Right side fan uncontrollable

For MacBook Pro 15 2017

Why the right side fan speed is random ?

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We will need a bit more information here. Try installing the program https://www.tunabellysoftware.com/tgpro/ and take a snapshot of the application window to post here. the guide to adding photos can be found here Adding images to an existing question

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You might also run the onboard diagnostics. Restart your system and press the D key. Tell us what the error code is

Reference: Mac startup key combinations

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