Replaced valve cover gaskets now it doesn't crank

Question

Replaced upper gaskets now it won't crank over code UO100 comes up any idea how to fix

Answer 1

In order to do the valve cover gasket you have to remove the upper intake there is a important ground , this ground is for the ECM on the engine at the top left corner it either there or the rear center of the top. make sure that ground is proper.