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when a throttle body is changed - it will have to be flashed for the PCM to "learn" the new one.

That's been a characteristic of the '15+

You'll either have to put the original one back on, bring to a shop to install new one again and to the procedure.

Or - have it towed to a shop (or dealer) that has appropriate system that can do that step
 

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2018 Hellcat. 2017 Scatpack.
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Hal is spot on.
Question is, why the swap on a brand new car? issues prior that required this?
 

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Super Moderator
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Hal is spot on.
Question is, why the swap on a brand new car? issues prior that required this?
often owners believe a larger diameter TB will make more power. If the TB diameter is larger than the inlet on the intake, how would that make any difference?

As Luke at Steve White Motors has posted in the past, a throttle re-learn is required when the stock TB has been changed out, otherwise it won't work.

there's this ongoing belief that cat-back setups and larger TB will make more power on their own - with a stock engine.

this isn't like the old days of going from a 2-bbl carb and single exhaust to a 4-bbl and dual exhaust and gain power just by those changes.

Even the old 2-bbl versions had smaller valves, milder cams and lower CR over the hi-po 4-bbl versions.
 
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