2021 Ford Bronco Sport acceleration problems

Filed Aug 16, 2026 · Acceleration, Brakes · KY · crash

Pre-Collision System warning activated unexpectedly. The vehicle then accelerated by itself unexpectedly and the accelerator/throttle was engaged by itself. Breaks were then hard to push and vertically impossible to slow down. At the time, there was no vehicle or obstruction immediately around the vehicle other than a possible box, or small obstruction in the road. Yes the vehicle is available for inspection upon request. Due to the unexpected activation of the pre-collision system followed by unexpected acceleration by itself, caused the vehicle to move unexpectedly and resulted in a collision with another vehicle, creating a safety risk to the occupants of both vehicles. No. The problem has not yet been reproduced or confirmed by a dealer or independent service center. No. The vehicle has not yet been inspected by the manufacturer, police, insurance representatives, or any other party. The police did come to the accident and a police report was filed. Yes. The vehicle's Pre-Collision System warning activated unexpectedly immediately prior to the incident. There were no other known warning lamps or messages before the vehicle unexpectedly accelerated by itself and collided with another vehicle.

Filed Oct 14, 2025 · Acceleration, Fuel system · IN

!!!ALWAYS GET A SECOND OPINION WITH "TRANSMISSION ISSUES"!!! I will NEVER get a Ford again! I'm updating my previous issue #11688946 I received my 2021 Ford Bronco Sport in early 2023. I noticed a shutter when accelerating from a stop, I took it to the dealership and had the 3rd fuel injector recall completed (still waiting for a remedy to the most recent #25V467). The dealership stated my vehicle should run fine now. The shutter persisted and worsened and a new issue developed, my RPM's would slightly bounce while going at a steady speed. 09/19/2025 BACK TO THE DEALERSHIP I GO!Just for them to "diagnose" the issue I had to pay $165.00. AND they tried to charge me double stating it took them 2hrs. My BS was dropped on less than 2hrs of them calling me. DIAGNOSIS: torque converter. They recommended a flush and fill for $300-$400. 09/25/2025 I bought an OBD-II and plugged in to see if there were any codes. The codes I got make way more sense than a new transmission. -U0140:00-08--BCM missing communication -U1A00:87-08--APIM private communication network malfunction -U2013:01-08-- Switch pack issue Also the EVAP system vapor pressure as well as Oxygen sensor current (B1-S1) is functioning incorrectly and randomly drops below the normal range. My transmission is fine... All they had to do is updated/reset my BCM when they had it as well as perform a "relearn". But they didn't!!! Clearly these are not always transmission issues but service work is what makes dealerships more money.

Filed Sep 1, 2025 · Acceleration, Engine · TN

Car was put into drive and wouldn’t go. It would finally go but Everytime the engine changed gears it dropped to 0 rpm’s making it very dangerous to drive!!! Lots of lights came on and my app sent me two things wrong with it. After having it checked the codes said it was a valve body issue. Replacing the transmission is $4000, and I’m not the first with this problem a friend of mine had the same issue a couple weekend before me.Had two mechanics one of which was from the dealership tell me this was happening a lot! It’s very dangerous especially when you have kids in the car like I did and are having to stop at red lights and such. There were no issues or lights to show warning of this happening either.

Filed Jul 26, 2025 · Acceleration, Electrical · VA

My car would not move or go into gear. I was told it was my transmission but the diagnostic said it’s my powertrain control module. The mechanic finally admitted he broke my transmission. My Bronco is still sitting at the service department of the dealership. I have not had my vehicle since June 6, 2025. All I get is still ordering parts! I need a vehicle this is my only source of transportation and now I’m borrowing daily from family members. I don’t understand why they didn’t look into the powertrain from the beginning.

Filed May 22, 2025 · Acceleration, Engine · TX

I have attached a letter that I mailed to Ford Consumer Affairs detailing the issues with this vehicle and asking them to repair the transmission. I received a response letter from them yesterday denying my claim. I am seeking advice on how I can proceed with Ford, if at all, to try to get them to fix this issue that was clearly caused by multiple recalls. I am not the only consumer reporting the exact same problem with this vehicle. Thank You, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Apr 20, 2025 · Acceleration, Transmission · TX

