CCan code 0300 indicate a cracked exhaust manifold bad crankshat problem

Question

2009 TrailBlazer 4.2 6th cyl. coil replaced but check engine light stay on?

Answer 1

Hi there

Normally a cracked exhaust manifold will not cause this type of code. If the coil didn't resolve the issue then check the spark plugs, check for intake manifold leaks and also check for low fuel pressure.