So, I bought an MM3 tuner for my 2020 RAM 3500 HO DRW, and when I tried to download the tune, I failed to write ECM.
The batteries are good, and the unlock cable is connected.
I don't know why it's not writing.
It has downloaded as much as 43%; then I get the reading that says failed.
Did I get a faulty tuner that won't work, or is it something with my truck?
The truck also keeps showing up on the radio with the message "Enter your anti-theft code."
I enter it, and it goes away, so I'm unsure if that has any relevance.
If I go with another company's tuner, can I plug that in and try tuning it, or is my ecm now messed up because it has attempted to download the files multiple times?
If anyone has had this problem, please help get me in the right direction.
Thank you.
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