06 engine in 05 truck - Diesel Bombers



5.9 Liter CR Dodge Cummins 03-07 Discussion of 5.9 Liter Dodge Cummins Diesels with Common Rail Injection

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  #1  
Old 05-09-2017, 08:11 AM
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Default 06 engine in 05 truck

I have installed an 06 engine in my 05 3500 dodge dually and my fuel mileage has dropped to appx 10 mpg when towing. Before I could get 18 loaded. Do I have to get the computer reprogrammed? What else could be going on?
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Old 05-09-2017, 10:31 AM
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Any CEL lights or soft codes? Hand calculated mpg?
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Old 05-09-2017, 10:55 AM
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Default No lights

Yes computer says 11.7 but by hand it's closer to 10. No lights are on
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Old 05-09-2017, 11:27 AM
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Default No lights

Yes computer says 11.7 but by hand it's closer to 10. No lights are on
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Old 05-09-2017, 07:31 PM
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Are you using the 06 or 05 ECU?
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Old 05-09-2017, 08:16 PM
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Default 05

The 05 computer
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Old 05-09-2017, 09:17 PM
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That might be your issue right there.
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Old 05-09-2017, 09:33 PM
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Quote:
Originally Posted by 11B/11C View Post
That might be your issue right there.
might be or is does anyone know for sure?
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Old 05-09-2017, 10:07 PM
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Quote:
Originally Posted by Billyjoeo View Post
might be or is does anyone know for sure?
That's your issue, found answer below in a cumminsforum thread...in a nutshell

The 2005 ecm runs the truck using the SCI interface, while 2006 up uses a MUCH more complicated CAN bus system.

carcomputersystem posted on here on 4.18- send them a PM and get an 06 computer. The best thing is you can get EFI tuning with your 06 ecm so you can increase your mileage over your stock 05 #s!
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Old 05-09-2017, 11:05 PM
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I was pretty sure it was your issue, but wasn't positive. Likes like he found your answer.
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