Ford Fusion auto start/stop not working – troubleshooting guide in 2023!

The auto start-stop feature is designed to save fuel and reduce emissions by automatically shutting down the engine when the vehicle comes to a stop. However, if you find yourself here, you’re likely facing an issue with this feature. 

The Ford Fusion auto start-stop is not working due to a low or dead battery, as well as factors like Forscan disabling A.S.S. and BMS, an open driver door, an unfastened seatbelt, high altitude, a heated windshield, or manual transmission mode.

Fear not; this article will explore the reasons behind this problem, troubleshooting methods, and expert insights to ensure you confidently get back on the road.

Understanding The Ford Fusion Auto Start-Stop System – For Those Who Don’t Know!

The Ford Fusion Auto Start-Stop System
Source: youtube

Before moving towards solutions to this issue, it’s essential to understand how the Ford Fusion auto start-stop system works. The auto start-stop system is designed to preserve fuel by automatically shutting off the engine when your vehicle comes to a complete stop. 

This occurs, for example, at a traffic light or in heavy traffic. It then restarts the engine when you release the brake pedal or accelerate. This technology not only reduces fuel consumption but also minimizes emissions.

Let’s discuss how to troubleshoot and resolve these problems effectively:

Troubleshooting Ford Fusion Auto Start/Stop Issues – Resolve This Issue ASAP!

1. Inspect The Battery

  • Start by checking the battery’s health.
  • Ensure the battery is properly charged.
  • Check for any corrosion on the battery terminals.
  • If your battery is getting old or not working well, consider getting a new one.
  • Replacing the battery can help restore the auto start-stop function.
  • As per my experience, I suggest examining the battery first,  which is connected to the engine. I quickly resolved the auto start/stop problem by replacing the battery and restoring better performance.

2. Examine Electrical Connections

  1. Inspect the vehicle’s electrical connections, including wiring and fuses.
  2. Replace any damaged components.
  3. Ensure that all connections are secure.

3. Re-Enable A.S.S. And BMS

  • Connect your vehicle to Forscan.
  • Access the Forscan software and navigate to the settings related to A.S.S. and BMS.
  • Look for options to re-enable these systems.
  • Follow the instructions in Forscan to turn these features back on.

Note: If you are not comfortable using Forscan or cannot locate the necessary settings, it’s advisable to consult a professional mechanic or a Ford dealership. They have the expertise and tools to access the vehicle’s settings and properly re-enable the A.S.S. and BMS systems.

4. Ensure Driver Door Closure And Seatbelt Fastening

Driver’s Door: Make sure the door is securely closed before driving. The auto start-stop system is designed to function when the vehicle is ready, including having all doors closed.

Seatbelt Fastening: Fasten the seatbelt properly before driving. The auto start-stop feature often requires the driver to be securely belted in for safety reasons.

5. Use Automatic Transmission Mode For Auto Start-Stop

  • Switch your vehicle’s transmission mode from manual (M) to automatic (A) or the equivalent setting, if available.
  • In automatic mode, the auto start-stop system will function as intended, allowing fuel-saving engine shut-offs when appropriate.
  • This switch ensures that you can enjoy the benefits of improved fuel efficiency during your drives.

6. Seek Professional Help

If you’ve exhausted the above troubleshooting steps without success, it’s time to consult a professional mechanic or Ford dealership. They have the expertise and tools to diagnose and repair more complex issues.

Finally! You’ve completely learned every possible solution. Now let’s explore The reasons behind this issue with the Ford Fusion.

The Factors Behind This Issue – Let’s Take Analysis!

1. Battery Issues are considerable

Battery Issues are considerable
Source: team-bhp

A weak or faulty battery is a common reason for auto start-stop malfunctions. The system relies on a healthy battery to restart the engine after a stop. If your battery is struggling, it can result in this problem.

2. Forscan Disabling A.S.S. and BMS

It is a diagnostic tool that allows users to adjust their vehicle’s settings, including disabling features like Auto Start-Stop (A.S.S.) and Battery Monitoring System (BMS). When these features are disabled, it can disrupt the auto start-stop functionality.

Impact: If A.S.S. and BMS are intentionally disabled using Forscan, the auto start-stop system will not work as intended, resulting in continuous engine operation.

You must watch the YouTube video to disable auto start/stop using Forscan permanently.

3. Open the driver’s door and unfasten the Seatbelt

The auto start-stop system often requires the driver’s door to be closed and the seatbelt securely fastened before it engages. These conditions ensure the vehicle is ready for safe operation.

Impact: If the driver’s door is open or the seatbelt is unfastened, the system may not activate, as it prioritizes safety. This can lead to the auto start-stop feature not functioning.

4. Issue Of The High Altitude

The air contains less oxygen at high altitudes, affecting engine performance. To maintain performance and safety, some vehicles disable or reduce the frequency of the auto start-stop system.

Impact: When driving at high altitudes, you may notice that the auto start-stop feature engages less frequently. This is a normal adaptation to altitude conditions.

5. Heated Windshield Activated

To maintain cabin comfort, the auto start-stop system may be intentionally disabled when the heated windshield is active. This prevents frequent engine restarts during cold weather.

Impact: While the heated windshield is on, the auto start-stop system may not engage until the system deems it appropriate. This behavior is designed to enhance driver comfort.

6. Electrical Problems

Issues with the vehicle’s electrical system can also impact the auto start-stop function. Faulty wiring, blown fuses, or damaged connectors can disrupt the system’s operation.

  • As a Ford owner, I’ve encountered this problem linked to the A.S.S. due to the damaged connectors and fuses. Trust me, by resolving this issue, I get excellent performance. 

7. Consider Environmental Factors

If you live in an area with extreme temperatures, understand how the system behaves in these conditions. In very hot or cold weather, the auto start-stop system may not function as frequently, which is normal behavior.

Congratulations! These were some of the reasons and solutions for Ford’s auto start/ stop not working. Read the data on this Forum-Based Website for a next-level understanding of this issue.

Frequently Asked Questions

1. How do I reset a Ford start-stop system?

To reset a Ford start-stop system, press and hold the start-stop button for 5-10 seconds while the engine runs. Release the button, turn off the engine, and restart the vehicle to confirm the reset.

2. How long should a stop-start battery last?

A typical stop-start battery can last anywhere from 3 to 5 years, depending on factors like driving habits, climate, and the quality of the battery. Regular maintenance and usage in moderate conditions can help extend its lifespan.

3. Can I replace a start-stop battery myself?

Yes, you can replace a start-stop battery if you have the necessary tools and automotive knowledge. However, following safety precautions and consulting your vehicle’s manual for specific instructions is essential, as the process may vary by make and model. 

Bottom lines:

Let me conclude it, 

You can efficiently resolve the issue by checking the battery’s health, re-enabling the A.S.S. and BMS, using an automatic transmission, and consulting a Ford dealership or mechanic for diagnostics and repairs.