All accessories work and it turns over but no spark to the wires?

There are no lights flashing when we turn on the ignition. The service engine light was on before these problems occurred due to a bad catalytic converter.

According to the mitchell online manual I have purchased, there is no ignition control module on these vehicles with a 5.3 L engine. There is mention of one on a 4.8 L engine. Is the ignition control module part of the PCM?

I believe there is a problem with the PCM because the scan code computer cannot make a connection with it. Is there one ignition control module for the engine or a separate one for each cylinder?

I know that the crank position sensor will cause the lack of spark, but I reason that the scan computer should be able to communicate with the PCM and mine can not. It does communicate well with my other Chevy, so I don't think the scan computer has failed.

I tried to get an ICM from the parts place nearby and we cannot come up with one for the Silverado 2000 5.3L engine. Should this be one part or is there a coil for every cylinder? I have replaced the ignition relay and all fuses are good.

Thanks

So there is a coil on each cyclinder, I would have to replace 8 coils correct?

Thanks

I will give the new PCM a try and post the results. If the PCM replacement does not do it, it will be time to tow the car and give up on the do-it-yourself effort!

Thanks

Hi. How did that new PCM work out? Having exact same problem.

The truck is unable to communicate with the scanner. Is powers up from the port but says unable to connect. All fuses have been checked and are good.
The security light comes on solid after sixty seconds with key on. It never goes off.
The truck cranks and starts for a quick second but will not stay running.
I replaced the passlock key housing, the key cylinder with new key and the ignition wiring harness but no luck.
I am debating whether to have it towed to dealer or try buying a new PCM. I have had four tech guys try to figure it out but no luck. I did the relearn of the new key. Key in start position, wait ten minutes, light stops blinking and repeat three times. It seems to have learned the key because light stops blinking, but the light comes back solid after sixty seconds like it is a different problem.
Any help would be appreciated and thanks Ken for the response!
2000 Chevrolet Express 3500 diesel
18,000 miles.

Thanks Ken for the great information! I am going to test this and get back ASAP!