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Old 06-03-2019, 08:31 AM   #1
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2005 e350 superduty 6.0 diesel - missing OBD2

Hi All,

I was hauling the camper this weekend when the van threw a check engine light.

I stopped by an advanced auto to use their OBD2 scanner... and I can't find the receptacle under the dash! it's not where it should be and I tore the dash apart and can't find it hidden up there or even cut off wires where it used to be.

Any ideas on where I might find it?

The history on this van was that it was aftermarket up-fitted as a communications van for an oil field.

Is there a good way to trace from the PCM to where the OBD should be?

An alternative location it might be located to "hide it" from workers that they didn't want them to mess with it?

BrianW pointed out this thread to me about a GPS tracker that hooks into the OBD2 and is then hidden under the dash...

https://www.f150forum.com/f118/obd-p...issing-421680/

Any help is greatly appreciated.
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Old 06-03-2019, 12:53 PM   #2
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It probably didn't go far. There's not a lot of slack in the wire bundle. I'd suspect its behind the knee panel, between it and the structural metal knee panel which also supports the steering column. Normally it just pops off (pull straight back towards the driver seat) but your brake controller bracket might be holding it on too.
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Old 06-03-2019, 01:34 PM   #3
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Use a handheld mirror and a good source of light to look under there.


But damn, that's a whole lot of surface rust on all that metal.




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Old 06-03-2019, 01:40 PM   #4
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yup, but it's only surface rust. My theory is they ran a/c inside the van and created condensation when it was sitting on job sites.

A few screws missing under there too.....
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Old 06-04-2019, 09:51 AM   #5
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Hi All,

Well, I found it... wasn't as complicated as I was thinking.. it was just tucked really well out of site, closer to my face than I could see apparently. Searching again in daylight got ride of the shadow that was hiding it when I was using a flashlight.

I scanned the codes and got some very different codes. Again, I was hauling the camper when it threw these, so i'm tempted to reset the codes and see if it throws them again under normal driving conditions.

P0478
Exhaust Pressure Control Valve "A" High
https://www.obd-codes.com/p0478

P0299
Abnormal boost
https://www.obd-codes.com/p0299

P0404
Egr valve out of spec

https://www.obd-codes.com/p0404

FYI the camper is 6k lbs loaded... not anything super heavy, but I really thought the 6.0 would do better hauling it than it does...
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Old 06-04-2019, 10:16 AM   #6
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Those codes all point to sticking turbo vanes, and this can also reduce peak boost. All the surface rust inside points to that van being stored in a humid environment, and the turbo probably has similar rust inside, which will cause the stiction.

That said... With 225 horsepower, it won't pull your trailer up hills as fast as a V10....
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