One of our company trucks has a no start condition. Verified no spark. Checked for 12v at pin A at ICM, have GND at pin B, checked for pulse from ECU to pin C, but no pulse on output pin D. Verifed cam and crank signal with HPTuners. Replaced ICM with same results. Have continuity from pin D at ICM to IGN coil. I'm lost here without real schematics/diag.

Sounds like it is missing two cylinders. Time to upgrade!

Seriously though:

Silverado 1500, right?

How many miles on it?

Any recent trauma (besides being a company truck with a V6 which means it gets beaten a lot)?

Is there power to the coil?

Another thought is to check for any blown fuses in the under hood panel.

I did check all relevant fuses yesterday, but boss said my priorities were on the bigger trucks and we will flatbed it down to the dealer and let them **** with it. Okie dokie.

Let us know how it comes out!