2021 Ford Bronco Sport Powertrain & Transmission Problems

Transmission failed - vehicle completely lost power alternating with shuddering and full stopping without braking at slower speeds. Vehicle revved at very high RPMs at low speed, and struggled to shift. Sometimes, when shifted into reverse, vehicle would unexpectedly roll forward almost an entire car length. Transmission fully failed on freeway doing highway speeds of 75+ MPH. Full transmission failure has been confirmed by Ford dealer.

My 2021 ford bronco sport had a very dangerous issue on April 4th 2026. Nearly run over by a huge semi. Traveling at 70 miles per hour on I- 5 my vehicle had a sudden loss of power and wrench light went on, no prior signs. Semi traveling behind me nearly crashed into semi in the next lane as he slammed on his brakes and veered to the left to avoid running me over. Caused a big problem with the transmission .. Ford dealership now has car. Corning ford, Ca Unsafe to ever drive again with no remedy to fix this deadly problem. Recall 25s76 Powertrain control module. Third time this vehicle had a reset for this recall issue.

While driving, the vehicle stutters during acceleration, creating hesitation and inconsistent power delivery. This occurs during normal driving conditions and has not improved after being inspected by a dealership. The issue has been reproduced multiple times and remains unresolved. The vehicle was taken in for service, but no effective repair was provided, and the condition persists. There is an active recall related to a potential fuel injector defect, which may cause fuel to accumulate on top of the engine. The recall remedy is currently unavailable. Given the ongoing stuttering and known fuel system issue, there is concern this condition is related. This creates a safety risk, particularly when merging into traffic or accelerating from a stop, as the vehicle does not respond consistently. No warning lights have consistently appeared. The issue continues despite dealership involvement and lack of available recall repair.

We were told by the dealership that our 2021 Ford Bronco Sport with only 83,831 has a failed transmission and will need to be replaced.

The rpm will shoot up to 6 without movement. It doesn’t want to stop or go and it says park is unavailable. There have been many recalls on this vehicle, this is a premature failure and a huge safety concern the resulted in my car being undrivable.

On 2/19/26 the Vehicle would not go in reverse. This is the second time the vehicle has failed to reverse. The vehicle was towed and fixed by don chalmers ford the first time this happened. Now they stated the vehicle was one day past warranty and would not tow/fix issue. I dropped the vehicle at dc ford on Friday 2/20. Today they called and said they think it is the same issue that was fixed with the transmission and would charge 6-8 thousand to fix it. More if we wanted a new transmission. I have read several reports from other consumers that the ford 2021 bronco sport has transmission issues. This vehicle has also had several recalls that I have had fixed by ford. All maintenance has been performed by ford as well. This is an unsafe vehicle and ford has failed to insure its costumers are safe and treated fairly.

dragging, grinding, or rubbing noises from the rear of a 2021 Bronco Sport during low-speed turns are a known issue commonly associated with a faulty rear drive unit (RDU), often appearing around 40k-60k miles. This problem, sometimes described as a, shutter or chattering, is often tied to contaminated fluid caused by a defective or improperly designed vent hose that allows debris to enter the system.

I am experiencing pulsing and lunging while accelerating and cause loss of power and unsafe driving.

The contact owns a 2021 Ford Bronco Sport. The contact stated that while driving approximately 45 MPH, there was a loud scraping sound coming from the engine compartment, and the vehicle jerked abnormally. The vehicle was taken to an independent mechanic, and the failure was associated with the torque converter. The manufacturer was notified of the failure. The failure mileage was 91,000.

On December 13, 2025, we drove to Flagstaff, Arizona from Tucson, Arizona, where we live. As we came into town, the Bronco began to lurch and seemed to have difficulty shifting. I managed to make it to the Babbitt Ford service center’s parking lot, where it seized and died altogether. It stayed at Babbitt Ford where they worked on it until February 3, 2026. They replaced the transmission at great expense. On Feburary 3, we drove it home to Tucson. The next day, February 4, it died in the road twice, once in a major intersection. The first time it eventually resarted. The second time it died completely and required a special tow truck because we couldn't even get it into neutral to roll. It was towed to Holmes Tuttle Ford where they kept it for a week but were able to eventually restart it. They had it for 5 days, ran a diagnostic and reset the system. They drove it for over 80 miles and couldn’t recreate the problem. Then on February 25, I drove to Phoenix. While in Phoenix, it again inextricably had trouble shifting, died and wouldn’t start. I then had it towed to Camelback Ford. On March 6, Camelback Ford called and said they ran numerous tests and still can’t pinpoint the problem and the vehicle still won’t start or shift into neutral.

