Your Ford Expedition’s Auto Start/Stop is Not Working? Here’s Why!

Do you own a Ford Expedition and are frustrated by the auto start-stop system not working You’re not alone. This is a common problem that can be caused by a variety of issues. In this guide, I’ll walk you through the steps to troubleshoot the problem and get your auto start-stop system working again. So whether you’re a DIYer or just need some help, read on for all the information you need.

Reasons Why Ford Expedition Auto Start Stop Not Working

Here are the reasons:

Engine Coolant Temperature Sensor

The engine coolant temperature sensor (ECT) sends a signal to the powertrain control module (PCM) about the engine’s coolant temperature. If the ECT is faulty, the PCM may not be able to properly calculate the engine’s temperature, which can cause the auto start-stop system to malfunction.

Throttle Position Sensor

The throttle position sensor (TPS) tells the PCM how far the throttle is open. If the TPS is faulty, the PCM may not be able to properly control the engine’s idle speed, which can cause the auto start-stop system to malfunction.

Engine Oil Pressure Sensor

The engine oil pressure sensor (OPS) sends a signal to the PCM about the engine’s oil pressure. If the OPS is faulty, the PCM may not be able to properly control the engine’s oil pressure, which can cause the auto start-stop system to malfunction.

PCM

The powertrain control module (PCM) is the main computer that controls the engine, transmission, and other vehicle systems. If the PCM is faulty, it may not be able to properly control the auto start-stop system.

How to Troubleshoot: Ford Expedition Auto Start Stop Not Working

Symptoms

There are a few symptoms that you may experience if your Ford Expedition’s auto start-stop system is not working properly. These include:

The engine does not automatically shut off when you come to a stop.
The engine does not automatically start back up when you take your foot off the brake pedal.
The auto start-stop system light is illuminated on the dashboard.
The auto start-stop system is disabled in the vehicle’s settings.

Causes

There are a number of potential causes for a Ford Expedition’s auto start-stop system not working properly. These include:

A faulty battery.
A faulty alternator.
A faulty starter motor.
A faulty throttle position sensor.
A faulty electronic control unit (ECU).
A loose or damaged wiring harness.

Troubleshooting

To troubleshoot the issue, you will need to first identify the cause. You can do this by following the steps below:

1. Check the battery voltage. The battery voltage should be between 12.6 and 12.8 volts. If the battery voltage is below 12.6 volts, the battery may be faulty and will need to be replaced.
2. Check the alternator output. The alternator output should be between 13.5 and 14.5 volts. If the alternator output is below 13.5 volts, the alternator may be faulty and will need to be replaced.
3. Check the starter motor. The starter motor should be able to turn the engine over smoothly. If the starter motor is not working properly, it will need to be replaced.
4. Check the throttle position sensor. The throttle position sensor should be able to accurately measure the position of the throttle valve. If the throttle position sensor is not working properly, it will need to be replaced.
5. Check the electronic control unit (ECU). The ECU is responsible for controlling the auto start-stop system. If the ECU is faulty, it will need to be replaced.
6. Check the wiring harness. The wiring harness for the auto start-stop system may be loose or damaged. If the wiring harness is damaged, it will need to be repaired or replaced.

Resetting the Auto Start-Stop System

If you have determined that the auto start-stop system is not working properly, you can try resetting it. To reset the auto start-stop system, follow the steps below:

1. Turn off the engine.
2. Press and hold the start button for 5 seconds.
3. Turn on the engine.

The auto start-stop system should now be reset.

Conclusion

If you have tried troubleshooting the issue and resetting the auto start-stop system, and the problem persists, you will need to take your vehicle to a qualified mechanic for further diagnosis and repairs.

Also Read: Ford Expedition Aux Input Not Working

FAQs: Ford Expedition Auto Start Stop Not Working

Why is my Ford Expedition’s auto start stop not working?

There are a few possible reasons why your Ford Expedition’s auto start stop may not be working. Here are some of the most common:

The battery is low: The auto start stop system uses a small amount of power to operate, so if your battery is low, it may not be able to start the engine.

The engine is overheating: The auto start stop system will not work if the engine is overheating, as it could damage the engine.

The system is malfunctioning: The auto start stop system is a complex piece of machinery, and it is possible for it to malfunction. If you think that your system is malfunctioning, you should take your vehicle to a Ford dealership for diagnosis and repair.

How do I reset my Ford Expedition’s auto start stop system?

To reset your Ford Expedition’s auto start stop system, follow these steps:

1. Turn off the engine and remove the key from the ignition.
2. Press and hold the start/stop button for 10 seconds.
3. Turn the key to the On position and release the start/stop button.
4. Start the engine.

How do I turn off my Ford Expedition’s auto start stop system?

To turn off your Ford Expedition’s auto start stop system, follow these steps:

1. Press the start/stop button once.
2. Press the start/stop button again to turn off the system.

Is it bad for my Ford Expedition’s engine to have the auto start stop system turned on?

There is no definitive answer to this question, as the effects of the auto start stop system on an engine can vary depending on the specific engine and driving conditions. However, in general, the auto start stop system is not harmful to an engine. In fact, it can actually help to improve fuel economy and reduce emissions.

Should I get the auto start stop system for my Ford Expedition?

Whether or not you should get the auto start stop system for your Ford Expedition depends on your individual needs and preferences. If you are looking for a way to improve fuel economy and reduce emissions, the auto start stop system can be a good option. However, if you are concerned about the potential wear and tear on your engine, you may want to consider getting a vehicle without the auto start stop system.