Subaru Legacy adaptive cruise problems

Filed Oct 22, 2024 · Driver assistance, Electrical · OH

My Subaru ran perfectly fine until the water pump and cooler lines got replaced after these were replaced it was tried to be driven and the car then had no idea what gear it was in drive is drive neautral is drive and reverse does not work at all paddle shifters won’t work AT oil temp light check engine light brake light flashing cruise control light all came on and the car will only go forward and it’s making some crazy shutter noises when you start it and sometimes it shuts off after it was started.

Filed Dec 20, 2023 · MN

We recently purchased a used 2020 Subaru Legacy sedan with ~33,000 miles on it. It has a salvage title due to previous owner hitting a deer, (no air bag deployed, just minor body work) and it was professionally repaired to "like-new" condition. Last weekend, when starting the car, the check engine light and a bunch of other warning lights came on. An OBDI scan showed a code of "P263A" indicating a problem with the Thermo Control Valve. As a result of the defective TCV, several major functions of the vehicle were automatically disabled: adaptive cruise control, eyesight system with lane keeping, automatic braking, as well as all cabin heating, windshield defrost function, and the engine temperature gauge. Without these systems properly working, the drivability of the vehicle is greatly impaired, especially in a Minnesota winter without a functional windshield defrost and engine temperature monitoring gauge. When taking the car into the local Subaru dealership for full diagnostics, they confirmed that indeed the TCV was bad, and quoted me a cost of $1135 to replace it. They claimed that since the car has a salvage title, Subaru's warranty will not cover any part of this repair. However, there is a known wide-spread failure of this Thermo Control Valve in the 2019-2021 cars as listed in Subaru Technical Bulletin [XXX] which clearly states that there is a redesigned TCV that replaces the defective earlier part and fixes the earlier design flaws of the one installed in 2019-2021 vehicles. I spoke with the Subaru of America Client Advocacy representative, and he was adamant that the salvage title negates any responsibility for Subaru to fix this know defectively designed Thermo Control Valve. My thinking is that the defective TCV is both a drivability and a safety issue, and due to the wide-spread early life failure of this part, Subaru should be compelled by a recall to replace the defective car in all customer cars. All ADAS is affected by a bad TCV. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORM

Filed May 6, 2023 · Driver assistance · WI

Center console/head unit will regularly lock up and eventually reboot when Apple CarPlay is in use, cruise control, lane keep will turn off, and car will warn that ADAS is not available, backup camera does not work during this time. HVAC controls are not accessible during this time as well

Filed Feb 25, 2023 · Engine, Transmission · NY

Check engine light came on at 55,500 miles on exactly the third anniversary of purchase. Local mechanic determined the code related to Thermo Control Valve failure. Apparently an ongoing issue with many Subarus since replacing the thermostat with this in their cars. Lost all eyesight features, including cruise control and high beams, as well as cabin heat in the midst of winter in the northeast. A simple google search reveals MANY instances of this subpar part falling on Subaru cars. $1,066 later, I feel a recall or coverage under powertrain warranty is warranted.

Filed Sep 20, 2022 · Acceleration · NV

While driving, cruise control and check engine light comes on and then the car won't accelerate. Engine revs really high and when pushing accelerator pedal, car will not move. The check engine code states "throttle position sensor". This has happened more than 20 times

Filed Apr 27, 2022 · Driver assistance · IN

On average about twice per month, the touch screen will lock up. This causes the entire system to crash turning off cruise control, emergency braking, lane departure, lane keep assist, and almost every other "smart" function of the vehicle. There is no specific action that causes this, it is purely random. The "lock-up" can last anywhere from 30 seconds to several minutes. The dash notifications telling you that all of the assistance features have turned off don't come on until the system has rebooted, even though they stopped functioning at the same time the "lock-up" started. On a typical day, there is a significant delay in controlling these features via the touch screen. Minor issues where the assistance features are delayed by several seconds have happened often, but this does not result in a complete system reboot. The best way I can describe it is as if the vehicle is controlled by a computer running Windows Vista with so many viruses it can barely function. Even just adjusting the electric seats or stereo volume can have up to a 30-second delay from user input to the system response. I have noticed that during these delays, the assistance features (like lane keep and collision warning) are also delayed.

