Mazda CX-90 lane assist problems

Filed Aug 5, 2026 · Driver assistance, Transmission · TX

ISSUE 1 – UNINTENDED DECELERATION (Power Train): While driving at highway speeds (60–80 mph) with foot off accelerator for approximately 5+ seconds while coasting, the vehicle unexpectedly executes a sharp, single downshift causing sudden unintended deceleration and an RPM spike. No warning lights illuminate. Documented on 11 occasions between May 20, 2026 and July 29, 2026; incidents occurred prior to May 2026 but were undocumented. Occurs most frequently decelerating off highway exit ramps but also during general highway coasting in Houston, TX. A passenger was present during multiple incidents. Trailing vehicles are not anticipating the sudden speed reduction, creating rear-end collision risk. ISSUE 2 – FALSE BLIND SPOT / REAR RADAR ALERTS (ADAS): The Blind Spot Monitoring and Rear Radar Sensor systems generate daily false alerts — both audible and visual — when no vehicles or objects are present. Triggers randomly across varying conditions. False alerts have caused multiple aborted lane changes that were otherwise safe to execute. ISSUE 3 – LANE KEEPING ASSISTANCE (ADAS): The LKA system applies forceful steering corrections during intentional, signal-indicated lane changes, including in areas without lane markings. Occurs at highway speeds during on/off-ramp transitions. Corrections have triggered reactive maneuvers by surrounding drivers in dense traffic, causing near-collision situations. Dealer service appointment scheduled August 6, 2026.

Filed Jun 29, 2026 · Driver assistance, Electrical · PA

Over my time owning this vehicle i have had several different safety concerns. although they have been resolved by the dealer, i have concerns for anyone purchasing this make and model. 1. lane departure. i have turned off lane detection because i have had the car try to auto correct and jerk me to the left into oncoming traffic 2. i have had incidents where the driver door was unable to be opened from inside. i had to roll down the window to open the door and get out 3. At a speed of 45mph, the vehicle suddenly went into limp mode. the car turned off and luckily i was able to pull over into a safe area. again i experienced the door locking from the inside. all issues and solutions have been documented at dealer services. these issues are of great concern and potentially could have been harmful or fatal. i no longer have trust in this model or company.

Filed May 27, 2026 · Steering · WA

I am reporting a persistent steering problem with my 2024 Mazda CX-90. While driving, especially when the highway bends to the left, the steering wheel feels like it sticks or partially locks at a certain left-turn position. When I try to return the steering wheel back toward center to continue straight, I have to apply extra force to overcome the resistance. Once it breaks free, the steering returns, but the sticking creates an unsafe delay and unexpected steering effort. The problem is persistent and has happened repeatedly, not just one time. It is most noticeable when coming out of a left curve. If I steer farther left, it may not bind the same way, but at a certain steering angle it catches or sticks. This creates a safety risk because the vehicle may not smoothly return to straight-ahead steering after a curve, especially at highway speed. The unexpected resistance could cause overcorrection, lane departure, or loss of control. There were no warning lights or dashboard messages before or during the issue. The vehicle has not been repaired for this issue. A Mazda dealer stated there are no open recalls for the vehicle, but the symptom appears similar to reported CX-90 sticky steering / increased steering effort complaints and the prior Mazda steering recall campaign involving the steering gear/worm gear assembly. The vehicle is available for inspection upon request. The failed or malfunctioning system appears to be the steering system, possibly the electric power steering rack or steering gear assembly.

Filed May 22, 2026 · Driver assistance, Steering · GA · crash

The vehicle started to hydroplane in rain on the highway and the lane keeping assist aggressively tried to push me back, which ended up causing us to hydroplane more and causing the vehicle to flip around backwards and we ended up sliding completely off the highway into a ditch totaling the vehicle.

