2015 Ford Mustang Speed Control & Cruise Problems

While driving home, driving speed was 55 mph, car engine bogged down and orange wrench icon illuminated on dash. I was not far from home and was able to continue and "limp" home. Car would not go faster than 10-15 mph. When I parked car in garage and shut car off, the brake lights stayed on. There was no warning lights or anything wrong with car before incident. Car has not been inspected by dealer or service center. Doing further research online, I was directed to look at drivers floorboard for plastic pieces. I did find broken, yellowish colored plastic pieces on floor board. According to others, which have been experiencing the same issue, the brake light switch stop bumper pad has failed. I was able to find a recall (Safety recall 22S02) that has been issued for this problem, but the recall is region specific. I do not live in the regions listed in recall.

Hi, I was driving on the freeway and suddenly my car stopped accelerating. I would push the acceleration pedal but it wouldnt speed up. And for a few times it would speed up very much. This was very rapid fluctuation. I also noticed that the cruise control was not working. This was very scary being on the highway with this kind of speed fluctuation. After i came back home, i noticed that the brake light wouldnt turn off at all. After doing some research i found that the brake light switch broke and the car was sensing that the brake was being applied and hence was doing acceleration fluctuations. I also found out that there are many other same vehicles which has the same issue.

I ran into the existing issue described in "Part 573 Safety Recall Report" NHTSA Recall Number 22V-011, but in a state not listed under the recall (vehicle purchased used in Pennsylvania in 2017). As a result of this part failing, my brake lights remained engaged permanently, and the car's engine power would increase and decrease rapidly (presumably because it thought I kept hitting the breaks). At time of writing I still have the broken pieces of the original part. I plan to take the vehicle into service within the week. There are no warning lights when this occurs since everything I'm the car is technically "operating correctly" - it just thinks the breaks are engaged constantly, and so has erratic behavior. The original recall lists high humidity as a cause, which Pennsylvania definitely has. I keep my vehicle outside 24/7, so it has definitely been part of many temperature swings.

Rubber stopper on brake sensor dry rotted and broke off. This caused the car to think I was applying the brakes when I wasn’t. It would cut the throttle while trying to maintain speed and my brake lights were always on even though I wasn’t touching the brakes or in the car for that matter.

TRYING TO ACCELERATE TO MAKE A LEFT HAND TURN I LOST ACCELERATION. THIS CONTINUED, STEP ON THE GAS AND NOTHING WAIT A FEW SECONDS AND THE CAR WILL ACCELERATE. CURRENT MECHANIC IS UNABLE TO DIAGNOSE. *TR

I WAS IN A PARKING GARAGE EASING DOWN A RAMP AT 5 MPH WHEN THE VEHICLE SUDDENLY ACCELERATED ON ITS OWN FORCING THE LEFT FRONT WHEEL OVER A SIXTEEN-INCH BARRICADE CAUSING THE DRIVER SIDE OF THE VEHICLE TO RISE SO FORCEFULLY THAT IT NEARLY FLIPPED UPSIDE DOWN. THE VEHICLE ROTATED 180 DEGREES AND LANDED ON THE PAVEMENT WITH SUCH FORCE THAT THE RACK AND PINION STEERING MECHANISM BROKE. MY EYEGLASSES FLEW OFF MY FACE AND LANDED SEVERAL FEET AWAY.

