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Jim
Not familiar with the article or the codes being presented with these numbers
The "Serial Interface" code between the ACC and instrument cluster is present on most all of these. The interface isn't used until much later.
One problem I do know of that can cause this is the evap temp sensor. Maybe you can figure out how to monitor that and compare when it's operating fine and when it's in a failed state. Easy to replace.
Gilly
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