Describe the desired behaviour clearly

Depending on the vehicle, engine management, the electrical system and other control units may be involved in start-stop operation. Different requests must therefore be distinguished, such as behaviour after a restart or use of an existing control button. A general option does not confirm that every variation can be implemented. Provide model, year, engine and control unit details, and describe the expected result. For hybrid vehicles, clarify exactly which type of engine shutdown is intended.

Consider system condition and consequences

An unavailable start-stop function may also result from operating conditions or the condition of associated components. Messages or unexpected behaviour should therefore be investigated first. A modification does not replace checks of the battery, sensors or energy management system. A software request requires a suitable source file and details of previous changes. Whether editing is appropriate and supported is assessed for the specific vehicle. Effects on use and consumption, and whether the change is permitted, must be considered beforehand.

Frequently asked questions

Is every engine shutdown a start-stop function?

No. Particularly in hybrid vehicles, engine shutdown may be part of the powertrain concept and controlled differently.

Will a modification solve battery problems?

No. Battery or energy management problems require their own diagnosis and, where necessary, repair.