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I've been considering purchasing a 2014-2016 Grand Cherokee ecodiesel. I'm just starting to educate myself on all this complicated history. I've got a couple questions that I haven't seen directly addressed (although maybe I just didn't know how to ask).

It's entirely possible that they've never been asked because they're just that stupid. Feel free to crucify me for it, no need to go easy on me just because I'm an idiot.

1) Is it possible at all to basically undo the AEM update? I've seen plenty of talk about different tunes and saw a post that one owner was able to actually do the V08 and VA7 updates themselves. Is there anyway to basically roll that back?

b) Is my first question basically what people are trying to accomplish with the tunes, just not necessarily in such a direct way?

Please feel free to educate me, as it's the only way out of my ignorance. I like the diesel as a nice spot between capability (towing capacity, etc) and fuel economy, but it seems like with all the changes there's maybe not really enough differentiation to deal with the potential problems.
 

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Welcome to the forum... I always say, "the only stupid question is the one you don't ask". Lots of info here, you just have to know what to search for to get your answer.

To answer your first Q, about the only way to "reverse" the AEM tune would be to find an old ECM or find an old GDE tuned ECM. Finding an older GDE ECM for a JGC is nearly impossible. Either of these 2 options would require some work on your own to reprogram the VIN & injector codes. This can be done with AlfaOBD software.

The newer GDE tune is EPA compliant meaning it has gone thru testing to meet EPA protocol.

I have a little over 100k miles on mine. I only have 2 complaints... EPA tuning & tone ring (reluctor wheel) failures. I have the SFT tune ordered & currently no solution for the tone ring failure that I'm aware of.
 
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