2025 Tesla Model Y: adaptive cruise control problems

Filed Jul 24, 2026 · Driver assistance · KY

My 2025 Model Y with stalks creates an unsafe driving condition. Under current software, enabling FSD forces a single-pull lockout that completely disables standard Traffic-Aware Cruise Control (TACC). (Advanced Driver Assistance Sytems) FSD routinely follows vehicles at less than a 1 second gap at 70-80 MPH and attempts unsafe merges with tractor-trailers. Drivers must be allowed to drop to TACC to maintain safe following distances without being forced to entirely disable FSD while parked. Because the software removes the single-pull/double-pull distinction, the driver cannot downgrade the system to standard cruise control on the fly to establish a safe following distance. To stop the dangerous FSD behavior, the driver must completely disengage the system to manual control, as switching the underlying autopilot modes requires pulling over and shifting into Park. Tesla customer support has refused to address this software-enforced safety hazard. Following too closely routinely happens on the interstate at Highway speeds while using FSD. This safety issue occurs consistently during highway driving on major interstates at speeds between 70-80. The inability to seamlessly select a safe cruise control mode increases the risk of a high speed rear end collision.

Filed Jan 26, 2026 · Driver assistance, Electrical · FL

All safety and most computer related features in the vehicle have failed. Cruise control, backup cameras, all other cameras, the navigation (assuming this is also impacting the projection of remaining battery life as my car always thinks it is at my home), warning signals for approaching obstacles/dangers, cruise control of any kind does now work, lane departure warning has failed, and automatic windshield wipers do not work. This happened without warning and was not related to an update. On January 13, 2026, the car worked in the morning and then all of these issues started happening. I made a Tesla service appointment, but they are not able to see me until February 3, 2026.

Filed Jan 15, 2026 · Acceleration, Driver assistance · TX

Tesla Supervised Self Driving (FSSD) update 14 removed the ability for the vehicle operator to set speed targets. Additionally, their system is unable to accurately determine speed limits for many roadways. The discrepancy between FSSDs perceived speed limit and actual speed limit can be as much at +/- 25mph. The discrepancy can occur suddenly and at any time during a drive, even on stretches of road with a consistent speed limit. This results in moments of dangerous acceleration and/or deceleration that is not requested by the vehicle operator or can be reasonably anticipated. This causes erratic driving behavior to both the Tesla and to other motorist in the vicinity. Erratic, unpredictable driving is a major cause of traffic accidents that can lead to serious damage, injury, or death. Prior versions allowed the operator to set a speed target, similar to standard cruise control, that the vehicle attempted to maintain and would not exceed. FSSD v14 does not allow the vehicle operator to have any control over the speed of the vehicle to any degree that meaningfully contributes towards safe, legal driving.

Filed Aug 15, 2025 · Driver assistance · AZ

I have had multiple incidents of "Curvature Assist Active" message appearing on screen while on Cruise Control. It suddenly reduces the speed of the car. This happens on a straight road with no curves or slope. It also happens at random. On the same stretch of road at the same time of the day, this issue pops up sometimes and doesn't on other times. Every time this comes up, the car reduces speed suddenly. For example, I go from 45 mph to 23 mph in a few moments. If there is a lot of traffic behind me and the car behind me was not expecting such a sudden decrease in speed as there is no obstruction in front of me, this could lead to a safety issue. I took the car in for repair. The technicians could not find out what the issue was. They said they recalibrated the sensors and test drove and did not see this occur. As this is occurring randomly it might not have shown up when they test drove. But, it happened to me when I took the car back and it keeps happening randomly at least twice a day. There is no specific location and/or time of the day. Tesla doesn't provide an option to disable this "Curvature Assist" feature for something so basic as Cruise Control. Along with this I have had 2 incidents where my car applied brakes suddenly when there was no obstruction in front of me. In both incidents, I had to immediately take over and speed up to avoid any issue with traffic behind me. If there is any safety incident due to these issues, Tesla will have to be held liable.

Filed Mar 15, 2025 · Brakes, Driver assistance · FL

This car is three months old. Driving near my home on a four-lane divided road with 55MPH speed limit. While having either cruise or auto-steer enabled and using cruise control only, experiencing ongoing instances—during every drive—of unexpected and unexplained hard, sudden braking, reducing vehicle speed dramatically (multiples of 10MPH in less than five seconds). Each time, there has been very light traffic, and there is nothing I can see on the road that could explain the reason for the braking, hence the unexpected nature. The problem could easily cause a rear-end collision soon if another car is following closely, and I’m not able to correct and accelerate fast enough. Vehicle is very clean all around, including camera locations, and the weather is perfectly sunny and temperate each day. I do not recall this event happening while driving at night in my semi-rural area. I have not yet reported the problem to Tesla, so they have not inspected or attempted service on the vehicle.

Filed Jan 6, 2025 · Driver assistance, Visibility · NJ

Vehicle Information: • Make: Tesla • Model: Model Y • Year: 2025 Description of the Problem: After a software update pushed by Tesla, the AP4 computer in my 2024 Tesla Model Y shorted out, causing a complete failure of all systems controlled by this computer. The following safety-critical and driver-assist features have become non-functional: Cruise Control (adaptive or otherwise) Forward Collision Warning Lane Departure Warning Lane Keeping Assistance Blind Spot Warning Parking Collision Warning Full Self-Driving and Auto Park features Cameras required for Autopilot functionality Additionally, because the GPS system has failed, the vehicle’s Navigation system is inoperable. This impacts Tesla’s unique route planning feature that sets up Supercharger stops during long journeys. Without a functioning navigation system, I cannot properly plan my travel or locate charging stations, which severely affects the usability of the vehicle. Safety Concerns: The failure of these systems, especially safety features like forward collision warning, lane keeping assistance, and blind spot monitoring, puts both the driver and others on the road at risk. Losing access to safety-critical functions after an update is unacceptable and poses a serious danger to vehicle occupants and surrounding traffic. Incident Details: • The issue occurred immediately following a software update. • Tesla pushed the update remotely without providing any warning or indication of potential risks. • The failure appears to be related to a hardware short in the AP4 computer, directly caused or exacerbated by the update. Desired Outcome: • A thorough investigation into Tesla’s software update process and its effect on vehicle hardware and safety systems. • A resolution that prevents similar failures in other vehicles and ensures system updates do not compromise vehicle safety or critical functionality.

