Audi A4 adaptive cruise problems

Filed Aug 18, 2025 · Engine · VA

The turbocharger wastegate actuator failed suddenly at highway speeds, causing loss of engine power and making it extremely difficult to maintain highway speeds. The warnings that suddenly appeared caused the cruise control to cease working as well. The dealership (Audi Miami South by The Collection) inspected the vehicle and confirmed the wastegate actuator seized, requiring a complete replacement of the turbocharger. The vehicle has 53,000 miles.

Filed Jun 23, 2025 · Electrical · UT

The Audi MMI (Multi Media Interface) system will continually shut down and Reset/reboot while driving. It will happen sometimes 3-4 time within a 20 minute drive. The MMI plays a crucial role in enhancing safety features by providing a user-friendly interface for managing various driver assistance systems and safety-related functions. These include features like emergency calls, roadside assistance, and the integration of driver assistance systems like adaptive cruise control and collision avoidance assist.

Filed Apr 9, 2021 · Brakes, Driver assistance · 112,000 miles · CA

On my car when I'm driving anywhere after I put my cruise control on if I press up or down on the cruise control to change the speed the car will either brake or speed up and it won't stop until I hit my brakes hard and turn the cruise control completely off which is also an issue because my brakes are going out extremely fast like I need a new pair every 2-3 months and the car also burns through oil so quickly that I need to add more within 2-3 days after an oil change with no leaks and it's burning more oil than gas which is clogging up my catalytic converter........ And causing my emissions to be bad.....

Filed Jul 3, 2018 · Transmission · 64,000 miles · CA

On 7/2/18 I merged on to 280 s from moorpark avenue in san jose. I had driven about a mile @ 60 (I do not use cruise control) when engine started to accelerate unexpectedly. I stepped on brake which slowed my vehicle but when I removed foot from brake it started to accelerate again. I was able to exit freeway safely and pull over into an empty parking lot. When I turned off engine I believe I hear a loud "roar" noise. Experience was frightening. I was afraid I would lose control of vehicle and cause major injury. I checked floor mat and floor to see if there was obstruction but there was none. I called tow company but after waiting 3 hours for c&m towing to not show up I decided to driver car around parking lot to see how it would drive. It drove fine so I drove home on surface streets. The next day took 2008 audi a4 with 64k miles in to our mechanic. Diagnostics did not show any error codes.I do not know what caused sudden acceleration. Still I need to report this for the public record,in the event this happens again to me or others and it does not end well. Linda

Filed Oct 28, 2013 · Acceleration, Electrical · 41,000 miles · NY

I was driving my 2004 audi a4 (1.8, convertible) on a local road at approx 30mph, when the accelerator suddenly dropped from under my foot and the car accelerated very rapidly. It felt like the cruise control had come on by itself (the cruise control was completely off at the time). I put the car in neutral and pulled over. When I shut the car off, the gas pedal popped up and felt normal. When I turned the car back on several times, it continued to immediately accelerate all the way with the gas pedal dropping to the floor. The car is now being towed to a mechanic. Had I been in a tighter situation at the time, it could've been ugly.

Filed Apr 18, 2012 · Acceleration · 74,000 miles · UT

On three separate occasions over the past 3 years, we have lost control of acceleration in our 2004 a4. I have pressed my accelerator to pass on a highway and the accelerator continues to go down increasing speed of car against my will....on first two occasions I was able to pump breaks and kick gas pedal for release (and assumed it was a mat issue, however I started to question that issue on the second occasion after inspection of my mat and I also felt like the pedal pressed away from my foot all its own, like on cruise control even thought my cc was not on)....however tonight my husband was driving and the same thing happened accelerating from a red light, since I had experience with this problem I knew to flip it into neutral...however engine continued to rev at high rpms once we got to the side of the road, turned car off and on...still rev'd up. Finally on the second time turning car off and on again we proceeded home and car drove fine. This is the car I drive my children in and I have come across many similar incidence online which is how I found this site...I want to get rid of car but have reservations about selling it to someone else. All incidences online that I come across audi dealerships does nothing, I plan to take my car in tomorrow as I now know for sure it is not a mat issue. Did we not just deal with this same issue with toyota.

