Hello dear customer.thank you for your purchase.If you encounter product problems or operational problems and other problems, you can contact our customer service immediately, and we will solve the problem for you within 24 hours.Please be sure to contact our customer service.I wish you a happy life! ! ! Product Feature Compatible with GM cars made before 1996. Used for connecting OBD II scanner and vehicle with this 12 pin connector which is specifically for GM.Connectors: GM 12Pins OBD1 male connector; OBD2 16pins female connector. Please carefully compare the products 12 Pins and 16 pins plugs Is it compliant to match your car model and scanner plug. This product is an auxiliary product only. If not available, it may not be suitable for your scanner and car model. Product Specification Type:GM 12 Pin To OBD2 16 Pin Convertor Adapter OBD Interface:OBD,OBDII Connector 1:GM 12Pins OBD1 male connector Connector 2:OBD2 16pins female connector Cable Length:15.7in / 40cm Weight:3.40oz / 98g Package Included1 X OBD1 12 pin to OBD2 16 pin Convertor