:43 PM
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#1
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Senior Member
Join Date: May 2010
Location: Tucson
Posts: 442
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Check engine icon
Check engine icon is lit, but no alarms or check engine on the LCD display. I have a 450 Cummins. Drove 800 miles with it on with no problems. Has anybody else had this happen. Thanks
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2018 DUTCHSTAR 4002, 2014 JEEP UNLIMITED RUBICON, 3 CAIRN TERRIERS, MODEL RAILROADER 
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06-23-2022, 06:35 PM
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#2
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Senior Member
Join Date: Nov 2011
Location: Full time RV'er
Posts: 5,008
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Did you check all the fluids? How about the serpentine belt, that still in good shape? Spinning everything? Or the water pump belt if you have one?
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06-23-2022, 06:36 PM
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#3
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Senior Member
Winnebago Owners Club Ford Super Duty Owner
Join Date: Jul 2012
Location: Where the Rig is Parked
Posts: 1,389
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Could be anything. Need to put a scan tool on it to see what it is. When mine came on it was the breather filter that was getting plugged getting higher than normal crankcase vent pressure.
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06-23-2022, 06:40 PM
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#4
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Registered User
Join Date: Jul 2008
Location: Pennsylvania
Posts: 2,724
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I have a 2020 with a 450 ISL
I can scroll on my dash to diagnostics
Then scroll to faults
It show the faults on the screen.
These faults were the beginning of a bad day
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06-24-2022, 11:02 AM
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#5
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Senior Member
Join Date: Oct 2011
Posts: 1,026
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Check your fuel caps and make sure they are both tight.
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07-02-2022, 05:17 AM
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#6
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Senior Member
Join Date: Oct 2011
Posts: 1,026
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TUCSONRAIL,
Do you have any update on the problem you were experiencing?
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07-03-2022, 01:33 PM
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#7
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Senior Member
Join Date: May 2010
Location: Tucson
Posts: 442
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No I have no update. I will probably take it to Frieghtliner to get it cleared.
__________________
2018 DUTCHSTAR 4002, 2014 JEEP UNLIMITED RUBICON, 3 CAIRN TERRIERS, MODEL RAILROADER
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08-02-2022, 06:23 PM
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#8
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Senior Member
Join Date: May 2010
Location: Tucson
Posts: 442
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Freightliner replaced a line to the def heater at no cost to me. It caused no derate or other problems, just a lit engine icon. I guess there must be a heater element for freezing weather.
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2018 DUTCHSTAR 4002, 2014 JEEP UNLIMITED RUBICON, 3 CAIRN TERRIERS, MODEL RAILROADER
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08-03-2022, 03:46 PM
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#9
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Senior Member
Join Date: Jul 2009
Posts: 1,919
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Quote:
Originally Posted by TUCSONRAIL
Freightliner replaced a line to the def heater at no cost to me. It caused no derate or other problems, just a lit engine icon. I guess there must be a heater element for freezing weather.
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There is no DEF heater "element". DEF is heated by engine coolant.
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ernieh
2019 Phaeton 37BH
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08-04-2022, 01:34 PM
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#10
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: Mar 2011
Posts: 6,672
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CEL can be virtually nothing or very serious. It may cause no problems or could change to a Stop Eng Lt.
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2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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08-04-2022, 02:27 PM
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#11
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Senior Member
Join Date: May 2010
Location: Tucson
Posts: 442
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All I can tell you is they replaced def line (wire) heater circuit 3 which had a short. which was throwing codes 3238, 3241, and 3423. What can I say?
__________________
2018 DUTCHSTAR 4002, 2014 JEEP UNLIMITED RUBICON, 3 CAIRN TERRIERS, MODEL RAILROADER
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08-04-2022, 10:17 PM
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#12
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Senior Member
Newmar Owners Club Entegra Owners Club
Join Date: Dec 2015
Posts: 1,556
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ernieh & TUCSONRAIL, the DEF TANK is heated by routing hot engine coolant through a stainless steel heating loop that is built into the DEF sensor, BUT the LINES that transport the DEF fluid from the tank to the DEF doser pump and injector and back to the tank are heated with 12V heating coils built into the hoses (like a garden hose with a “heat tape” wrapped around it).
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2021 Entegra Aspire 44W
Previous: 2006 Newmar Essex 4508
2013 Tiffin Allegro Open Road
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08-23-2022, 09:38 PM
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#13
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Senior Member
Tiffin Owners Club
Join Date: Jan 2020
Posts: 357
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Quote:
Originally Posted by Archer2
ernieh & TUCSONRAIL, the DEF TANK is heated by routing hot engine coolant through a stainless steel heating loop that is built into the DEF sensor, BUT the LINES that transport the DEF fluid from the tank to the DEF doser pump and injector and back to the tank are heated with 12V heating coils built into the hoses (like a garden hose with a “heat tape” wrapped around it).
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Great info. Thanks!
__________________
John and Jana Z
2020 Allegro Red 37BA
First Motorhome 
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