NHTSA owner reports · September 18, 2026 snapshot.
Vehicle Speed Control complaints
118 reportsClear category filter80,000 miles · Nov 16, 2011
Vehicle Speed Control
TL* THE CONTACT OWNS A 2006 FORD FIVE HUNDRED. THE CONTACT STATED THAT AFTER ENGAGING THE BRAKES AND SLOWLY RELEASING, THE VEHICLE SUDDENLY LUNGED FORWARD. THE VEHICLE WAS TAKEN TO A DEALER WHO DIAGNOSED THAT THE THROTTLE BODY WAS DEFECTIVE AND NEEDED TO BE REPLACED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE WHO DID NOT OFF…
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TL* THE CONTACT OWNS A 2006 FORD FIVE HUNDRED. THE CONTACT STATED THAT AFTER ENGAGING THE BRAKES AND SLOWLY RELEASING, THE VEHICLE SUDDENLY LUNGED FORWARD. THE VEHICLE WAS TAKEN TO A DEALER WHO DIAGNOSED THAT THE THROTTLE BODY WAS DEFECTIVE AND NEEDED TO BE REPLACED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE WHO DID NOT OFFER ANY ASSISTANCE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 80,000 AND THE CURRENT MILEAGE WAS 88,000.
NHTSA ODI #10436135
74,500 miles · Nov 9, 2011
Engine And Engine CoolingFuel System, GasolineVehicle Speed Control
FORD 500 LURCHES SEVERELY AT RANDOM TIMES WHILE THE ENGINE IS ENGAGED. THIS HAPPENS MOST DANGEROUSLY AT HIGH SPEEDS, DUE TO DRIVER'S INABILITY TO CONTROL VEHICLE ADEQUATELY TO DEFEND AGAINST POTENTIAL CRASHES OR CONTROL SPEED DURING TURNS. THIS HAS CAUSED PROBLEMS ON THE SNOW AND ICE HERE IN ALASKA BECAUSE UNCONTROLLED ACCELER…
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FORD 500 LURCHES SEVERELY AT RANDOM TIMES WHILE THE ENGINE IS ENGAGED. THIS HAPPENS MOST DANGEROUSLY AT HIGH SPEEDS, DUE TO DRIVER'S INABILITY TO CONTROL VEHICLE ADEQUATELY TO DEFEND AGAINST POTENTIAL CRASHES OR CONTROL SPEED DURING TURNS. THIS HAS CAUSED PROBLEMS ON THE SNOW AND ICE HERE IN ALASKA BECAUSE UNCONTROLLED ACCELERATION REDUCES TRACTION. ALSO OCCURS AT LOW SPEEDS, WHICH IS MORE EASILY CONTROLLED THROUGH BRAKING, BUT REQUIRES EXTREME CAUTION IF ENGAGING VEHICLE WHEN PEDESTRIANS OR OTHER VEHICLES ARE NEAR. IT HAS SURPRISED AND SCARED ME ON MANY OCCASIONS SINCE I FIRST PURCHASED THIS CAR A MONTH AGO, BUT THE REASON I AM WRITING THIS IS BECAUSE I HAD A SCARY INCIDENT TODAY WHEN PULLING OUT OF A GROCERY STORE PARKING LOT (PEDESTRIANS IN FRONT OF ME WHEN IT SUDDENLY JUMPED AS SOON AS ENGINE ENGAGED). TOOK IT TO THE MECHANIC AND DIAGNOSTIC CHECK SAYS ISSUES WITH FUEL DELIVERY SYSTEM. THE MECHANIC STATED THAT AFTER RESEARCHING THE ISSUE THIS IS A VERY COMMON PROBLEM FOR THIS MODEL AND THAT IT IS MOST LIKELY THE THROTTLE BODY, AND SAYS THE CAR SHOULD NOT BE DRIVEN IN ITS CONDITION. IT IS ONE OF THE SCARIEST ISSUES I'VE EVER HAD TO DEAL WITH. AFTER READING MORE ABOUT IT ON THE INTERNET THIS EVENING IT SEEMS THAT THIS ISSUE IS VERY COMMON AND HUNDREDS OF PEOPLE HAVE HAD SIMILAR SCARY INCIDENTS WITH THIS CAR THAT THEY HAVE REPORTED ONLINE. IF THIS MANY PEOPLE ARE WRITING ABOUT IT ONLINE, PRESUMABLY THERE ARE THOUSANDS MORE WHO ARE HAVING THE SAME PROBLEM AND DO NOT HAVE THE RESOURCES OR KNOW HOW TO REPORT THE ISSUE. *TR
