Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual: ECO start/stop function

Operation of the ECO start/stop function

Vehicles without a 48 V on-board electrical system (EQ Boost technology)

Mercedes-AMG vehicles: observe the notes in the Supplement. Otherwise, you may fail to recognize dangers.

The engine is switched off automatically in the following situations if all vehicle conditions for an automatic engine stop are met:

• Vehicles with automatic transmission: You brake the vehicle to a standstill in transmission position D or N.

Vehicles with automatic transmission:

If you switch on the HOLD function or select a transmission position other than R, the engine will automatically stop in the following situations:

• you stop behind a vehicle that is pulling away.
• you stop at a stop sign when there is no vehicle in front of you.
• you turn the steering wheel hard at a low speed.

The engine is restarted automatically if:

• vehicles with automatic transmission: in transmission position D, you release the brake pedal when the HOLD function is not active.
• vehicles with automatic transmission: you shift into transmission position D or R.
• you depress the accelerator pedal.
• an automatic engine start is necessary.

If the engine was switched off by the ECO start/ stop function and you leave the vehicle, a warning tone sounds and the engine is not restarted.

The Vehicle Operational Switch the Ignition Off Before Exiting display message also appears in the multifunction display. If you do not switch off the ignition, the ignition is automatically switched off after three minutes.

Vehicles with a 48 V on-board electrical system (EQ Boost technology)

The engine is switched off automatically in the following situations if all vehicle conditions for an automatic engine stop are met:

• you brake the vehicle to a standstill in transmission position D or R.
• you depress the brake pedal while traveling at a low speed.

If you switch on the HOLD function or select another transmission position R, the engine will automatically stop in the following situations:

• you stop behind a vehicle that is pulling away.
• you stop at a stop sign when there is no vehicle in front of you.
• you turn the steering wheel hard at a low speed.

The engine is restarted automatically if:

• you release the brake pedal in transmission position D when the HOLD function is not active and one of the following conditions is given:
  • the drive program or is not selected
  • the drive program or is selected but the vehicle does not start to move.
  • the drive program or is selected, the vehicle moves at a speed of more than 15 mph (20 km/h) and Glide mode is not activated.
• you engage transmission position D or R.
• you release the brake pedal, the vehicle is not in Glide mode and it starts to move on a gentle downhill gradient at a speed below 2 mph (3 km/h).
• you depress the accelerator pedal.
• an automatic engine start is necessary.

If the engine was switched off by the ECO start/ stop function and you leave the vehicle, a warning tone sounds and the engine is not restarted.

The Vehicle Operational Switch the Ignition Off Before Exiting display message also appears in the multifunction display. If you do not switch off the ignition, the ignition is automatically switched off after three minutes.

Deactivating or activating the ECO start/ stop function

• Press button 1.

  If indicator lamp 2 lights up, the ECO start/ stop function is activated.

Depending on the model and the vehicle equipment, the button may also be located at a different position in the center console.