The speedometer is its own computor (module) and can display error for several differnt issues. It can be a speed senser, trans output speed senser, or even an internal error with the proccessor inside the cluster. Best to have it scanned to determine.
SOURCE: No Bus Error
All the modules are connected together to communicate with each other via the PCI bus. It is possible that one of the modules is pulling the bus down.Since the vehicle won't start it could be any one of the modules. It will be a process of elimination to find the faulty one by disconnecting them one at a time. Here are a few, powertrain control module (the one you replaced) Instrument cluster, overhead console, anti-lock brakes, airbag. Since the cluster unplugged wont read anymore, just try to start the vehicle to see if that was the one. Otherwise see if the odometer message of "no bus" goes away after each one is unplugged.
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