Ford S MAX Start Stop Not Working

The Ford S MAX start stop system is designed to help reduce fuel consumption and CO₂ emissions by stopping the engine when it is idling. Versions of the S Max that uses auto stop start technology have an enhanced starter motor that is designed for an increased number of engine starts and a battery that can also handle increased starts.

There are numerous checks the start stop system must go through before auto stop is induced. If your Ford S MAX start stop is not working, it’s likely one or more of these checks has failed and as such, auto stop will be unavailable. In such instances, you may receive the message: Auto Start Stop Not Available. The start stop system makes the following checks and will not initiate:

• If you have opened the driver door.
• If the hood / bonnet is open.
• If the accelerator is operated.
• If you have unfastened the driver seat belt.
• If your vehicle is at a high altitude.
• If you have switched the heated windshield on.
• If the engine is warming up.
• If the engine coolant temperature is too hot or too cold. Auto stop initiates when the coolant temperature is greater than 60°C and less than 115°C.
• If the transmission oil temperature is too hot or too cold. Auto stop initiates when the transmission oil temperature greater than 10°C and less than 120°C.
• If there is not adequate vacuum in the brake booster.
• If there is intervention from functions such as brake assist / ABS etc.
• If the the diesel particulate filter is being regenerated.
• If there is intervention from functions such as level and distance regulation.
• If the steering wheel angular velocity is not within the specified value range.
• If the outside temperature is too low or too high.
• If the battery charge is low, usually lower than 75 percent. Battery charge is often the main cause of the Ford S MAX stop start not working. Have your battery tested or attempt charging your battery to enable auto stop.
• If the catalytic converter temperature is too high in relation to the engine coolant temperature.
• If the battery temperature is outside the optimal operating range/ below -5°C or above 60°C.
• If the internal vehicle temperature is not within the parameters set.
• If the outside ambient temperature is too hot or too cold. Usually from below -5°C or above 35°C.

More about the Ford S-Max
Ford S MAX Dashboard Warning Lights
Ford S MAX Warning Messages
Ford S MAX Start Stop Not Working