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Yea I see sub 5k OE take off's going for like 1200$ on Craigslist all of the time

Not to spoil anyone's fun here. I did mine for $10 with supplies to spare for another whole truck

@Green Diesel could you guys shed some light?

From everything that I understand when gde does an off road tune they set the def gauge to read half regardless of fluid level. So it's not actually reading the tank level it's just programmed as a constant.

Holy shit it worked!!! Nice job! So your mileage counter is gone? I think p20 is just a generic code, nothing specific that causes trouble. My truck stores generic codes like that all of the time but never amount to anything. Not even a CEL. Congratulations on the fix for now!

My state doesn't regulate, but I haven't had any issues with scr/dpf/def systems. When I do, and that isn't rectified by a tank flush, all that shit is going to be gone. Just too many $$$ for repairs

Does your state require annual smog and emissions testing? Basically gde or ppei to flash your engine computer and then remove all of the emissions equipment in the exhaust and replace with straight exhaust pipe. Basically some time down the road you'll likely have problems with the...

The code won't clear unless it's physically gone or reset by the dealer. Disconnecting the battery will only clear soft codes. And they'll still be stored

Don't know what state you're in and what emissions regulations you have.. if they don't fix it under some extended Warranty are you going to bite the 2k repair or thinking to tune it?

Nah it's a hard code in the dealer end of the computer.

Wish you luck!

At this point it's just going to stay on the mileage countdown I think

Really not sure on the factory tune..

Also it takes a while for the def gauge to register change, up to like 10 Minutes? So if you put your key in the on position and just it sit for a while to give it enough time to register. Just a quick key cycle may not register the present level.

Is your def needle on E? You should be able to put cycle the ignition and see if it's registering a fluid level change by now even? Don't even need to start it. Also owners manual states to only fill def to 2/3 or something like that because of expansion when freezing in climates that see sub...

Just Make sure and flush that out good before refilling. (Hence my opinion on just using the hose to let it overflow and flush out [I know winter isn't the ideal time to do this])

I would Probably dump 1 gal of regular distilled white vinegar and the rest water for maybe 4 hours?

Yea I'd assume any clean water would be enough to dilute it and dissolve the deposits, unless you end up needing some acidity

Are you trying vinegar solution or just the water out of curiosity?

Sweet. Are you actually going to drop the tank or flush it in place? That's what I would do. Just do a vinegar water fill for 3 hours, drain, flush, and then dump a few gallons of def in. Just my opinion if I were in your shoes. Not sure if it's what you were asking but yes it's a 8 gallon tank...