Ford Bronco Sport shudder problems

Filed Nov 3, 2026 · Brakes · MT

While driving, an severe and persistent rear brake resonance defect occurs during braking operations. The defect manifests as high-frequency vibration, loud grinding, and low-speed brake shudder/chatter from the rear braking system, impacting vehicle control and braking predictability under normal driving conditions. The affected component is the complete rear brake assembly, which is currently installed on the vehicle and available for inspection upon request. Safety is compromised due to diminished braking feel, driver distraction, severe auditory and tactile resonance during deceleration, and unpredictable pedal performance during low-speed maneuvers and stopping intervals. The defect has been repeatedly reproduced and formally confirmed by an authorized dealership service center over multiple repair attempts. Servicing included the execution of Technical Service Bulletin TSB 25-2438, which failed to remedy the issue. The issue was formally escalated to and evaluated by the vehicle manufacturer. The manufacturer’s Global Technical Assistance Center (GTAC) evaluated the vehicle and documented in writing that no further technical or engineering procedure exists to resolve or cure the recurring rear brake resonance. Symptoms first appeared during normal operation at approximately 17,000 miles, presenting as severe rear brake grinding and resonance without prior dashboard warning lamps or system error messages. The hardware defect remains active and unrectified.

Filed Oct 26, 2026 · Fuel system, Transmission · OH

The contact owns a 2021 Ford Bronco Sport equipped with an 8F35 automatic transmission. While driving between 25 and 45 MPH under normal acceleration, the vehicle experienced repeated violent hesitation, jerking, and lunging 4 to 5 times in rapid succession, accompanied by rapid RPM fluctuations between 2,000 and 3,000 RPM. The condition mimics an engine misfire or momentary stall and loss of motive power during acceleration, creating an immediate safety hazard and risk of rear-end collision in active traffic. The vehicle was taken to an authorized Ford dealership (Cronin Ford North) on September 30, 2026. The dealership verified and duplicated the complaint on a road test, monitored PIDs, and officially confirmed that the torque converter clutch (TCC) was slipping. Despite confirming mechanical slip, the dealership stated in writing that there were "no relevant articles," overlooking the published Ford Special Service Message SSM 54797 for 8F35 torque converter shudder below 60 MPH. The dealership recommended replacing the torque converter and main control valve body for over $5,200. When the owner declined due to cost, the vehicle was released back into service without answering the owner's written safety inquiry regarding whether the vehicle was safe to operate with verified drivetrain slippage. Additionally, the vehicle has an open safety recall (25S76) for which Ford corporate confirmed no remedy or parts are currently available. The vehicle has not stalled completely, but the severe hesitation and surging persist under normal acceleration. The manufacturer has not provided a resolution.

Filed Oct 15, 2026 · Transmission · WV

The rear drive unit (RDU) deteriorated at 78k miles. I began to notice a shudder during low-speed turns with high steering angle. Upon inspection, metallic flakes were discovered in the RDU’s fluid, apparently indicating mechanical degradation of the internal clutch packs. Two separate Ford dealerships recommended complete RDU assembly replacement at a significant expense. I am concerned that an important drivetrain component could deteriorate this quickly, from normal driving use. I believe this could result in wheel drag/lockup or seizure while operating the vehicle. I have not experienced it yet and I’m not sure whether a total mechanical failure would cause it either. Ford has numerous technical service bulletins on this issue, so it is known to them (TSB 26-2328). I am currently waiting for a dealership to receive parts so that the RDU may be replaced.

Filed Oct 3, 2026 · Steering, Transmission · MO

The rear drive unit (RDU) is the suspected culprit for a harsh rubbing sound which occurs during turns at low speed, typically 20mph or less. Safety is a concern because the manufacturer has identified several issues with this year/model and its RDU, and the concern is contaminated lubricants can cause unseen damage leading to the potential loss of motive power or uneven power distribution. I was lucky to have found the problem before it became significantly worse. Ford has acknowledged the issue in at least three service bulletins I was able to find. No warning lamps or messages, but the shudder started around 40-50k miles.

Filed Sep 28, 2026 · Transmission · IN

At around 75,000 miles, we noticed a small, occasional transmission shudder. We were told that these vehicles feel like that sometimes. We brought it up again around 100,000 miles. We were told we needed to change the purge valve assembly. We did. It did not help. We took the vehicle to a transmission shop and were told that the torque converter was slipping, and that the transmission needed rebuilt or replaced. We took it back to Ford to confirm. They quoted us for a rebuild. I have seen many other people online with the same issue. Some happening, luckily (I suppose), while still under warranty. These transmissions are failing and no one is doing anything. I now have a transmission repair on a vehicle with only 120,000 miles on it that is going to cost me almost as much as the vehicle is worth. This could be a safety issue if the transmission were to fail in Chicago traffic, or when merging into traffic.