My car has been stalling at stops and I am unable to fill my car as it will not start so I have to put increments of 10-15.00 at a time they have told me now for over three months that parts were on back order and the recall that can catch my entire car on fire while driving cannot be fixed as their is no fix for it. Multiple issues continue to pile on when the vehicle isn’t even 5 years old

The main symptom is chatter/shudder during low speed turning events. This is due to a faulty rear differential unit. The problem has been confirmed by the dealer. No lamps or other warnings present prior to the failure. The manufacturer has issued multiple TSBs, latest being TSB 25 2351.

On or about 1/16/2025 I started to have issues battery would get display on the display screen it said to turn off ignition or draw Cato conserve battery and on the ford a] it said all or some options would be disabled to save battery and also the vehicle would shudder upon slow acceleration going forward straightforward I took it to the for inspection and they said it was OK. On 11/19 -2025

The contact's son owns a 2021 Ford Bronco Sport. While the contact's son was driving at an undisclosed speed, the driver heard an abnormal grinding sound coming from the rear differential. The check engine warning light was illuminated. The vehicle was taken to the dealer, where it was diagnosed with a failed vent tube and water intrusion. The contact was informed that the water intrusion damaged the clutch and gears. The contact was informed that the rear differential and vent tube needed to be replaced. The vehicle was being repaired. The manufacturer was made aware of the failure, and a case was filed. The contact was provided a discount on the cost of the part. In addition, the contact was informed that the failure was a known failure with the model vehicle; however, a recall had not been initiated. The failure mileage was approximately 81,421.

Powertrain and engine warning light illuminated 10/25 /25 first time Same problem again on 2/11/26 Same problem on 3/16/26 Same problem on 3/20/26 Three service stations can not fix problem : ford country nv Camelback, AZ Steve Coury Az

Vehicle is experiencing issues with shuttering from the rear differential and a 4wd fault code with vehicle just out of warranty. Rear differential speed sensor has failed and possibly need entire rear differential unit relaxed I’m told. Also water pump on engine has failed prematurely with ford avoiding responsibility

!!!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.

car is shuddering below 35 mph. The RPM gauge is bouncing. Had the transmission fluid drained and filled. Took it to our local repair shop and there are metal shavings in the transmission fluid.

At 70K automatic transmission stated to cause jerking motions while in lower speeds when starting to drive from lower speeds. Took car to dealership and i need a new transmission. I have read on Bronco Forum from other Bronco Sport BADLANDS edition, that their transmission has failed too at various mileage, ranging from 30K-66K. Of course this is dangerous if there is a complete failure of transmission. FORD's warranty on power train ends at 36K. The cost is $8700 to replace. transmissions don't die at 70K. according to car experts, transmissions should last 120K-200K. I can't believe there is a recall for some Bronco Sports and not ALL Bronco Sports.

The car would "skip" while driving. If paused at a light/stop sign, I would hit the gas and the RPMs would increase, but the car would not drive, then it would jerk and go. When driving, my foot would be at a consistent pressure on the gas, but the car would slow down as if I lifted by foot. Then the car would jerk and increase in speed again. There were no warning lights or messages at any of those moments. Due to concerning safety, I was driving to the shop to have it evaluated when I broke down at a stop light. 5 minutes before breaking down, the first light came on with a message in the Ford app stating "powertrain malfunction". When at a light, the automatic break kicked on and would not let me drive. When evaluated at the local dealership they said "there are multiple DTCs for internal transmission issues: DTC P0751/P2700 for a clutch mechanical fault, and P07E4 indicating the vehicle is unable to engage park. The A clutch is dragging, causing it to intermittently creep forward in neutral. The transmission will need to be replaced to correct the issue." The cost to replace it is $10,000+.