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Old 12-02-2010, 04:24 PM   #1 (permalink)
gfd_703
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DEF quality poor

Driving along today and got a mesage that said DEF quality poor / see operators manual now. Looked it up and it said 200 miles truck goes to 55 mph and at 500 miles it goes to limp home.

Called my dealer and they said bring it in.

2600 miles DEF filled by dealer 1100 miles ago. Outside temp in mid 40's.

Before I got to the dealer the light went out and mesage went away. It stayed on for around 70 miles and the truck was started 2 times during this time.
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Old 12-02-2010, 05:06 PM   #2 (permalink)
Max Power
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Where do you buy your DEF? If you buy anything other then GM DEF I bet they will drain the tank, but GM DEF in and hand you a bill.
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Old 12-02-2010, 05:15 PM   #3 (permalink)
gfd_703
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DEF is what came in it plus what they topped it off with at the first service. They did not do anything just told me to drive it and see if it happens again.
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Old 12-02-2010, 05:37 PM   #4 (permalink)
Huntindog
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Quote:
Originally Posted by Max Power View Post
Where do you buy your DEF? If you buy anything other then GM DEF I bet they will drain the tank, but GM DEF in and hand you a bill.
He said the dealer filled it for him.
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Old 12-02-2010, 05:41 PM   #5 (permalink)
chevyduramax
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DONT TOP IT OFF.
Do not over fill the DEF tank. When fluid reaches the top of the fill pipe, stop filling. Do not top off the DEF tank.
Read your owners manual it has it there.
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Old 12-02-2010, 05:56 PM   #6 (permalink)
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What does filling the tank have to do with Def quality?

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Originally Posted by chevyduramax View Post
DONT TOP IT OFF.
Do not over fill the DEF tank. When fluid reaches the top of the fill pipe, stop filling. Do not top off the DEF tank.
Read your owners manual it has it there.
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Old 12-02-2010, 06:50 PM   #7 (permalink)
T2CH
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Filling the def tank
Where do you live?, cold climate? could have been partially frozen.?
Maybe had some trash in it?
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Old 12-02-2010, 07:19 PM   #8 (permalink)
UKNOWME8
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once again read he said he has not added any DEF only the dealer has added DEF but it sounds like maybe some froze or something i get my def from o'rielys and i buy peak blue-def and i have never had a problem with the light coming on and its only like $4 for 1.5gal
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Old 12-03-2010, 11:21 AM   #9 (permalink)
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I had the same message come up at about 2500 miles. I called my dealer and he said it was probably due to the temperature change and condensation building up in the lines where the sensor is. I had not added any DEF since I had purchased the pickup, so he said to add a 2.5 gal jug to be safe and see what it does. I added the DEF and the message stayed up for the next two times I started the pickup that day, but went away after that. I've never had any trouble with it since, and I'm at 6,000 miles.
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Old 12-03-2010, 03:31 PM   #10 (permalink)
gfd_703
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All is good for now. It has not come back on.

Problem is what happens on a long trip. Mine went off in about 80 miles, UKNOWME8 had his go off after the next 2 key starts.

200 miles is not long enough to get back home and carry it to the dealer. It will leave us stranded on the side of the road.

Thank You EPA for this BS
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