MacBook Pro does not power on unless power cord is plugged in?

Replace you battery.

About Mac notebook batteries - Apple Support

https://support.apple.com/en-us/HT204054

Determine battery cycle count for Mac notebooks - Apple Support

https://support.apple.com/en-us/HT201585

Batteries - Maximizing Performance - Apple

https://www.apple.com/batteries/maximizing-performance/


Apple Portables: Troubleshooting MagSafe adapters

https://support.apple.com/en-us/HT203207

See if you qualify:

13-inch MacBook Pro (non Touch Bar) Battery Replacement Program- October 2016 and October 2017

https://support.apple.com/13inch-macbookpro-battery-replacement

15-inch MacBook Pro Battery Recall Program- September 2015 and February 2017

https://support.apple.com/15-inch-macbook-pro-battery-recall

JoJoMoney Said:

“MacBook Pro does not power on unless power cord is plugged in?“

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Reset your SMC and your NVRAM:

Sometimes changes are made to the system and then settings (i.e. for the power ports) become manipulated, technically. So, reset both on your Mac.

JoJoMoney Said:

”Thanks!”

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You are welcome!