My ez-lynk’s batteries died while I was downloading a tune for my pickup. Am I doomed?
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To the best of my knowledge, nothing changed if it doesn’t truly give you the tune successful message.
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Get new batteries and try again, it is not worth charging if they died in the 5 minutes it takes to finish the process.
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The truck restarted. I still have power when driving, but the music isn’t the same as it was before, 
I am heading to my friend to check on it.
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Ezlynk tells us what you are running. If it does not it’s on the original tune u had.
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Maybe. While I have not used an EZ Link, using the Ford scan tool IDS for your vehicle can allow you to save the module from a previous session. There are several warnings before programming begins to connect a battery charger. This is actually the first step at the dealership because there’s no guarantee that the PCM can be preserved.
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Low battery voltage is the code I keep seeing. I am going to check if anything is wrong by charging the battery and calling my tuning firm.