Diagnostic Guide: 2021 Ford Bronco sport Common Electrical Faults and Fixes

Ford’s Legacy of Power and Innovation: Diagnostic Guide for 2021 Bronco Sport Electrical Faults

You’re cruising down the highway, the music is playing, and suddenly—nothing. The engine dies, the dashboard goes dark, and you’re coasting to the shoulder with a dead vehicle and absolutely no warning. This isn’t a bad dream; it’s a reality some 2021 Bronco Sport owners have faced, and it’s almost always electrical.

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Here’s the uncomfortable truth about the 2021 Ford Bronco Sport: it’s a genuinely capable little off-roader with tons of charm, but its first model year came with a laundry list of electrical gremlins. The good news? Most of them are fixable—many for free under recalls or Technical Service Bulletins (TSBs). This guide walks you through the most common electrical faults, what causes them, and exactly how to get them fixed.

TL;DR;
The 2021 Ford Bronco Sport has been subject to at least 18 recalls, many of them electrical in nature . The most critical issues involve the Body Control Module (BCM) and Powertrain Control Module (PCM) failing to detect battery degradation, which can cause sudden engine stall and loss of electrical accessories . The 1.5L engine models face fuel injector cracks that can leak fuel—a fire risk addressed by multiple overlapping recalls . The 12-volt battery itself may suddenly fail due to manufacturing defects in certain Camel EFB batteries . Other common faults include rearview camera software glitches, moonroof detachment risks, and oil separator cracks . Most fixes are software updates or component replacements performed free at dealerships—check your VIN regularly .

Key Takeaways

Sudden Stalling Risk: A BCM/PCM calibration error affects over 456,000 vehicles—engine may stall without warning and hazard lights may fail .
Battery Defect: 2021–2023 models may have faulty Camel EFB batteries that degrade suddenly; Ford will replace them with AGM batteries free of charge .
Fuel Leak Hazard: 1.5L engines have fuel injectors that can crack and leak—multiple recalls address this, with final remedies still rolling out .
Rearview Camera Failure: A software glitch can cause blank camera displays or persistent images after backing .
Oil Separator Cracks: The 1.5L engine’s oil separator housing may crack, causing oil leaks .
DIY First Step: Always check fuses first—they’re easy to inspect and replace using the diagrams in your owner’s manual .

The Big One: Sudden Power Loss While Driving

Imagine driving down the highway and your vehicle just… stops. No warning, no sputtering—just silence and a dashboard full of warning lights. What causes this nightmare scenario?

This is the most serious electrical fault affecting the 2021 Bronco Sport, and it stems from a double-whammy of issues: defective batteries AND control modules that can’t detect the problem.

The BCM/PCM Calibration Disaster

In April 2024, Ford recalled over 456,000 Bronco Sport (2021–2024) and Maverick vehicles because the Body Control Module (BCM) and Powertrain Control Module (PCM) were not calibrated properly . As a result, these modules couldn’t detect if the 12-volt starter battery had degraded or failed, and the alternator couldn’t keep up with electrical demand .

What happens when this occurs:

The engine may lose power while driving—sudden deceleration with no warning
Electrical accessories like hazard lights may stop working
The vehicle may not restart after an auto stop-start event
In some cases, the steering and brakes can lose power assist

The fix: Dealers recalibrate both the BCM and PCM with updated software, free of charge . This recall is designated 24S24 (NHTSA campaign 24V267) .

“An undetected low battery charge can result in a loss of electrical accessories such as hazard lights, or cause a loss of drive power, increasing the risk of a crash” — NHTSA recall summary .

The Battery Itself Is the Problem

Here’s where it gets complicated: even with correct module calibration, the batteries in many 2021–2023 Bronco Sports are defective.

In January 2025, Ford announced a recall affecting 272,817 vehicles to inspect and potentially replace the 12-volt battery . The issue traces back to manufacturing defects in Camel EFB batteries, including:

Faulty Cast On Strap (COS) connections
Weak internal welds
Battery terminals placed too close to the strap wall, causing open circuits

The remedy: Dealers inspect the battery. If the vehicle already has a Ford-spec Absorbed Glass Mat (AGM) battery, no action is needed. If it has the suspect Camel EFB battery, dealers replace it with an AGM battery—completely free . The recall number is 25S02 .

