Start/Stop – Auto-stop exceptions

Start/Stop is a function that temporarily switches off the engine when the vehicle is not moving, for instance in heavy traffic or at a traffic light to help reduce fuel consumption.

In certain situations or conditions, the engine may not auto-stop when the vehicle comes to a standstill, such as if:

Condition/situation
The vehicle's speed has not reached a speed of approx. 6 mph (10 km/h) after the most recent auto-start or after the driver has started the engine.
The driver unbuckles his/her seat belt.
The main battery's charge is below the minimum level.
The engine has not reached its normal operating temperature.
The ambient temperature is below approx. 25°F (-4°C) or above approx. 85°F (30°C).
The windshield's heating function* is activated.
The climate system cannot keep the desired settings in the passenger compartment; the blower will operate at high speed.
The vehicle is backing up.
The main battery's temperature is below freezing or too high.
The driver is turning the steering wheel hard.
The road's incline is very steep.
A trailer's electrical system is connected to the vehicle.
The hood has been opened1.
The transmission has not reached its normal operating temperature.
Atmospheric pressure is below a level equivalent to an altitude of approx. 4,900–8,200 ft (1500–2500 m) above sea level. The actual pressure is also affected by current weather conditions.
The Adaptive Cruise Control's* Queue Assist feature is activated.
The gear selector is in the S2 or "+/–" position.
  1. * Option/accessory.
  2. 1 Certain engines only
  3. 2 Sport mode (where applicable)