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Old 08-17-2010, 08:30 AM   #1
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obd 2 port

I have a 2003 winnebago journey dl class a 32 ft motorhome with the 5.9 300 hp cummins and my check engine light is and so i have a obd 2 port reader to check the code but cannot find the port so any help with that port is at would be greatly appreciated and i have looked under the dash where they are usually at

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Old 08-17-2010, 10:22 AM   #2
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Our coach is a little older and may be different from yours. Our diagnostic plug is under the dash just to the left of the steering column. There's a carpet covered vertical panel (footrest?) that must be removed to get to the plug. That area also houses the prewire for the CB. Our panel is held in place by screws through a bracket into the floor in 2 different places.

Hope this helps.

Denny, Connie & Shadow (former barn cat made good)
2006 Tiffin Phaeton, Cat C7, Freightliner Chassis
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Old 08-17-2010, 11:03 AM   #3
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I believe that the port you are looking for is above the radiator. My MH has a Cat, but the plug is not a normal automotive OBDII port. It's round with a grey cover.
2012 Phaeton 36QSH
2007 Wrangler Toad
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Old 08-17-2010, 11:39 AM   #4
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Workhorse Chassis Owner
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I thought they used a CAN bus instead of a OBD bus on diesel motor homes.
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
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Old 08-19-2010, 01:08 PM   #5
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Yep, OBD-II doesn't work on heavy duty diesels. Your coach uses the J1939 protocol, which is pretty much standard in heavy duty applications. Your OBD-II scanner won't work on it. The least expensive option to get J-1939 codes would be to get Silverleaf's VMS-PC software and adaptor cable. You can use your laptop to monitor your system as well as many other features. RVupgrades handles Silverleaf products.
Mark & Leann Quasius
2016 Cornerstone 45A
2007 Allegro Bus 42QRP (Sold)
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check engine light, obd 2 port

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