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Just to give you an idea, the '08 Cummins HD products (the first ones with DPFs) are on their 42nd software revision now. The '11 products are on their 18th.
Yeah, 2 wire data-link/CAN. Many smart devices: EGR valve, turbocharger, upsteam NOx sensor, downstream NOx sensor, and exhaust ECU. All communicating with the ECM (brain) over the engine's very own CAN Bus (2-wires). Like high speed internet. And the ECM communicates with the trucks ECM and ABS ECU and transmission ECU (if equipped). The trucks ECM communicates with the chassis node (powers exterior lighting). All normal fare for quite some time now. HD truck diesels have all been fly by wire for 20 years now. Detroit in '88 or so, Caterpillar in '95, Cummins in '92.
The beauty of CAN systems is they really aren't hard to diagnose. It's only two wires. Fault code based diagnostics has come a long way, and any little glitch triggers a fault. 2013 will bring EPA mandated OBD diagnostics to all trucks which should help even more.
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