2021 Ford Explorer: adaptive cruise control problems

Filed Mar 25, 2026 · Acceleration, Driver assistance · MI

Everyday I get alerts saying the power train system, then I can’t use my cruise control, and many other alerts pop up

Filed Jun 10, 2025 · Driver assistance · TX

As I am traveling on the freeway or expressway, when I have cruise control active and I am in the far right lane the vehicle suddenly changes to the speed of the frontage road dropping my speed from 65 or 70mph down to 40, even tho I am on the expressway. It almost caused me to be rear ended because of the sudden drop in speed.

Filed Jan 1, 2024 · Acceleration, Driver assistance · VA

With the Ford Intelli-Cruise enabled in settings, the vehicle automatically adjust the speed while using the cruise control. The vehicle will randomly, quickly, accellerate to a extreme new speed limit it thinks it has detected. For instance, several times while travelling on I-81, with a 70mph speed limit, the vehicle will think the new speed limit is suddenly 85mph and quickly accelerate to that speed. I have attached a photo of the dash displaying that setting the car set by itself. On the flip side, once on I-81, it thought the speed limit was 35mph and quickly slammed on the brakes to slow to 35mph from 70mph. Both are quickly overridden by the driver tapping the brake and cancelling the cruise control. However, both could lead to hazards to other drivers potentially resulting in a wreck, especially the sudden slow to 35mph on the interestate. The dealership says "Yea, it happens and people complain". I have no idea why the speed changes, there are no road signs or other indications to even cause the system to re-evaluate its settings. Ford says Intelli-Cruise uses road signage and other ways to also determine speed (whatever that means). This is a safety issue that needs to be remedied by Ford. However, without the federal safety agency enforcement, they don't seem interested in resolution. (This website isn't allowing me to upload the .jpg file, upload button disappears when I click it)

Filed Oct 2, 2023 · Electrical, Fuel system · FL

The vehicle was self accelerating and applying forward propulsion. It was behaving as if the cruise control was on, cruise control was verified off. When braking was applied an alert was posted on the dash stating Braking applied, power reduced and the engine would rev higher. Upon stopping the vehicle and letting off on the brake the vehicle would accelerate as if the gas pedal was depressed. Upon parking the vehicle the engine would rev up to 6k rpm and if I let go of the brake the vehicle would accelerate. Turing off the vehicle and turning the vehicle on did not reset the issue. I verified no inadvertent pressure was being applied to the gas pedal and have video demonstrating the failure. The videos I have are too large to upload via your limitations on this page.

Filed Feb 16, 2023 · Acceleration, Driver assistance · VA

While using Intelligent Adaptive Cruise, the vehicle suddenly thought the speed limit was 85mph and quickly started accelerating. Confused, I hit the brakes to stop the acceleration. I have uploaded a photo of the dash that I took showing that the system read the speed limit sign as 85. I saw no speed limit sign in the area, so, I have no idea what prompted the system to change speed. I was talking on the phone via Android Auto and using Waze, via Android Auto, USB direct connect. The only other problem I've ever had with this system is on interstates that have specific Truck speed limits in West Virginia. There, sometimes trucks have slower speeds and this system picks up those truck speeds and decelerates/brakes to comply. While it can be overridden in the moment, the next time it sees such sign, it slows again. This sudden deceleration poses a hazard to other drivers who do not expect a 'non-truck' vehicle to suddenly slow.

Filed Jun 15, 2022 · Acceleration, Airbags · 10,000 miles · WA · crash

The contact owns a 2021 Ford Explorer. The contact stated the adaptive cruise control and the collision avoidance systems would malfunction. The vehicle would suddenly deactivate the cruise control and the collision avoidance would detect a non-existing object and stop the vehicle from also turning to avoid the crash. The contact stated that while idled at a stop light when the vehicle suddenly accelerated rear-ending the vehicle in front. The air bags did not deploy however the acceleration did not reach high enough speeds for such a response. A police report was not filed. The vehicle was not towed. There were no injuries or medical attention needed. The contact took the vehicle to the dealer however the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failures. The approximate failure mileage was 10,000.

Filed Oct 30, 2021 · Brakes · FL

Vibration: First use of the day, at about 35 MPH vehicle exhibits vibration throughout, especially around 40-41mph. Felt in steering wheel, seat, and with a loud rumble often heard. Has been since car was new. Has a vibration in rear view mirror at highway speeds. Goes away after driving for 15 miles or so, and at least a half hour. Returns after vehicle cools off. Cruise control: Adaptive cruise sometimes causes extreme braking at highway speeds for no reason. This happened while driving past a vehicle on Alligator alley causing all my passengers to comment, even though I had not touched the brake. Happened again 10/28 on 75 coming down from Sarasota. Braking: ABS engages on dry roads, especially when turning, for example into a driveway, but it cold be just a normal stop for a traffic light. The brakes also “grab” when coming to final stop, causing the car to stop suddenly

Filed Aug 4, 2021 · Acceleration, Driver assistance · OH

Adaptive Cruise control reads the overhead electronic posted 65MPH speed limit signs as 85MPH. This only occurs when traveling on I-670 eastbound between Leonard Ave and I-270 on the east side of Columbus Ohio...This section of highway was recently upgraded with "Smart Lane" overhead electronic signs. The dash on this vehicle shows the posted speed limit at all times, but if the cruise control is on the vehicle with automatically go to what it reads and in this case goes to 85MPH! I have driven this vehicle over 5000 miles in 4 different states and this situation only occurs at this particular locatiion. I have contacted State of Ohio, Department of Trtansportation and discussing this issue with Drive Ohio representative Luke Stedke ( [email protected])