FAQ: GM Code Scanner CP9001   How do I know if my vehicle is OBD I or OBD II on-board diagnostics equipped?   What is the difference between OBD I and OBD II cars?   What is OBD?   What are DLCs?   Common Chrysler OBD II (P1) Enhanced Codes   Will the Actron Code Scanners and/or Scan Tools retrieve Anti-Lock Brake or Airbag codes?   Do I need adapters for different vehicles?   What are I/M Monitors?   What is MIL Status?   What are Pending Codes?   What is the Erase Codes function?   Which Actron Code Scanners and/or Scan Tools work on 1994 & 1995 GM vehicles?   What are PIDs?   What are DTCs?   What are Enhanced OBD II codes?   Common Generic OBD II (P0) Codes   Common GM OBD II (P1) Enhanced Codes     Which Actron Code Scanners and/or Scan Tools work on 1994 & 1995 GM vehicles?   1994 & 1995 GM vehicles were equipped with several different engine computer systems. Follow these steps, in sequence to determine what diagnostic tool is right for your vehicle: 1. Find the PCM (Powertrain Control Module) in your vehicle: If the PCM is a black box with cooling fins located under the hood, your vehicle is most likely OBD II. To confirm that your vehicle is OBD II-compliant, check the Emissions Decal located in the engine compartment. If you determine that your vehicle is OBD II compliant, use either the SPANISH OBD II AutoScanner CP9138S, OBD II AutoScanner CP9135, PocketScan Code Reader CP9125, the SUPER AutoScanner CP9145 or the SUPER AutoScanner Kit CP9150. If the PCM is a silver box located in the interior of the vehicle, proceed to Step 2. 2. Find the DLC (Diagnostic Link Connector) under the dashboard, usually on the driver's side: If the DLC is a 16-pin D-shaped connector, your vehicle is OBD I-equipped, but with the OBD II connector. The proper tool is a SUPER AutoScanner CP9145 or the SUPER AutoScanner Kit CP9150. If the DLC is a 12-pin rectangular connector, proceed to Step 3. 3. If Pin "B" is present in the 12-pin connector: Use the GM Code Scanner CP9001or The SUPER AutoScanner CP9145 with a GM ALDL Cable CP9127 or use the SUPER AutoScanner Kit CP9150. 4. If Pin "B" is not present in the 12-pin connector: Use the SUPER AutoScanner CP9145 with a GM ALDL Cable CP9127 or use the SUPER AutoScanner Kit CP9150.