CarMD is designed to work on all 1996 and newer vehicles driven in the U.S., with on-board diagnostic second generation (OBD2 or OBD II) technology.  This includes cars, light trucks, minivans, SUVs and hybrids – foreign and domestic.  A light-duty truck is any motor vehicle having a gross vehicle weight rating (curb weight plus payload) of no more than 8,500 pounds (3,855.5 kg).  

To see if your vehicle is compliant, look for a sticker that says OBD-II or OBD2 under the hood, or in the vehicle's service manual.