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On a 2003 SSEi, I get Intermittent ABS, Brake, and Trac Off lights, with "Service Stability System on the DIC. It will come on and off randomly as I'm driving. Had the codes read - came up with C1298: PCM Class 2 Serial Data Link Malfunction.
At first I thought it was going to be the ABS Module. But now I'm not so sure.
Anybody ever have any experience with that code?

It still could be. This is some of the information regarding that code:

Possible causes of this DTC are the following conditions:

The EBCM has a class 2 serial data transmit fault.
The PCM has a class 2 serial data receiver fault.
The class 2 serial data line has an extremely high amount of traffic.
Loose or corroded EBCM ground or PCM ground.