Filed Mar 25, 2022 · Electrical, Engine · 115,000 miles · VA

The contact owns a 2010 Subaru Legacy. The contact stated while driving at 50 MPH, the emergency brake warning light, traction control, oil pressure warning light, and the cruise control warning light illuminated. The contact veered to the side of the road. The vehicle was towed to the contact's residence. The vehicle was then towed to an unknown dealer where it was diagnosed that the transmission valve body had failed. The vehicle was repaired; however, the failure reoccurred a week later. The vehicle was taken back to the dealer where it was diagnosed with an unknown electrical failure. The vehicle was repaired; however, the failure reoccurred less than a week later. The vehicle was taken back to the same dealer who advised the contact to turn off the vehicle, disconnect the battery for 5 minutes, and to then restart the vehicle. The contact followed the instructions however, the failure persisted and the check engine warning light illuminated. The vehicle was taken to an independent mechanic where the gas cap was replaced; however, the failure reoccurred. The vehicle was not repaired. The manufacturer was notified of the failure but did not provide any assistance. The failure mileage was approximately 115,000.

Filed Feb 13, 2022 · Driver assistance, Electrical · TX

I am the original owner of the vehicle in question. I have been experiencing excessive electrical drain issues throughout the life of my vehicle. I have had to jump it at least 10 times and have replaced the battery 4 times throughout my 7 years of ownership. This is quite excessive and has caused safety issues in the past as you never know when the battery suddenly no longer has enough power to start the vehicle. My fiancé was recently on a ferry and upon landing the vehicle would not start and this caused quite an issue with the ferry operator and resulted in undue stress and anxiety on her. I have also always had an issue with the Adaptive Cruise Control system (EyeSight) in which under what I believe are specific circumstances, the system fails to detect the roadway and road markers in front of the vehicle and abruptly shuts off. This hasn't been a major issue as I am still actively driving the vehicle, but when you are driving 50mph on a highway and suddenly you are decelerating without brake lights indicating so to others around you can cause a sense of alarm. The somewhat specific situations this occurs in is when there is very little to no ambient light on the road. Although my headlights are on, they don't seem to provide enough light for the system to 'see' at all times.

Filed Nov 30, 2021 · Acceleration, Driver assistance · PA

This vehicle is equipped with the Subaru "Eyesight" system which is a number of safety features like automatic cruise control, lane keep assist, and others. About once a week on average while driving the entire system will shut down and the screen will go dark. You lose the radio, bluetooth, navigation, and all the Eyesight systems. After about 30 seconds it will reboot and things will come back online but this is a major safety issue because you loose systems that help with safety. The dealership said it's a known software issue and there's nothing they can do until an update is available. I called Subaru USA customer support in September and they said an update would be available by the end of October and nothing was released. I called in early November and they said they were still working on it but had no release date.

Filed Jun 12, 2021 · Driver assistance, Electrical · RI

1. The infotainment system crashed (happens often), which caused the touchscreen in the center control stack to turn black and become unresponsive. This also caused the EyeSight safety system, adaptive cruise control (with lane keep assist), and reverse auto braking to all shut down (my dashboard lit up with warning lights and errors). 2. Not only is this an annoyance, but having all of the safety systems in my car unexpectedly shut down is extremely unsafe, especially adaptive cruise control. Other functions of my car, such as the radio and climate controls are also inaccessible when this happens. 3. A Subaru dealer has replaced the touchscreen in my vehicle to try and remedy the slowness and crashing, but it did not seem to fix anything. My car safety systems have not shut down prior to this incident, but on this day (June 6th), they did when the system crashed, which was after the replacement. After waiting weeks to get a replacement which didn't fix anything, I felt as if I needed to go elsewhere for help with this issue. 4. Only the manufacturer has inspected this issue, and I've also emailed Subaru directly after this incident, as to which I have not gotten a response yet (emailed on Monday, June 7th). 5. The warning lamps (for EyeSight, reverse auto breaking, and adaptive cruise control) all appeared on my dashboard as soon as the infotainment system crashed on June 6th. Prior to this, my vehicle had no warning lamps. They went away a few minutes after the system rebooted (all while I was driving on the highway), and system functionality returned to normal. Other Notes: This vehicle only has about 15k miles on it, and is only 1 year and 3 months old. Issues like this should not be happening. Before the replacement of the touchscreen, I had issues with it being extremely laggy and crashing, but my car's safety systems never shut down before. This is a new issue, which prompted me to report it to the federal safety agency.