Real Owner Experiences

A 2022 Bronco Sport owner shared a terrifying account: “It’s been twice in one month that I’ve had to tow the car on a flat bed because the car completely shuts down while driving. The first time left me stranded in the middle of the highway during rush hour. When it shuts down nothing works, absolutely nothing, not even the hazard lights. All electrical features are disabled, the wheels lock, can’t turn it back on” .

Another 2021 owner’s video went viral showing her car refusing to start, displaying a “Check Brake System” message, and making alarming beeping sounds—all traced to electrical system failures .

The Fuel Injector Saga: Fire Risk and Multiple Recalls

If you own a 2021 Bronco Sport with the 1.5L engine, pay close attention. This has been a multi-year battle with fuel injector cracks.

What’s Happening

Fuel injectors on some 1.5L engines can crack, allowing fuel to leak inside the engine compartment . This presents an obvious fire risk. The issue has spawned a tangled web of overlapping recalls:

Recall	Date	Action
22V-191	2022	Initial recall
22S73	2023	Engine control software update + drain tube
24V187	2024	Expanded recall
25S76	2025	Expanded again, replaces previous recalls

Current Status

As of late 2025, recall 25S76 covers 2021–2024 Bronco Sport and 2020–2022 Escape vehicles with 1.5L engines . The remedy is still under development, but as an interim repair, dealers update the engine control software to include fuel injector leak detection .

Important: Even if your vehicle was previously repaired under earlier recalls (22V-859, 24V187, or 25V165), you’ll need to have the new final remedy performed once available .

Other Common Electrical Faults

Rearview Camera Failure

A software error can cause the rearview camera to display a blank image—or worse, the image may persist on the display after you’ve stopped backing up . This affects multiple Ford models, including the 2021 Bronco Sport.

Recall 25S72 addresses this: dealers update the rearview camera software, free of charge .

Moonroof Detachment

This one sounds like something from a comedy, but it’s serious: on some 2021 Broncos, the moonroof glass may not have been bonded correctly to the frame and could detach while driving . That’s a literal hole in your roof—and a safety hazard for following vehicles.

Recall: Dealers inspect the moonroof glass date code and replace it if necessary .

Oil Separator Cracks

The 1.5L engine’s oil separator housing may crack, causing oil leaks . Recall 22S21 covers this: dealers inspect and replace the oil separator and seals as needed .

Brake Caliper Issues

Some 2021–2022 models had rear brake linings manufactured incorrectly, affecting braking performance and violating Federal Motor Vehicle Safety Standard No. 135 . Recall 21C31 addresses this, though the remedy was still under development as of late 2021 .

DIY Diagnostics: Where to Start

Before you panic and head to the dealer, there are a few things you can check yourself.

Check Your Fuses

If individual electrical components stop working—turn signals, seat warmers, the stereo—a blown fuse is the easiest fix . The 2021 Bronco Sport has two fuse boxes:

Passenger Compartment Fuse Box :

Located under the glove box
Contains fuses for: SYNC system, wireless charger, terrain management module, door modules, and more

Engine Compartment Fuse Box :

Located under the hood
Contains high-current fuses for: starter motor, cooling fan, ABS pump, blower motor, powertrain control modules, and more

How to check:

Find the correct fuse using the diagram on the fuse box cover or your owner’s manual
Pull the fuse and look for a broken wire inside
Replace with a fuse of the exact same amperage—never use a higher amp fuse

“Always disconnect the battery before replacing high-current fuses. Replacing a fuse with a higher amperage can cause serious damage to the wiring and could cause a fire” .

Use NHTSA’s VIN Tool

This is the single most important step for any 2021 Bronco Sport owner. Go to NHTSA.gov/recalls and enter your 17-digit VIN . This will show you every open recall for your specific vehicle.

Because recalls are issued over time—and some remedies are still in development—checking regularly ensures you don’t miss a critical fix .

Visualizing the 2021 Bronco Sport Electrical Issues

This chart shows the relative frequency and severity of common electrical faults based on recall data and owner reports:

2021 Ford Bronco Sport: Common Electrical Issues

Relative frequency and severity of common electrical faults (based on recall data).

What to Do If You Experience Electrical Problems

Step 1: Check for Open Recalls

Run your VIN through NHTSA’s recall website. If any recalls are open, schedule an appointment with your Ford dealer immediately—the repairs are free .