THE ABOVE VEHICLE IS A 2015 FORD MUSTANG ECO-BOOST CONVERTIBLE. IT IS EQUIPPED WITH ADAPTIVE CRUISE CONTROL. WHEN A VEHICLE IN FRONT SLOWS BELOW A SET SPEED OR A VEHICLE CUTS THE CAR OFF THE ADAPTIVE CRUISE CONTROL SLOWS THE CAR DOWN, OR STOPS IT, TO KEEP A PREDETERMINED DISTANCE. ACCORDING TO FORD THE SLOWING IS DONE BY THE ENGINE AND NOT THE BRAKES. ONCE THE VEHICLE SLOWS, AND IT IS SAFE, IT BEGINS TO ACCELERATE BACK TO THE SET CRUISE CONTROL SPEED. THE SLOWING, NOT BEING DONE BY THE BRAKING SYSTEM, DOES NOT ACTIVATE THE BRAKE LIGHTS. ONLY WHEN THE BRAKE PEDAL IS STEPPED ON WILL THE BRAKE LIGHTS COME ON WHICH ALSO WOULD DISENGAGE THE CRUISE CONTROL. WE HAVE HAD A COUPLE OF INCIDENTS IN WHICH THE VEHICLE BEHIND DOES NOT SEE THE CAR SLOWING, BY BRAKE LIGHTS, AND CLOSES AT A RAPID SPEED ON THE REAR OF THE CAR. LOOKING AT A DODGE RAM CLOSING, NOT KNOWING IT'S GOING TO STOP, CAN BE A BIT UNNERVING. I HAVE RECENTLY READ THAT THE AUTOMATIC BRAKING MAY BE INSTALLED ON FUTURE VEHICLES AS A STANDARD OPTION. I CAN'T IMAGINE THAT KEEPING A VEHICLE FROM CRASHING INTO A FORWARD MOVING VEHICLE IS ANY MORE OR LESS IMPORTANT THEN BEING STRUCK IN THE REAR BECAUSE BRAKE LIGHTS DON'T COME ON. I AM CERTAINLY MORE CAUTIOUS DRIVING THE ADAPTIVE CRUISE CONTROL ON BECAUSE OF THIS SAFETY ISSUE. I HAVE TALKED TO FORD "CUSTOMER RELATIONS DEPT" WHO WEREN'T SURE HOW TO FOLLOW THIS UP BUT TO SENT IT UP THE LADDER. I HAVE A FORD CASE #CAS-7876013. ...UPDATED 12/29/15 *BF ACCORDING TO FORD, THE SLOWING IS DONE BY THE ENGINE AND NOT THE BRAKES. ONCE THE VEHICLE SLOWS DOWN, AND IT IS SAFE, IT BEGINS TO ACCELERATE BACK TO THE SET CRUISE CONTROL SPEED. THE SLOWING NOT BEING DONE BY THE BRAKING SYSTEM, DOES NOT ACTIVATE THE BRAKE LIGHTS. ONLY WHEN THE BRAKE PEDAL I STEPPED ON WILL THE BRAKE LIGHTS COME ON WHICH ALSO WOULD DISENGAGE THE CRUISE CONTROL. THE CONSUMER STATED ON SEVERAL OCCASIONS, OTHER VEHICLES DID NOT OBSERVE HIM SLOWING DOWN BECAUSE THE BRAKE LIGHTS DID NOT ILLUMINATE. UPDATED 12/31/15. *JB

WITH ONLY 500+ MILES ON MY CAR TO DATE, I HAVE EXPERIENCED MULTIPLE OCCASIONS WHERE MY 2015 MUSTANG GT'S ENGINE SHUTS OFF WITHOUT WARNING WHEN I AM APPROACHING A STOP AND DISENGAGE THE MANUAL TRANSMISSION TO COAST TO A STOP. THE CAR DOES NOT GIVE ANY INDICATION THAT IT IS EXPERIENCING ANY ISSUES PRIOR TO OR DURING THE SHUTDOWN. THE ENGINE SIMPLY DIES. THIS LATEST INCIDENT NEARLY CAUSED AN ACCIDENT BECAUSE WHEN I WAS APPROACHING THE RED LIGHT I PUT THE CAR IN NEUTRAL WHILE SLOWING DOWN AND THE LIGHT SUBSEQUENTLY CHANGED QUICKLY TO GREEN--AND MY ENGINE DIED. THE CAR BEHIND ME HAD ALREADY ACCELERATED EXPECTING ME TO PROCEED BUT I WAS COASTING WHILE TRYING TO RESTART THE CAR. FORTUNATELY, THERE WAS NO REAR END IMPACT AND I RESTARTED THE CAR AND PROCEEDED. THIS IS A SERIOUS SAFETY ISSUE AND WHAT MAKES IT WORSE IS HOW RANDOM IT IS. FORD NEEDS TO FIGURE THIS OUT QUICK BEFORE SOMEBODY GETS HURT OR KILLED IN AN ACCIDENT RELATED TO THIS ISSUE. FOR THE RECORD, THERE ARE MANY OTHERS WITH THIS SAME MODEL CAR THAT ARE EXPERIENCING THE SAME DANGEROUS ISSUE AND ARE POSTING THEIR EXPERIENCES ONLINE AT THE MUSTANG GENERATION 6 FORUM. *TR