Filed May 14, 2026 · Brakes, Driver assistance · KY

Hybrid battery failed causing electrical issues. - Fix in October 2024. During this time Service repair for the recall related to the power steering. Car became jerky and would lose the ability to hold turns. Took to mazda and told there was a gear housing need to be replaced. Was quoted at 4000 for the repair due to car having 49000. Mazda customer service stepped in and dropped the price in half. Eventually cover the majority of the cost as we reported this as a safety issue and it only camp up after the recall was performed for the power steering and the suspension was fixed. In the service report, Technician stated that the steering has fuse to the sway bar. I am now very concerned the sway bar is unsafe. Mazda did not comment on this when I ask. It appears as the fix one thing more continue to break. with The issues the lane assist continues to have issues seems to struggle with alignment issues. Car was with Mazda for 7 weeks during the 1st year of owning it. I am also concerned with some of the finding as I look at them with details pertaining to original purchase and miles being reported on our documents. Living in Kentucky the Lemon law does help with providing any sort of real action plans on CPO. Break have been squeaky causing uneven feedback. This issue has worsened over time. Car was purchased CPO - in April of 2025.

Filed May 6, 2026 · FL

I am reporting a persistent and dangerous "sticky steering" defect in my 2024 Mazda CX-90. While driving at various speeds, the steering wheel exhibits sudden, momentary resistance and physical binding, requiring increased manual force to overcome. In several instances, the vehicle veers into other lanes and, if not corrected, would enter into the median/other lanes of traffic. This vehicle has been to the dealership three times for this specific issue and has been out of service for a cumulative total of 36 days. Despite a "repair" attempt by the dealership, the nonconformity persists. The dealership initially attempted to attribute this mechanical binding to the Lane Keep Assist (LKA) system; however, I have personally conducted road tests with the LKA system fully disabled, and the physical "stickiness" remains present. I am aware of the federal safety agency’s 2026 Recall Query (RQ26) regarding the effectiveness of Mazda’s steering remedies for this model. Even though my vehicle does not fall under the recall for this issue, my vehicle is currently exhibiting the exact failure symptoms that the federal government is investigating as a potential safety risk. The sudden increase in steering effort is unpredictable and poses a significant risk of over-correction or loss of control, especially in highway traffic. During the most recent repair attempt by the dealership, they were unable to duplicate the issue; however, it is very prominent and concerning. There is no warning of when it will occur. If the vehicle veers over the line on either the right or left, the lane keep assist (LKA) will engage to correct the vehicle. In some instances, the resistance is too strong for the LKA to correct the vehicle, and it requires driver correction.

Filed Apr 16, 2026 · Steering · NJ

I am writing to formally report a serious safety defect regarding the steering system of my 2024 Mazda CX-90. While driving at various speeds, the steering wheel frequently exhibits a "sticking" or "binding" sensation. In several instances, the steering wheel has become momentarily stuck in a fixed position, requiring significant physical force to "break it loose" and regain control of the vehicle's direction. Safety Risk: This condition is unpredictable and creates a hazardous driving environment. The sudden resistance and the excessive effort needed to maneuver the vehicle pose a high risk of over-correction, which could lead to a lane departure or a collision. This mechanical failure compromises the fundamental ability to steer the vehicle safely. Request: I am submitting this report to ensure this issue is documented for safety investigations and to urge a review of potential defects in the steering rack or electronic power steering (EPS) calibration for this model.

Filed Apr 1, 2026 · Driver assistance, Steering · SC

Sticky steering overactive lane assist

Filed Mar 23, 2026 · Driver assistance · PA

At highway speeds, even with lane keeping assist disabled/turned off, if the ADAS is turned on LKA seems to remain active. Steering effort is unpredictable making it difficult to maintain a line through the corner. Effort will suddenly decrease resulting in oversteer. This is particularly dangerous when next to other cars, guardrails, barriers and the like. The behavior is greatly reduced with all ADAS off. This is largely repeatable over the last 18 mos/24,000 miles.

Filed Mar 23, 2026 · Steering · 100 miles · MI

The contact owns a 2026 Mazda CX-90. The contact stated that while driving at undisclosed speeds, the steering wheel was pulling to the left, causing the vehicle to merge into the left lane unintendedly. The contact firmly held the steering wheel to prevent the failure. Additionally, the vehicle jerked to the right lane while the lane keep steering assist function was activated because the steering wheel was pulling to the left. No warning light was illuminated. The vehicle was taken to the dealer, but no cause of failure was found. The failure persisted, and the vehicle was taken back to the dealer, and an alignment of 0.1 degrees was performed; however, the failure recurred. The vehicle was taken back to the dealer for the third time, and the contact was informed that no repair was available and was advised to contact the manufacturer for assistance. The vehicle was not repaired. The manufacturer was made aware of the failure, and a case was filed. The failure mileage was approximately 100.