Step 2: Document Everything

If you experience intermittent issues that aren’t covered by a current recall, keep a log:

Date and time of occurrence
Outside temperature (some electrical issues are temperature-sensitive)
What you were doing when it happened (driving, starting, idling)
Any warning messages or lights
Photos/videos if possible

This information helps technicians diagnose intermittent faults.

Step 3: Visit the Dealer with Your Documentation

Show your service advisor the documentation. Mention specific Technical Service Bulletins (TSBs) if you’ve found them online. The 2021 Bronco Sport has TSBs for various electrical concerns, including:

Charging system fault messages after water fording
Sta-bar disconnect service required messages
Wiring harness interference issues

Step 4: Know Your Warranty Rights

Even outside of recalls, your 2021 Bronco Sport may still be covered:

New Vehicle Limited Warranty: 3 years/36,000 miles bumper-to-bumper
Powertrain Warranty: 5 years/60,000 miles
Emissions Warranty: Varies by component, up to 8 years/80,000 miles

If your vehicle is within these timeframes and mileage limits, many electrical component failures should be covered.

The Bottom Line: Is the 2021 Bronco Sport Reliable?

Consumer Reports notes: “We expect the 2024 Bronco Sport will be less reliable than the average new car. This prediction is based on data from the 2021, 2022, and 2023 models, plus the Ford brand scores” .

The 2021 model year—being the first—has the most unresolved issues. However, Ford has been proactive with recalls and TSBs. A 2021 Bronco Sport that has received all outstanding recall repairs and battery replacements is far more reliable than one that hasn’t.

One owner with over 78,000 miles on their 2021 Bronco Sport reported: “It runs as if it had 78 miles on it” — suggesting that once the gremlins are addressed, these vehicles can be quite durable.

FAQ Section

1. Why does my 2021 Bronco Sport suddenly lose power while driving?
This is likely the BCM/PCM calibration issue covered by recall 24S24. The control modules can’t detect battery degradation, leading to sudden stall and loss of electrical accessories . Dealers will recalibrate both modules for free.

2. How do I know if my Bronco Sport has the defective battery?
If your vehicle is a 2021–2023 model, it may be part of recall 25S02. Enter your VIN on NHTSA’s website to check. Dealers will inspect and replace the battery with an AGM unit if it’s the suspect Camel EFB battery .

3. Is the fuel injector problem fixed yet?
Partially. Recall 25S76 covers 1.5L engine vehicles, but the final remedy is still under development. Interim software updates add leak detection . Even if your vehicle was previously repaired, you’ll need the final fix when available.

4. My rearview camera is acting up—what’s wrong?
A software error (recall 25S72) can cause blank camera displays or persistent images after backing. Dealers will update the camera software for free .

5. Can I fix electrical problems myself?
For simple issues like a non-working turn signal or radio, check fuses first. The fuse diagrams are in your owner’s manual . For anything involving control modules, batteries, or safety systems, see a dealer—especially since most are covered by recalls.

6. How many recalls does the 2021 Bronco Sport have?
At least 18 recalls according to the Center for Auto Safety . These cover everything from electrical system failures to fuel leaks and brake issues.

7. Will Ford replace my battery for free?
If your vehicle is part of recall 25S02 and inspection shows the defective Camel EFB battery, yes—Ford will replace it with an AGM battery at no cost .

8. What’s a Technical Service Bulletin (TSB)?
A TSB is a document that tells dealership technicians how to diagnose and repair a common issue that isn’t safety-related enough for a recall. Your Bronco Sport has TSBs for water intrusion in connectors, generator failures after fording, and more .

9. My car won’t start and shows “Check Brake System”—what now?
This has been reported by multiple owners and often indicates a broader electrical system failure . Check for open recalls first, then have the vehicle towed to a dealer for diagnosis.

10. Is it safe to buy a used 2021 Bronco Sport?
Yes, but with caveats. Ensure all recalls have been performed (check the VIN), verify if the battery has been replaced under recall, and consider an extended warranty for peace of mind. A well-maintained example with completed recalls can be a great value.

References

Call to Action
Have you experienced electrical issues with your 2021 Bronco Sport? Drop your story in the comments below—what happened, how you fixed it, and whether the dealer handled it under recall. Your experience could help another owner diagnose their own gremlins!

Diagnostic Guide: 2021 Ford Bronco sport Common Electrical Faults and Fixes

Ford’s Legacy of Power and Innovation: Diagnostic Guide for 2021 Bronco Sport Electrical Faults