Filed Dec 18, 2024 · Driver assistance, Electrical · IN

Tesla has told me the AP4 computer has failed in my car which has resulted in them having to replace it. I had this issue start right around December 7, 2024. I scheduled the soonest appointment available for December 24, 2024 however Tesla contacted me and moved my appointment because they stated that the part was unavailable at this time and should be delivered by January 24, 2025. Not offering me a rental or anything on my brand new 2025 Tesla. It has just under 1,000 miles on it and have the car since November 8, 2024. This issue impacts: emergency braking, blind spot detection, lane keep/centering, assisting with parking, automatic high beams and wipers, cruise control/ adaptive cruise control, Vehicles built in GPS to be stuck at one location every time, has made my touchscreen not automatically brighten or dim, my auto dimming mirrors be too dim in most driving conditions, constantly fail to install system improvements and safety updates, and because my vehicle keeps trying to do this, it has caused increased battery drain as well. This has increased the safety risk of my vehicle tremendously. Tesla has not seemed to publicly acknowledge the issue yet either.

Filed Dec 18, 2024 · Driver assistance · NJ

Here is my draft: Vehicle Information: • Make: Tesla • Model: Model Y • Year: 2025 Description of the Problem: After a software update pushed by Tesla, the AP4 computer in my 2024 Tesla Model Y shorted out, causing a complete failure of all systems controlled by this computer. The following safety-critical and driver-assist features have become non-functional: 1.⁠Cruise Control (adaptive or otherwise) 2.⁠Forward Collision Warning 3.⁠Lane Departure Warning 4.⁠Lane Keeping Assistance 5.⁠Blind Spot Warning 6.⁠Parking Collision Warning 7.⁠Full Self-Driving and Auto Park features 8.⁠Cameras required for Autopilot functionality Additionally, because the GPS system has failed, the vehicle’s Navigation system is inoperable. This impacts Tesla’s unique route planning feature that sets up Supercharger stops during long journeys. Without a functioning navigation system, I cannot properly plan my travel or locate charging stations, which severely affects the usability of the vehicle. Safety Concerns: The failure of these systems, especially safety features like forward collision warning, lane keeping assistance, and blind spot monitoring, puts both the driver and others on the road at risk. Losing access to safety-critical functions after an update is unacceptable and poses a serious danger to vehicle occupants and surrounding traffic. Incident Details: • The issue occurred immediately following a software update. • Tesla pushed the update remotely without providing any warning or indication of potential risks. • The failure appears to be related to a hardware short in the AP4 computer, directly caused or exacerbated by the update. Desired Outcome: • A thorough investigation into Tesla’s software update process and its effect on vehicle hardware and safety systems. • A resolution that prevents similar failures in other vehicles and ensures system updates do not compromise vehicle safety or critical functionality. Quality control for Tesla software updat

Filed Dec 17, 2024 · Driver assistance, Electrical · VA

On or around December 1 2024, the **AP4 computer** in my 2025 Tesla Model Y shorted out, causing a **complete failure** of all systems controlled by this computer. The following safety-critical and driver-assist features have become **non-functional**: 1. **Cruise Control** (adaptive or otherwise) 2. **Forward Collision Warning** 3. **Lane Departure Warning** 4. **Lane Keeping Assistance** 5. **Blind Spot Warning** 6. **Parking Collision Warning** 7. **Full Self-Driving** and **Auto Park** features 8. **Cameras** required for Autopilot functionality Additionally, because the **GPS system has failed**, the vehicle’s **Navigation system** is inoperable. This impacts Tesla’s unique route planning feature that **sets up Supercharger stops** during long journeys. Without a functioning navigation system, I cannot properly plan my travel or locate charging stations, which severely affects the usability of the vehicle. **Safety Concerns:** The failure of these systems, especially safety features like forward collision warning, lane keeping assistance, and blind spot monitoring, puts both the driver and others on the road at risk. Losing access to safety-critical functions after an update is unacceptable and poses a serious danger to vehicle occupants and surrounding traffic. **Incident Details:** • The issue occurred **immediately following a software update**. • Tesla pushed the update **remotely** without providing any warning or indication of potential risks. • The failure appears to be related to a hardware short in the **AP4 computer**, directly caused or exacerbated by the update. **Desired Outcome:** • A thorough investigation into Tesla’s software update process and its effect on vehicle hardware and safety systems. • A resolution that prevents similar failures in other vehicles and ensures system updates do not compromise vehicle safety or critical functionality.

Filed Nov 29, 2024 · Driver assistance · CO

We were Driving East on I-40 at mile marker 245 Friday Nov 29 2024 around 8:50am in the right lane. We were passed by a gray Ford F-150 on the left. We had the "Traffic Aware Cruise Control" enabled. Our Tesla braked hard when the F-150 was directly beside us. The Ford was not in our lane at any point, and never changed lanes. Luckily a car behind us was not following too closely or an accident could have happened.