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Note that if you encounter any difficulty reading codes, you should verify that the cigar lighter fuse hasn't blown and that there are no coins or cell phone chargers in the cigar lighter socket.
If the car is model year 1998 or newer, use an OBDII scan tool connected to the DLC.
If the car is model year 1995 or older, use an GM OBDI scan tool or use the paper-clip method.
For a 96 or 97, an OBDII scan tool is the preferred method, but an may be present behind the sound insulator under the dash. If you have an ALDL connector you have the option of using an OBDI tool or paper clip should you so desire.
Paper-clip method:
Install a jumper wire or paper clip between the last and second to last terminals from the left on the top row of the ALDL connector with ignition turned on. These are the first and second terminals from the right side of the top row of the connector. The check engine light will flash codes. The first code flashed will be 12 indicated by flash (1) pause flash flash (2) pause. Codes will be flashed twice before moving on to the next code. After all codes are flashed, code 12 will repeat. Three consecutive 12s indicate no codes.
Some older models do not flash 12 if there are codes present.
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