tax basis = tax basis at beginning of year + each LLC member's share of income less deductions (whether deductible or not) less credits - less distributions box 19 + certain liabilities (part II section k)
here's a link to a worksheet that should help.
https://tax.thomsonreuters.com/content/dam/ewp-m/documents/tax/en/pdf/other/quickfinder-updates/qpep...
no Turbotax doe not track basis. that's each member's responsibility.
if there's any activity in the LLC the members' tax basis will change
