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Urea tank - DEF SCR problems with GM

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Old 03-10-2011, 07:21 PM
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Urea tank - DEF SCR problems with GM

Found this on the D/A forums. GM apparently has a few problems and while awaiting a recall to be devised, the SCR is being turned off at the dealers.

GM RECALL (soon) - Chevy and GMC Duramax Diesel Forum
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Old 03-10-2011, 08:48 PM
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Yea GM is having ALOT of problems with there systems!
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Old 03-11-2011, 12:51 AM
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my buddy that bought a 11 dmax has been back to the dealer 3 times for DEF issues. the dealer even offered to buy the truck back from him! he said no tho
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Old 03-11-2011, 07:40 AM
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Does any of this have to do with the tank being on the outside of the frame or just system failures?
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Old 03-11-2011, 07:44 AM
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man... what kind of havoc is this going to cause at emissions testing locations... I guess GMers will just have to get inspected at dealers until they figure this out
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Old 03-11-2011, 08:13 AM
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I wonder why GM took the route of limp mode vs. our Fords keep running; the side effect seems to be more fuel burnt on the Fords.
You would think the EPA would require similar requirements for all DEF vehicles.
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Old 03-11-2011, 10:15 AM
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Here is a link to a virtual "War and Peace" on the GM problem.

DEF problem - Diesel Place : Chevrolet and GMC Diesel Truck Forums

51 pages and counting...
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Old 03-11-2011, 10:24 AM
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Here is a link to a virtual "War and Peace" on the GM problem.

DEF problem - Diesel Place : Chevrolet and GMC Diesel Truck Forums

51 pages and counting...
Eeek.... factor this into the cost of DEF. Just reading through the thread is about $400 worth of my time! That will buy a lot of DEF!

Oh, and the time I spend on FTE is, of course, worth it.
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Old 03-11-2011, 10:38 AM
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just sad....
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Old 03-11-2011, 12:02 PM
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Can the need for DEF be eliminated that easily on our Fords and has anyone successfully done it?
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Old 03-11-2011, 12:17 PM
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Can the need for DEF be eliminated that easily on our Fords and has anyone successfully done it?
Do you like your warranty?
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Old 03-11-2011, 12:38 PM
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the worst vehicles I have ever seen have been GM products, funny those labels they put on have looked exactly the same since the '70's. if you have a long lasting reliable GM product I would say you got lucky. but people still seem to keep on buying.

I still remember the lumina's, berettas, astros, and those slant nose vans of the mid to early 90's ***** would come off in your hand, the door handle may break off, the dash would be bulging and the head liner sagging down on your head. ford has made some terds too, windstars and taurus come to mind and the 6.0, had a neighbor with an '06 6.0 had tons of problems sold it and bought an '11 dodge, too bad he didn't stick with ford I think a new one would have made him happy.
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Old 03-11-2011, 12:44 PM
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Do you like your warranty?
dunno haven't used or needed it but seriously I was just wondering if our setup was as simple as just pulling a fuse or reflashing and voila like it was never there like on the GM vehicles.
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Old 03-11-2011, 02:37 PM
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dunno haven't used or needed it but seriously I was just wondering if our setup was as simple as just pulling a fuse or reflashing and voila like it was never there like on the GM vehicles.
It appears to me the temporary GM fix is considerably more involved than pulling a fuse. It looks like a completely new ECM program to allow the bypassing of the DEF injection system without triggering CEL's and limp mode operation. I would think you would need to backwards engineer the computer coding to duplicate the results. GM and Ford have the source code so it is easier for them. JMO

Look at Trucklands thread. He just found out his warranty was worth at least $2000.

Regards
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Old 03-11-2011, 03:26 PM
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A couple of thoughts, I'm really glad the friend did not give his Dmax back in the previous post. No 2011 Dmax and we would not have free 400/800. I do find it ironic at how easy (and quietly) GM was able to get an open ended exemption out of EPA and CARB. I seem to remember a bunch of folks (not here) bagging on Dodge about having an exemption since they weren't using DEF this year when in fact they just have a different strategy for treatment.

Other than having to fill it DEF is our best friend, it knocks down NOX emissions with out any performance affect in fact the opposite is true. A large portion of the fuel economy gains of our engines over the 6.4 is the reduction of EGR required due to the DEF doing the same job. If I had a choice I would have a 20 gallon DEF tank and no EGR system in a heartbeat. If for no other reason than the contamination of the oil it causes.
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