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2019 Classic Laramie CC
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Got my first check engine light, now I feel like a real ecodiesel owner. P20EE code. Just turned 4000 miles. 2019 Classic. At least I have the GDE tune and tool so I could read the code. Went over the truck looking for loose connections...the three bolt exhaust flange that the bolts break next to the def injector were kinda loose...not really loose but not very tight either. Snugged them up but found nothing else so cleared the code and we'll see how long or if it comes back. If it does, I guess a trip to the dealer will be the next step. Glad I still have my Silverado. And yes, I use Hotshot EDT. It's at half a tank of fuel and I don't think fuel quality caused it. Runs great. We'll see.
 

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Maybe check the DEF injector for crystallization??
 
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