Auto idle stop stopped working

Auto idle stop is designed to stay off whenever its conditions are not met, so it not activating is often not a fault. Common reasons include a battery that is not fully charged or is aging, very hot or cold cabin temperatures with the climate control working hard, the engine not fully warmed up, the steering wheel turned, or the system being switched off with its button.

The battery is the most frequent cause. The system protects the battery's ability to restart the engine, so a weak or partly discharged battery disables idle stop first. If you mostly drive short trips, the battery may never fully recharge.

We suggest a battery test as a first step. If the battery tests healthy and idle stop still never works, a shop can scan for stored codes and check the battery sensor.