Also, on the BAT Auto Technical Forum, I had a fellow respond in this way, referring perhaps to a possible ground fault sutuation:
ok at my shop i have seen this problem ok i would change the fluid if this is a 8 speed use mobil 1 LV HP also and a bottle of Motorcraft XL-3 trust me it work's great on the shudder problem also a new filter now onto the can bus line issue on the driver side down by the frame you should see a big connector just below the manifold check there for a issue unplug and clean good and drive it again see what happend
We (and Claude) NEED all the codes to help steer this.
If the service manager won't budge and give you a detailed diagnostics with all DTCs, we and Claude are sitting duck.
If the SM won't budge, call GM customer service and get them to provide you that info from the dealer.
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