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First dealer visit. What is a PCM update?

Wbino

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Went in for my 5k multi point inspection.
Mentioned something about a PCM update and whether I wanted it done today or next visit.
I waited was out of there in an hour and a half.
So a inspect and reprogram module 181906FK.
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JasonInDLH

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Went in for my 5k multi point inspection.
Mentioned something about a PCM update and whether I wanted it done today or next visit.
I waited was out of there in an hour and a half.
So a inspect and reprogram module 181906FK.
Curious, what did the update do?
 
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Wbino

Wbino

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Curious, what did the update do?
Inspect and reprogram PCM PERFORM OPEN RTT 21-139

whatever that is. 2021 JLU took delivery in April.
I brought it in for my first oil change.
 

YippieKiYayMrFalcon

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PCM is a powertrain control module. It’s the computer for your engine and transmission, among other things. There was probably a software update available for it.
 

JasonInDLH

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PCM is a powertrain control module. It’s the computer for your engine and transmission, among other things. There was probably a software update available for it.
I know what the PCM is and what it does, but was just wondering the specifics of the update. As @Wbino stated: “PCM PERFORM OPEN RTT 21-139”

My guess is that it is something associated with the open loop tuning of the software?
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