Filed Apr 17, 2012 · Acceleration · LA

On two occasions, april 3, 2012 and april 9, 2012, while traveling with the cruise control set at 78 MPH, without touching the control or accelerator, the control setting jumped to 90 MPH and the vehicle began to rapidly accelerate. When the brake was applied, the cruise control disengaged.

Filed Nov 24, 2010 · Acceleration · 52,447 miles · PA

1. On november 4th, I traveled early in the day from pittsburgh to altoona, pa using my cruise control often on the highways and roads. I returned to pittsburgh after work and I picked up my daughter at school around 5 pm. We drove and went to dinner. We drove and attended an event at 7:30 pm. 2. Following the college admissions event around 9:00 pm, we drove several miles to our home. As we were leaving downtown pittsburgh, and one mile from our home, the car's accelerator pedal remained down on its own, pushing the car forward. I stood on the brake to stop the car as we came to a stop light. I took my foot off the brake and the accelerator pedal remained in the down position with the car accelerating on its own. I once again stopped the car by standing on the brake. I then tried to lift the pedal physically with my hand and foot, believing that would help. I also tried moving the mat. The car had been inspected two weeks earlier and the mat lock was not put back on. The car was moving on its own. I stopped the car by standing on the brake, put it in park and the engine revved very high and I quickly turned off the engine. This had never happened before in the nearly 2 year history of owning the car. For one mile, the car's accelerator was stuck to the floor of the vehicle. 3. In the morning, I called the dealership that services the car and had conducted the inspection two weeks earlier. I used my aaa service to tow the car into the dealership. The tow truck driver did start the car and the pedal was no longer stuck. The dealership was unable to recreate the event and returned my car in one week stating they had opened a file, contacted the manufacturer, and that I could come and take my car back and drive it. It appeared they drove it 35 miles in that time period. I am driving the car and I have not used my cruise control. I remain concerned for the safety of myself, my family and my community. I am not sure what I should do.

Filed Jul 28, 2010 · Acceleration · 63,000 miles · MA

While driving my 2003 audi a4 on the mass pike freeway into boson, as I approached a toll booth, I tapped the break to disengage the cruise control. The car slowed down so that I passed through the toll both at approximately 18 MPH. After passing through the toll booth, I again started to accelerate, but once touching the gas pedal, it seemed to go down on its own, and the car accelerated, not under my control. I immediately stepped on the brakes to slow the acceleration, but as soon as I took my foot off the brakes, the car continued to accelerate to about 60 MPH, at which point I applied the breaks again. Luckily, traffic was minimal, and I was able to keep constant pressure on the brake pedal to keep the car speed down, and avoid other vehicles while the brakes and accelerator worked against each other. Initially, there was nowhere to pull the car off the road, but then as I approached a small pullout, I moved the car into the outside lane and turned off the engine. I thought maybe the cruise control had malfunctioned, and by turning off the car, it would be reset. So after setting several minutes, with the car in park, I tried starting the car. The engine immediately revved up to full speed, so I again turned the car off. After setting another 10 minutes, I tried starting the car again, and it started normally. I was able to drive the car home without experiencing any additional acceleration issues. Audi looked at the car and determined it was a faulty brake switch that prevented the cruise control from disengaging. However, the cruise control was not active when the uncontrolled acceleration occurred, and their own mechanic said the faulty switch would not explain the full throttle engine start after shutting off the engine. They said they replaced the brake switch but will take no further action. Based on the audi mechanics comments, I do not feel the issue has been resolved.

Filed Apr 18, 2010 · Acceleration · 49,500 miles · VA

I believe this may be a repeat complaint, but ms. Demeter says it is not on file. 2005 audi a4 cabriolet, 6 cylinder (normally aspirated). Sudden persistent acceleration. I was rapidly accelerating from about 25 MPH going up a hill trying to make a green light about .2 mile away. When I approached the intersection, I released the pedal but the car kept accelerating. Firm brake pressure slowed the car, but it reaccelerated until I brought it to a stop. I made sure the cruise control was in the "off" position, even though I had not used it. I drove about 2 miles to the next major intersection, where I stopped for alight. While I was sitting there with my foot on the brake, the engine began to rev. I put the vehicle in neutral, and it redlined. I turned the car off, and reached down to see if the floor mat was out of place. I gave it a pull but did not feel it over the gas pedal. I started the car again, and slowly accelerated away form the intersection. The problem has not recurred, even when I tried to reproduce it.