NHTSA ODI #10435115
102,000 miles · Oct 30, 2011
Power TrainVehicle Speed Control
THE VEHICLES WARNING INDICATOR LIGHT OF A WRENCH LIT UP INDICATING TRANSMISSION/THROTTLE BODY SERVICE. HAD PREVIOUSLY HAD TRANSMISSION INSPECTED AND WERE NO PROBLEMS. THE CAR WILL THRUST IN DIRECTION CAR IS IN GEAR OF SUCH AS WHEN CAR IS IN REVERSE IT WILL THRUST AND LUNGE BACKWARDS ALSO IN DRIVE LUNGE FORWARDS. IT ALSO IS ENHAN…
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THE VEHICLES WARNING INDICATOR LIGHT OF A WRENCH LIT UP INDICATING TRANSMISSION/THROTTLE BODY SERVICE. HAD PREVIOUSLY HAD TRANSMISSION INSPECTED AND WERE NO PROBLEMS. THE CAR WILL THRUST IN DIRECTION CAR IS IN GEAR OF SUCH AS WHEN CAR IS IN REVERSE IT WILL THRUST AND LUNGE BACKWARDS ALSO IN DRIVE LUNGE FORWARDS. IT ALSO IS ENHANCED WHEN THE CARS HEATER OR A/C IS RUNNING. HAVE RESEARCHED AND MANY, MANY PEOPLE HAVE HAD SIMILAR PROBLEMS AND COMPLAINTS. *TR
NHTSA ODI #10433615
70,000 miles · Oct 19, 2011
Vehicle Speed Control
TL* THE CONTACT OWNS A 2006 FORD FIVE HUNDRED. THE CONTACT STATED THAT THE VEHICLE WOULD HESITATE TO ACCELERATE FROM A COMPLETE STOP AND WOULD STALL SPORADICALLY. THE CHECK ENGINE LIGHT WOULD ALSO ILLUMINATE ON THE INSTRUMENT PANEL. THE VEHICLE WAS TAKEN TO AN INDEPENDENT REPAIR SHOP AND THE CONTACT WAS INFORMED THAT THE VEHICLE…
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TL* THE CONTACT OWNS A 2006 FORD FIVE HUNDRED. THE CONTACT STATED THAT THE VEHICLE WOULD HESITATE TO ACCELERATE FROM A COMPLETE STOP AND WOULD STALL SPORADICALLY. THE CHECK ENGINE LIGHT WOULD ALSO ILLUMINATE ON THE INSTRUMENT PANEL. THE VEHICLE WAS TAKEN TO AN INDEPENDENT REPAIR SHOP AND THE CONTACT WAS INFORMED THAT THE VEHICLE NEEDED A NEW THROTTLE. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 70,000.
NHTSA ODI #10430812
Mileage unknown · Oct 16, 2011
Electrical SystemService Brakes, HydraulicVehicle Speed Control
THE INSTRUMENT CLUSTER CHECKS NORMAL ON MOST START-UPS, BUT UNPREDICTABLY ALL SYSTEMS LIGHT UP SHOWING FAILURE OF ABS, AIR BAGS, TRACTION CONTROL, ELECTRICAL SYSTEMS, SEE A MECHANIC, CRUISE CONTROL AND SPEEDOMETER QUITS WORKING. THE WARNING LIGHTS MAY STAY LIT FOR 2 TO 200 MILES. AND NO SPEEDOMETER. AUTO ZONE AND MY MECHANI…
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THE INSTRUMENT CLUSTER CHECKS NORMAL ON MOST START-UPS, BUT UNPREDICTABLY ALL SYSTEMS LIGHT UP SHOWING FAILURE OF ABS, AIR BAGS, TRACTION CONTROL, ELECTRICAL SYSTEMS, SEE A MECHANIC, CRUISE CONTROL AND SPEEDOMETER QUITS WORKING. THE WARNING LIGHTS MAY STAY LIT FOR 2 TO 200 MILES. AND NO SPEEDOMETER. AUTO ZONE AND MY MECHANIC ARE BAFFLED AND FRUSTRATED AFTER CHECKING BATTERY CHARGING CIRCUIT CONNECTIONS AND GROUNDS. ITS OBVIOUSLY NOT SAFE DRIVING WITHOUT KNOWING YOUR SPEED OR IF THERE IS A MAJOR HAZARD LOOMING-----LIKE FIRE. *TR
