It could be a kink in the line. PEX is tough, but it can be kinked if the radius of a bend is too sharp.. There are metal and plastic bend supports to snap onto the PEX so it will bend without kinking. The person in the assembly line might have forgotten to install one on yours, or they cut it too short and decided to assemble it anyway.
I'd disconnect the cold water feed from the back of the outside shower faucet, have someone turn on the pump or city water and see if what comes out is a trickle or stream. If it's a trickle, your problem is a bad faucet or debris in the faucet. If it's a trickle, your problem is debris or a kinked line upstream from the faucet.
Depending on how handy you are would depend on what you do from there, cleaning/replacing the faucet or tracking down the debris/kink, respectively.
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