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I own a 2004 C5 convertible that has approximately 25,500 miles. I stored it for three months with a trickle charger. There were not any messages before storage.
Now I have the message, "service active handling" upon starting. Tried reset to no avail.
This posting of codes gets into an area that is entirely new...thus I am learning. I followed the procedure for extracting codes and for Number 28 - TCS is as follows:
1233HC
1234H
1235H
1248H
1282H
1283H
1288H
1295H
Thanks to all who emailed that codes were needed before one could tell what was the problem.