Subaru Ascent shudder problems

Filed Jun 3, 2026 · Electrical, Engine · MD

31 May 2026 (AM) Operating vehicle north on MD Rte 147 traveling appr. 45 MPH when vehicle started experiencing uncontrolled electrical activation of features e.g., heat, air, radio, main display. This proceed a shuddering in the drive train like one would experience with a transmission issue. Then, without warning, while at full speed, there was a complete loss of engine power i.e., it turned off, which also resulted in loss of steering and breaking resulting in a complete loss of control of the vehicle. As the vehicle drifted to a rolling stop, the main display indicated to turn off the vehicle and it was forced into park to stop it and then the ignition control button was pushed. The car was restarted and moved off the road. Subsequent restarts and terminations occurred without issue. No fault code was generated or captured by the vehicle computer and the dealer could not reproduce the problem.

Filed May 28, 2026 · Engine, Transmission · KY

While pulling up to a drive thru window the vehicle shuddered and the engine shut off. I lost all power steering and had to come to a stop, shift into park, then restart the engine. No check engine lights or warnings illuminated. There were no status messages to indicate what caused it to shut off. Also the driver side mirror shakes a lot, just like all the other reports say.

Filed May 10, 2026 · Transmission · KY

On 9-May, 2026, the vehicle was driven during the morning with no warning lights or indication of component failure. Vehicle was parked on the owner's driveway at approximately 13:00. Approximately 15:40 I started the Ascent’s engine, let it idle for about 60 seconds, buckled up and scanned dashboard and rearview mirror. No warning lights or any fault indication. Approximately 15:42, I put the vehicle in reverse and released the brake Approximately 15:42:30 the vehicle exited the driveway Approximately 15:43 there was a shudder on [XXX] (heading north); the dash lit up with multiple warning lights; the check engine warning illuminated and the ATOIL Temp warning light engaged. At this time, the vehicle rolled down a hill, un-commanded, and only with repeated pumping of the brake did the vehicle stop. Approximately 15:49 I was able to park the vehicle, engaging the hazard flashers and exited the vehicle. While no one was injured in this instance, had this happened on a highway there would have been insurance losses and potential injuries. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jul 20, 2025 · Transmission · IL

While driving on the highway, my vehicle suddenly lost the ability to accelerate—this is the second time this has happened, with the first incident occurring in June 2022. Each time I bring the car to the dealership, I’m told that because the issue cannot be recreated on the spot, despite codes that are warranted for the QMR to be done they’re unable to inspect or apply the WRK-21 procedure to replace the transmission under warranty. Despite this, my car consistently slips during normal driving conditions. It shudders and surges unpredictably while accelerating in traffic, creating an extremely unsafe situation. Most recently, I was driving with my children when the car failed to accelerate as I attempted to merge across four lanes of highway traffic. I had to coast until I could safely pull over. On other occasions, the vehicle has jolted forward unexpectedly, nearly causing collisions and forcing me to slam on the brakes. This issue is not only recurring—it is dangerous. I am requesting that it be taken seriously and addressed appropriately under warranty.

Filed Mar 30, 2025 · Transmission · VA

When trying to maintain highway speeds (65 to 70 MPH) and driving in mountainous terrain of Pennsylvania, Maryland, or New York, the vehicle will shudder as if it is loosing power. The vehicle will rapidly loose speed. No warning code is issued. The only way to solve issue is depress the pedal to increase the RPMs. Took vehicle to dealer and reported that it felt as if the CVT chain was slipping. They said they could not recreate and there was no code.

Filed Sep 30, 2024 · Transmission · AR

At approximately 10000 miles the drive train (transmission) developed a shuddering while driving. This occurs at any speed but more frequently at 45-60 MPH. The frequency of this problem has increased with the vehicle which now has 45202 miles. It is now occurring periodically at acceleration from a complete stop. The problem has been reported to the dealer at every service. It was evaluated by the service department for a 4-day period in which they could not duplicate the problem. However, they only drove the vehicle 20.2 miles during this evaluation. It is unknown if this may lead to a safety issue, but it produces a very uncomfortable driving experience and distraction while driving. There is no warning lamp associated with this problem at this time.

Filed Sep 25, 2024 · Brakes · GA

Brakes shudder and fade when slowing down from highway speeds. Subaru has issued many "fixes" but it keeps happening. See most recent "Ascent Front Brake Warranty Extension Coverage" it still has not fixed the problem!

Filed Dec 28, 2023 · Transmission · NC

I was sitting in a long line of stopped cars. I looked in my mirrors to move to the right lane. I made sure no vehicles were coming. I pressed on the accelerator to move, and nothing happened. In a panic I quickly repeated pressing the accelerator and nothing happened. The third time the car finally moved forward. I was terrified that someone would come along quickly in the right lane a hit my car. I also had a passenger that was speechless about the incident. Now I feel unsafe to drive the car. This has happened one time previously, but I thought it was a fluke. Also, like many other comments the transmission shudders sometimes but not often. I waited to buy a new 2022 Ascent Limited because I read where the transmission issue had been fixed. Mentioned it to the service advisor and he laughed it off.

Filed Dec 6, 2023 · Transmission · NC

CVT transmission skips in high gear and shudders randomly while driving down the road. Randy Marion in Hickory NC is where we purchased and replaced the rear transfer clutch and insists the problem has been corrected. It is not. Our regular mechanic and Moderna Subaru of Boone NC both agree the transmission is bad. It has been sitting at the dealership for 2 months while all parties argue over who is responsible for repair. (Original selling dealership, Subaru of America, 3rd party warranty) meanwhile I have no car but am expected to make payments. There are no warning lights or indicatator lamps to show an issue which is even more scary. I do not feel safe driving the vehicle without repair as the stutter and slipping between gears can cause hesitation that could cause an accident or worse. We did not test drive the vehicle at high gear and that was our mistake, but I drove it on a trip 2 days after purchasing and it had transmission issues the entire time. Dropped back off at dealership Monday morning and have been dealing with headaches since then.

Filed Aug 29, 2023 · Transmission · WA

CVT issues. Shuddering of transmission (acts like it's slipping), either on slight incline or even flat road. Delayed acceleration when needed, feels unsafe if I ever need to avoid a situation by accelerating. At least 2 occurrences when car shut off due to transmission lurching (while driving). This issue has been happening from purchase. The head unit continues to buzz, freeze, and reset itself during carplay (known issue with the software). Have been told an update is coming, but it never does. The concern is navigation disappearing when driving and not returning, making it unsafe to operate vehicle and phone at the same time. This issue has been happening from purchase.