OBDII Code Info
If your diagnostic connector looks like this one,then you have an OBDII sytem,and it requires a scanner to access the codes.Scanners can be found from the links on the homepage.All vehicles after 96 have the OBDII systems and some 95 models,too.
OBDII Code Definitions

OBDII P Codes

OBDII B Codes

OBDII C Codes

OBDII U Codes

 

Pin 2 - J1850 Bus+
Pin 4 - Chassis Ground
Pin 5 - Signal Ground
Pin 6 - CAN High (J-2284)
Pin 7 - ISO 9141-2 K Line
Pin 10 - J1850 Bus
Pin 14 - CAN Low (J-2284)
Pin 15 - ISO 9141-2 L Line
Pin 16 - Battery Power

Some 1995 GM vehicles have the 16-pin connector but have accessible OBD-I codes. Check the underhood emissions sticker to confirm, and if yours is OBD-I, the codes are accessed by bridging terminals 5 and 6. If your vehicle is OBD-II, a scan tool or computer is required to access the codes.

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