Once your Hummer has been serviced you will need to reset the engine service light. Pick a tool below to reset service light for your Hummer & update your maintenence manual. Its is important for the service history of your Hummer that the oil reset light has been removed before you sell your car. Some tools will allow you to reset oil, brakepad, airbag & ABS lights. Diagnostic World are the number 1 site if you need to buy a service indicator reset tool.