buick park avenur p0300 code

Question

Will start fine, but lacks power can only get up to 15mph.

Answer 1

Hi there,

This code is for a multiple cylinder misfire. There could be several causes but I would start with new coils and wires. Possibly spark plugs. Also look for a possible plugged up catalytic converter. If the converter is plugged it can cause the codes and the complete lack of power.