Diagnostic Aids

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

This engine application may use 2 fuses, one for each bank, to supply ignition voltage to the ignition coils and also to the fuel injectors. A good indication that a fuse is open is that all misfire counters are incrementing on one side of the engine.
An open/high resistance on the low reference circuit to the ignition coil may cause a misfire.
An erratic or weak spark is considered a no spark condition.