How To Fix Ford F150 Blind Spot System Fault?

Key Takeaways:

  • Clean the tail light as dirty tail lights can cause blind spot system malfunction.
  • Check for corrosion inside the blind spot module box and clean connections if needed.
  • Use a fully compatible scan tool to diagnose the exact fault.
  • Adjust driver’s seat, keep mirrors visible, and install reverse sensors to prevent blind spots.
  • Seek professional help from a mechanic if DIY fixes don’t work.


The blind spot monitoring system in Ford F150 trucks is an invaluable safety feature that helps alert drivers to vehicles in their blind spots. However, like any sophisticated technology, this system can sometimes malfunction and display error messages indicating a fault. When your F150’s blind spot system stops working properly, it’s important to diagnose and resolve the issue promptly to restore full functionality.

This article will provide a comprehensive, step-by-step guide to troubleshooting and repairing common Ford F150 blind spot system faults. We’ll outline the purpose of the system, explain how it works, and offer practical DIY tips for fixing problems based on insights from other F150 owners. You’ll also learn when it’s best to seek professional assistance with more complex repairs. Equipped with the information here, you’ll be able to understand blind spot system issues in your Ford F150, approach repairs with confidence, and optimize this vital driving aid.

Understanding how this safety system functions and gaining the ability to fix faults on your own terms provides peace of mind. You’ll no longer need to solely rely on dealership service visits. Let’s get started exploring solutions for restoring your F150’s blind spot monitoring performance.

How Does the Ford F150 Blind Spot System Work?

Before diving into troubleshooting specific issues, it helps to understand what the blind spot system is, how it functions, and why it’s useful.

The blind spot monitoring system uses two radar sensors located inside the rear tail light assemblies. When another vehicle enters your blind spot zone, usually around 10 feet from the rear bumpers, the system sends an alert. Most models activate a warning light in the corresponding side mirror. Some also produce audible alerts.

This technology helps compensate for the inevitable blind spots that exist around a vehicle. Checking blind spots by looking over the shoulder alone leaves room for error. The system provides an extra degree of confidence when changing lanes or maneuvering. For safety, the blind spot monitoring works at all speeds, not just highway driving.

Now that you understand the Ford blind spot system basics, let’s explore some potential faults and how to remedy them.

How to Troubleshoot Ford F150 Blind Spot System Issues?

1. Is a Dirty Tail Light Causing Faults?

According to a tip shared on the F150 Forum, a dirty tail light lens can potentially interfere with the blind spot radar sensors and cause occasional fault messages or strange behavior.

Try thoroughly cleaning the tail lights on the F150, especially around the inner sensor areas. Use a soft cloth with a mild soap and water solution. Make sure to fully dry the lenses afterward. Test if the problem disappears after removing built-up dirt or debris.

2. Could Corrosion Cause the Blind Spot System to Fail?

Interior corrosion is another possible culprit mentioned on the Ford Truck Enthusiasts Forums. The blind spot module box can accumulate corrosion over time.

Check for any visible oxidation on the module’s electrical connections. Remove the box from the vehicle if needed to inspect and clean the contact points. Use an electrical contact cleaner spray to dissolve corrosion. Properly reinstall the module and verify if performance improves.

3. Should I Use a Scan Tool to Diagnose Blind Spot Faults?

If cleaning or corrosion removal doesn’t successfully fix your F150’s blind spot errors, using an OBD-II scanner tool can help isolate the true cause.

According to advice on JustAnswer, a fully compatible scan tool is required to read the blind spot system diagnostics and pinpoint errors. Generic scanners may not delve deep enough into the system. Refer to your owner’s manual or an online OBD scanner tool guide to identify options that work with your truck’s make and model year.

Once connected, check for diagnostic trouble codes that may reveal system faults. Address any codes following repair procedures from the truck’s service manual or a repair guide.

4. How Can I Prevent Blind Spots and Avoid System Issues?

Making some simple mirror and seating adjustments can help maximize your natural blind spot visibility in everyday driving. This may reduce the occurrences of fault messages.

As suggested on VEHQ, set your side mirrors to point rearward in line with the edges of the rear window. Sit high enough to see this reflected view. You can also install rear or side sensors that beep when obstacles are close. Work on turning your head well to visually clear blind zones before changing lanes.

Developing these habits helps rely less on the blind spot technology day-to-day. Only use the system for supplemental confidence, not as a replacement for checking surroundings.

5. Should I Seek Professional Diagnosis for Persistent Issues?

If you’ve tried all the DIY troubleshooting tips for blind spot errors to no avail, your best option may be taking the F150 to an auto repair shop. Describe the symptoms in detail to the technician.

Ford dealer technicians and other qualified mechanics have advanced diagnostic capabilities beyond simple OBD scanners. They can perform in-depth system tests to isolate any electrical, sensor, or wiring faults. This expertise helps remedy persistent blind spot problems that require complex repair skills.

In some cases, they may need to update the system’s software calibration. Other times, replacing damaged or malfunctioning radar sensors is necessary. Seek professional assistance when you lack the tools, technical knowledge, or ability to fix the root cause.

Frequently Asked Questions about Fixing Ford F150 Blind Spot Issues

What are common blind spot system error messages?

Some examples of common fault messages are “Blind Spot Not Available,” “Blind Spot System Fault,” and “Blind Spot Disabled.” Icons representing the system may also flash or illuminate on the dashboard.

Why does my blind spot system work intermittently?

Intermittent operation can point to a loose wiring connection, buildup of dirt or moisture on sensors, or software glitches. Start troubleshooting by cleaning sensors, inspecting wires, and scanning for diagnostic codes.

Can I just replace a malfunctioning blind spot sensor myself?

While experienced DIYers can replace the radar sensors, it requires removing tail light assemblies. Incorrect installation risks new sensors not aligning properly.

Is it safe to drive with the blind spot system disabled?

You can safely operate the vehicle with the system disabled. Just take extra precautions by thoroughly checking blind spots visually and using your mirrors. Drive cautiously until repairs are made.

How can I tell if the blind spot module needs to be replaced?

If cleaning the module’s electrical contacts doesn’t resolve errors, scan tool diagnostics point to internal module failure, or you see physical damage, replacement may be required.

How much does a Ford dealer charge to diagnose blind spot problems?

Diagnostic fees vary by dealership but typically range from $100 – $200. Additional costs apply for actual repairs. Some issues may be covered under warranty.

Can aftermarket blind spot sensors be added to older F150s?

Yes. Affordable universal blind spot detection kits are available that provide audible alerts when vehicles occupy your blind zone.

What causes the blind spot sensors to get dirty and malfunction?

Road debris, mud, snow, and general environmental exposure can build up on the sensors. Even normal brake dust accumulating on tail lights can interfere with optimal performance over time.


Diagnosing and repairing issues with your Ford F150 blind spot monitoring system is crucial for restoring this vital driving aid and safety feature. While some problems can be addressed with DIY fixes, don’t hesitate to turn to a professional when needed. Paying attention to error messages, being willing to learn basic troubleshooting, and seeking help for complex repairs will keep your blind spot system running properly.

With the knowledge provided in this article, you now have a detailed reference for maintaining your F150’s blind spot monitoring performance. By methodically applying tips from other truck owners and repair experts, you can confidently handle any blind spot faults. Keep your family safe and get the most from your vehicle by proactively caring for this indispensable technology.


The Editorial Team at brings you insightful and accurate content on a wide range of topics. Our diverse team of talented writers is passionate about providing you with the best possible reading experience.