Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
The PCM does not need to be flashed after the procedure, however, to clear the code you will need to remove the "NEG" from the battery for 15min. Make sure you have a working keyfob for your alarm and a radio code (if equipped) as these systems usually rest using this code clearing method as well.
To tell the truth, that's exactly what I do. This way, while you are making the repair, the computer is clearing the codes.