Diagnostic engine trouble codes for General Motors vehicles are available at OBD-Codes.com, Engine-Light-Help.com and TroubleCodes.com as of 2015. Additional sources for General Motors trouble codes include GMTuners.com and DirectSearch.net.
OBD-Codes.com is an on-board diagnostics resource website that provides description of specific trouble codes for a variety of vehicle manufacturers, including GM, Chrysler and Ford. The website also provides troubleshooting tips, symptoms and possible solutions.
Engine-Light-Help.com is another on-board diagnostics website that features a comprehensive list of domestic and import diagnostic trouble codes. The website also offers resources such as automotive repair articles, sensor information, wiring diagrams, and component locations and specifications.