Originally Posted by blue_bonn_evil
One way to make it easy for codes now and for later uses do what I did. Run to your local wal-mart or fleet-farm or large warehouse store and go to the automotive section. For $20 you can pick up a code reader and code book. It has come in handy quit a bit for me. The code reader plugs into a plug by the gas and brake pedal basically right below your steering column. All you do is plug it in turn the ignition on and count how many times your "service engine soon" light flashes it always flashes 12 first which is the diagnostics mode code which doesnt mean any thing and after that flashes 3 times it will tart flashing service codes to you. Its really easy and the code reader is fairly cheap. Hope that helps you. Oh the code reader is in a clear box with a clear incert and its just called a GM CODE READER. The only thing is it only goes up to 1995 gm vehicles because after 1995 they swiched from a 12 pin connector to a 16 pin connector. Good luck.
That won't work on a 94. The 'flash' feature was discontinued by GM after the 93 model year. You need a scan tool to read the codes for 94 and up. Oh, you just bought a 'code reader' when you could have used a paper clip! (sorry, couldn't resist that one!