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Here is a link with some more info on the error code. But no help on a solution. Seem to be same car as yours. http://forums.corvetteforum.com/c4-tech-performance/2579168-1991-error-codes-c41- -c51.html Here's another http://www.justanswer.com/chevy/2b4kn-93-corvette-ccm-dtc-c41-indicates-problem-- communication.html And another http://www.10w40.com/questions/auto-problems-questions/1990-corvette-that-lost These all came from a google search for 'c41 error' and 'c41 corvette'. Could be a PCM module, a bad wire somewhere in the data communication wiring. Doesn't look like an easy find or fix.