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Discussion Starter · #1 ·
The other day the jeep had an engine code/light come on. I have the life time warranty so I took it in. This is what they put as far as the code is. Any Idea on what this is? He said that he had to update some time in the system and also something with the Ac/Heater as well.

3904 stored TCM no comm DTC set 0.20
This is what on my order.

I have 39000 on the Jeep
I had them change the trans fluid first one time I changed it was at 18000 and now at 39000.

Just curious if anyone might know what they did to it thanks
 
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