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Old 12-25-2010, 10:16 AM   #1 (permalink)
bigman55434
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Exhaust Fluid Quality Poor warning at 2075 miles

Well, I suppose with my luck, it had to happen on Christmas eve while I was traveling out of town. No dealer available until at least Monday, and I have over 400 miles to go since the warning (125 traveled so far). As far as I can tell, I should be able to make it home before I go in 4mph mode. I plan to fill up with fuel before I head back home, which is 275 more miles. Onstar told me to add a gallon of def. I would rather not, so the dealer gets it back with the same def as they gave me when I bought the truck. I thought I read somewhere that a Nox sensor might be the culprit.
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Old 12-25-2010, 07:34 PM   #2 (permalink)
ytmorris
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I would add a gallon. I keep some in my tool box just in case and I am pretty sure the dealer can hook it up to the computer and see what the problem was.
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Old 12-25-2010, 07:47 PM   #3 (permalink)
bigman55434
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The bigger challenge right now is finding a gallon. The truck stop I know has it is 120 miles away. I know I will be past the 200 mile threshold, which shutting the truck off to buy and fill the def will likely put me in 55 mph mode. I think I will wait until I get back to Minneapolis to mess with it.
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Old 12-25-2010, 08:00 PM   #4 (permalink)
LanduytG
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I would be willing to bet it won't matter if you fill it or not. Sounds to me like the level indicator has lost its cal. I went through the same thing last Tues when I was 500 miles from home. But I was lucking and got it to a good dealer only 20 miles away. The took off the tank and drained it. Reprogrammed it with a new cal from GM and was good to go. Although having to wait till Monday would suck.



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Old 12-25-2010, 08:36 PM   #5 (permalink)
bigman55434
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I got the warning after 150 miles of interstate driving. Temp was 28 according to the DIC. the warning happened after I stopped for a half hour, and then restarted the truck. Wonder why it would lose the calibration at that time. I do have the winter front on it. Could that have anything to do with it, like messing with the temp sensor, affecting the def heater? It was below 32f out per weatherbug.
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Old 12-27-2010, 10:55 AM   #6 (permalink)
bigman55434
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Well, the problem resolved itself 150 miles after the DEF warning light and DIC message first appeared. There were two ignition cycles between the time the message appeared, and when it cleared. The outside temp per the DIC was 28F when the warning appeared, and it was 20F when the message cleared. Onstar says the two codes stored are gone. One was something like "NOx reduction circuit (or system) underperform". I don't recall what the other code translated to, but it was similar. I did not add any DEF to clear the message.

I spoke to the service manager, and this exact issue is fairly common with trucks used for plowing. I guess the computer is getting confused into thinking the DEF tank is frozen when it is not, or vice versa. GM issued a temporary reflash to bandaid the problem for the plow drivers, which prevents the truck from going into limp mode (it does not prevent the warning light). They are working on a permanent solution. The service manager also said that GM told them to take any affected trucks out on the road for at least 20 miles of uninterrupted highway driving. This helps clear the condition as well (as it did for me). Also, the service manager did not think the winter grill cover was a factor, especially for highway driving.
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Old 12-28-2010, 05:37 PM   #7 (permalink)
Crawford
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I got the def poor quality message yesterday and the last few days my trips have been relatively short at 10-15 miles. The truck also spends its nights in a heated garage, but I don't think that has anything to do with it. Only 1900 miles with original def in its tank.
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Old 12-28-2010, 09:49 PM   #8 (permalink)
Blitzdiesel
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I got the EFQP message today after driving 80 miles(temps in the mid 20s). Truck is a week old with 400 mlies on it. I took it to the dealer where I got it and after an hour wait the tech came out and said he put 2 gallons of DEF in it and did a regen. He couldn't get the EFQP message to go away. He told me to drive it and hopefully the EFQP message will reset. He said if it doesn't go away soon bring it back and he will need it for a day, so he can drop and drain the DEF tank. I dove it about 50 miles tonight, still on. I don't think he should of been able to put 2 gallons of DEF in a new truck with 400 miles on it. I have to do a 400 mile trip tomorrow, so if the EFQP doesn't go off I will put the 55 mph mode to a test. Sucks to have problems with a new truck!
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Old 12-29-2010, 10:10 AM   #9 (permalink)
bigman55434
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Quote:
Originally Posted by Blitzdiesel View Post
I got the EFQP message today after driving 80 miles(temps in the mid 20s). Truck is a week old with 400 mlies on it. I took it to the dealer where I got it and after an hour wait the tech came out and said he put 2 gallons of DEF in it and did a regen. He couldn't get the EFQP message to go away. He told me to drive it and hopefully the EFQP message will reset. He said if it doesn't go away soon bring it back and he will need it for a day, so he can drop and drain the DEF tank. I dove it about 50 miles tonight, still on. I don't think he should of been able to put 2 gallons of DEF in a new truck with 400 miles on it. I have to do a 400 mile trip tomorrow, so if the EFQP doesn't go off I will put the 55 mph mode to a test. Sucks to have problems with a new truck!
The tech should not have been able to add 2 gallons of DEF to your truck if they filled the tank properly as part of the PDI (Pre-Delivery Inspection). GM pays the dealers to put another 3 gallons of DEF into the tank, in addition to the 2 gallons it ships with. Your dealer just pocketed the money, like many do. As for limp modes, you have 200 miles from the time the code was first set, to operate the vehicle normally (no limp mode). After 200 miles, you will get the "55 mph upon next restart". After another 300 miles, you will get the warning "max 4mph upon next fuel fill". Bottom line is keep that fuel tank full, especially as you approach the 500 mile mark since the light came on. Otherwise, you will be screwed on your trip.
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Old 12-29-2010, 09:38 PM   #10 (permalink)
Blitzdiesel
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Quote:
Originally Posted by bigman55434 View Post
The tech should not have been able to add 2 gallons of DEF to your truck if they filled the tank properly as part of the PDI (Pre-Delivery Inspection). GM pays the dealers to put another 3 gallons of DEF into the tank, in addition to the 2 gallons it ships with. Your dealer just pocketed the money, like many do. As for limp modes, you have 200 miles from the time the code was first set, to operate the vehicle normally (no limp mode). After 200 miles, you will get the "55 mph upon next restart". After another 300 miles, you will get the warning "max 4mph upon next fuel fill". Bottom line is keep that fuel tank full, especially as you approach the 500 mile mark since the light came on. Otherwise, you will be screwed on your trip.
The 2 gallons added must of brought the DEF quality up enough. 10 mins into my trip the EFQP message disappeared About 60 miles after the DEF was added and 1 regen done by the tech.
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