Purchased the Bronco Sport brand new in September 2021. Almost from the outset, the vehicle has been a nightmare. We just purchased our third battery. The vehicle died at an intersection and had to be towed to the dealership. They replaced the battery but it again failed. We have experienced numerous electrical issues with the vehicle as well as with the brakes and the power train. We have had the shift system fault notification come on several times. We took it in to the dealership who made some repairs and the notification went away for awhile. However, most recently, we were driving the vehicle down the interstate when it suddenly would not accelerate. We were very lucky to be able to maneuver the vehicle onto the shoulder. After a few minutes, the vehicle started and we were able to drive it home very slowly on side roads. We took the Bronco Sport to the dealership again and notified them of the multiple trips we had made there to fix this code issue. The dealership did a diagnostic and had a transmission specialist look at the car. The conclusion was that we needed a brand new transmission to the tune of $11K. Additionally, the dealership stated that we likely had rear differential issues as well - the subject of one of the many recalls on this lemon of a vehicle. We have not had the diagnostic performed as we are waiting on Ford to let us know if they will buy back the vehicle. Again, we purchased the car new and it has about 80K miles on it. There is no discernible reason for the transmission to fail on a car this new which has primarily been driven to and from work. A quick Google and social media search shows this is a pervasive problem with the 2021 Bronco Sport - many owners are experiencing electrical, power train and transmission issues. the federal safety agency needs to investigate this matter before someone is seriously injured or killed because of the failure of Ford in manufacturing the 2021 Bronco Sport.

Filed Apr 18, 2025 · Acceleration, Electrical · 30,000 miles · MD

The contact owns a 2021 Ford Bronco. The contact received notification of the federal safety agency Campaign number: 25V019000 (ELECTRICAL SYSTEM); however, the part to do the recall repair was not yet available. The contact stated that while driving at an undisclosed speed, the vehicle accelerated independently. The contact stated that after depressing the brake pedal several times, the vehicle was able to come to a stop. The message "Brakes Applied - Acceleration Reduced" was displayed. The contact had experienced the failure approximately 10 times. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The failure mileage was approximately 30,000. VIN tool confirms parts not available.

Filed Apr 9, 2025 · Acceleration, Electrical · NC

See attached document for complaint.

Filed Jun 26, 2024 · Acceleration, Fuel system · CA

Vehicle experienced power terrain failure causing vehicle to stop while driving in the middle of the road meanwhile cars avoid hitting my vehicle. I had my [XXX] old in the backseat at the time and this incident could have caused injury or possibly death. Vehicle has also experienced accelerator issues. Vehicle would lag 3-5 seconds for vehicle accelerator to speed up when pressing on accelerator. Fortunately no major accidents, but I am concerned that the issues I have experienced thus far with the Bronco 2021, it can potentially cause a major accident that can possibly cause injury or death. Through Ford Pass app I do recieve warning messages of mechanical issue at time of incident. Vehicle has been inspected and mechanical issues corrected at the dealership. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 23, 2024 · Acceleration, Electrical · AL

I bought my Bronco back in January this year (2024) and everything worked great. Then fast forward the end of May (2024) and my car when I got in it and crunk it up told me my MyKey had been activated. I said what is a MyKey never heard of it before in my life. I did some Google searches and tried to figure out. Once I figured it and couldn't get it off of there myself I took it to a Ford dealership. They told me the MyKey had to have the admin key and they would have to cut one etc and then the labor all together would be 400 dollars. I was floored how did this even happen? Who put the MyKey on here? It restricts the speed which you can go, only allows the radio so high, and you have to be buckled for the radio to play its crazy. So I call the dealership which I bought it from, Hendrick, my car was used and had about 39k miles on it. They don't know about MyKey either they sell used cars, but their main cars are Chrysler, Dodge, Jeep Ram. The used car guy said he would pay 200 for the key but not the labor that we had our car long enough it was time we took responsibility for it. Fast forward I reach out to Ford. The lady at Ford who said she was just a media specialist says oh just pay the money and keep the receipt. That if Ford does a recall in the future you will be reimbursed. I told her that this response was unsatisfactory as it creates a safety issue. I told her I was taking the car to Ford for recalls that needed to be fixed the next week and I would asked them how it got set. She didn't know how it got set either. The previous Ford dealership said he didn't know and that it could have been the previous owner but he couldn't confirm. So I went to the Ford dealership in Auburn this time to have the recall fixed and the lady at thr service center said yes the MyKey is only activated off the Ford app. My wife nor myself had the Ford app at the time this started which means the previous owner still had access to my key and set these limits. Google show more