no comm

[BOTTLE FED]

I have a 98 C5 that I had starter issues on, so I had to swap the starter out a couple of times. Now when I switch it on, I have LOTS of messages and when I check the codes, it has "No Comm" on EVERY function
Have I blown a fuse, or is my PCM fried?

[blown00ta]

Fuses would be my first guess. I would say check the computer connectors but not easy to get to on c5.
My 98 ta would give me problems with trying to scan it. key was on position but said no power or interface not found. My computer was fried

[PitchblackC3]

Have you checked the PCM wiring under the battery. Common to be damaged from a leaking battery.

[NTIMID8]

I have a 98 C5 that I had starter issues on, so I had to swap the starter out a couple of times. Now when I switch it on, I have LOTS of messages and when I check the codes, it has "No Comm" on EVERY function
Have I blown a fuse, or is my PCM fried?

If the problem started when the starter was replaced you have the wires on the power lug/small ground to the block in the wrong spot. The main power and ground for the BCM/ECM from from those lugs. I often hear the cooling fans run with keyon when its wrong.

[BOTTLE FED]

As a follow up. this turned out to be a problem with the SCM shorting out. I removed the grounding terminal of the small, 3 wire link that goes to the seat and it corrected the problem and let the car start. I just removed the wire from the seat motor and put it back together and it worked perfect (???)