Filed Aug 25, 2026 · Transmission · NY

I am experiencing severe drivetrain binding and violent shuddering/chatter from the Rear Drive Unit (RDU) during low-speed turns in both directions. The vehicle hesitates and can stop violently on its own while turning. When the vehicle is parked and shut off, it also violently jerks backward, indicating the RDU is binding and storing mechanical tension. This is a significant safety hazard. The symptoms match the current Ford Technical Service Bulletin TSB 26-2328 (Chatter/Shudder During Low Speed Turning Events), which supersedes earlier bulletins including 26-2194 and 25-2351. I first reported the RDU issue along with a rear brake noise at the dealership and provided the relevant TSB numbers. The dealership stated the RDU was fine, performed only the brake TSB, and attributed the shudder to the brakes. After the vehicle was released, the RDU symptoms returned approximately 100 times worse within two days. On the return visit the dealership said they could not reproduce the concern and initially documented it as “just a noise.” I have repeatedly asked Ford (case management and Business Operations) whether the vehicle is considered safe to drive or sell in its current condition. I have not received a clear written answer. The original dealership has also refused to give a direct safety answer. I am requesting that this safety-related RDU condition be properly investigated and repaired.

Filed Aug 3, 2026 · Fuel system · 15,000 miles · MI

The contact owns a 2024 Ford Bronco Sport. The contact stated that while driving approximately 30-60 MPH, the accelerator pedal was depressed; however, the vehicle shuddered and stalled. No warning lights were illuminated. The vehicle was taken to a dealer to be diagnosed; however, the cause of the failure was not yet determined. The vehicle was not repaired. The contact received notification of the federal safety agency Campaign Number: 25V467000 (Fuel System, Gasoline); however, the part to do the recall repair was not yet available. The local dealer was contacted. 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 15,000.

Filed Jul 24, 2026 · Transmission · VA

What component or system failed or malfunctioned, and is it available for inspection upon request? The vehicle’s drivetrain or all-wheel-drive system appears to be malfunctioning. During turns, the vehicle runs rough, feels as though it is binding or shuddering, and becomes harder to accelerate. The exact failed component has not yet been diagnosed. The vehicle is available for inspection upon request, and I have a service appointment scheduled in approximately two weeks. How was your safety or the safety of others put at risk? The reduced acceleration and rough operation while turning make the vehicle respond unpredictably. This could prevent me from accelerating safely through an intersection, entering traffic, or avoiding another vehicle or hazard. Has the problem been reproduced or confirmed by a dealer or independent service center? No. The problem has not yet been reproduced or confirmed by a dealer or independent service center. I have an appointment scheduled in approximately two weeks for inspection and diagnosis. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No. The vehicle and suspected component have not yet been inspected by the manufacturer, police, insurance representatives, or others. An inspection appointment is scheduled in approximately two weeks. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No warning lamps or dashboard messages appeared. The symptoms consisted of rough running, shuddering or binding while turning, and reduced acceleration. The symptoms first appeared recently when the vehicle had approximately 48,000 miles.

Filed Jun 16, 2026 · Transmission · FL

The rearend is making a shuddering on tight turns . Vehicle only has 24,700 miles on it. Unknown if oil is low in differential oil or if vent hose is plugged. May be contaminated oil in differential.

Filed Jun 12, 2026 · Electrical, Fuel system · IL

The vehicle is experiencing powertrain performance issues, including a persistent stutter, vehicle shuddering, and erratic RPM jumping while driving at 45-55 mph. These symptoms began immediately following the latest software flash in January 2026 and have progressively gotten worse. An Independent mechanic and a transmission specialist have inspected the vehicle and are unable to resolve the issue because no diagnostic trouble codes are being generated. There is a safety and engineering concern that the continuous reprogramming of the PCM & BCM has altered the vehicle’s operations outside of its initial factory design parameters. The vehicle has suffered an immediate drop in performance and fuel economy. In June 2026, I received another notification about Recall 25S76, not being completed yet by Sam Leman Ford. After several attempts to reach someone, I called an authorized secondary Ford dealership, Heller in Bloomington, who pulled the VIN data and stated they could not verify if the 25S76 recall was properly completed by the original servicing dealer. It seems as if there is a tracking failure on the manufacturer's side. While she stated there were notes by a service tech for mobile repair, the fact that I got another notification about the same recall’s intermediate repair not being completed, that signified to her it may not have been. Heller Ford stated the only way to know, is to attempt a 4th PCM reprogramming. If the manufacturer rejects the warranty reimbursement, the cost of the diagnostic labor hours will be billed to me. Consumers should not be held financially responsible for verifying faulty manufacturer documentation, nor should software patches be used as a substitute for replacing a physically defective, fire-prone component. By allowing the manufacturer to alter the vehicle's electrical and powertrain architecture rather than mandating a hardware replacement, consumers are left driving vehicles with degraded performance and an active hazards.