NHTSA ODI #10430388
68,690 miles · Oct 12, 2011
Power TrainVehicle Speed ControlCrash
I'M NOT SURE IF THIS IS A POWER TRAIN OR OTHER PROBLEM, CAR LURCHES DANGEROUSLY AT LOW SPEEDS, AND WHEN CHANGING GEAR INTO AND OUT OF REVERSE. I HIT A POST PARKING IN AUGUST OF 2010 DUE TO THIS, AND IT'S BEEN GETTING GRADUALLY WORSE. TOOK IT TO THE DEALER WHO REPLACED A BROKEN UPPER MOTOR MOUNT THAT WAS CONNECTED TO THE TRANSM…
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I'M NOT SURE IF THIS IS A POWER TRAIN OR OTHER PROBLEM, CAR LURCHES DANGEROUSLY AT LOW SPEEDS, AND WHEN CHANGING GEAR INTO AND OUT OF REVERSE. I HIT A POST PARKING IN AUGUST OF 2010 DUE TO THIS, AND IT'S BEEN GETTING GRADUALLY WORSE. TOOK IT TO THE DEALER WHO REPLACED A BROKEN UPPER MOTOR MOUNT THAT WAS CONNECTED TO THE TRANSMISSION. DIDN'T HELP, ALTHOUGH IT SEEMED LIKE A GOOD GUESS AT THE TIME. IT HELPS TO KEEP FOOT FIRMLY ON BRAKE WHEN CHANGING GEAR OR HOLDING STILL, WHILE THE CAR TRIES TO LURCH FORWARD (OR BACK) WITH UNPLANNED ACCELERATION. SEEMS TO BE GETTING INCREASINGLY WORSE AND NOW I DON'T FEEL IT'S SAFE TO LET ANYONE ELSE DRIVE IT, LIKE AT VALET PARKING. TAKING IT BACK TO DEALER TOMORROW, BUT WE LET WARRANTY EXPIRE RECENTLY DARN IT. WE GET SO MANY FAKE SPAM WARRANTY-EXPIRING PHONE CALLS THAT I GOT CONFUSED AND DROPPED THE BALL. THROTTLE CONTROL MODULE MAY BE GIVING FALSE SIGNAL TO CARBURETOR, NOT SURE WHAT IT IS. *KB
NHTSA ODI #10429546
Mileage unknown · Sep 19, 2011
Power TrainVehicle Speed Control
THE CAR LUNGES IN DRIVE AND REVERSE WITHOUT ACCELERATING. THIS IS DANGEROUS AS WHEN BACKING OUT OF GARAGES OR PARKING PLACES. TRYING TO TAKE OFF SLOWING IS NOT POSSIBLE. *KB
NHTSA ODI #10426263
68,000 miles · Sep 8, 2011
Vehicle Speed Control
AS I WAS BACKING OUT OF A PARKING SPACE IN A PARKING GARAGE THE ENIGINE REVED UP AND JUMPED HITTING A BEAM IN THE GARAGE. UPON IMPACT THE ENGINE WAS STILL REVED SO I IMMEDIATELY TURNED THE ENGINE OFF AND BACK ON. THE ENGINE CONTINUED TO REV UP AND THE CHECK ENGINE AND YELLOW WRENCH ILLUMINATED. THE CAR WAS TOWED TO A DEALERSHIP …
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AS I WAS BACKING OUT OF A PARKING SPACE IN A PARKING GARAGE THE ENIGINE REVED UP AND JUMPED HITTING A BEAM IN THE GARAGE. UPON IMPACT THE ENGINE WAS STILL REVED SO I IMMEDIATELY TURNED THE ENGINE OFF AND BACK ON. THE ENGINE CONTINUED TO REV UP AND THE CHECK ENGINE AND YELLOW WRENCH ILLUMINATED. THE CAR WAS TOWED TO A DEALERSHIP IN WHICH THEY REPLACED THE THROTTLE BODY AND THE CAR WAS DRIVEN TO A LOCAL BODY SHOP FOR REPAIRS. TOTAL COST OVER $1200 YESTERDAY, SEPTEMBER 7, 2011, (MILEAGE 108000 AND SPEED FROM 0-40 MPH) AS I WAS DRIVING TO WORK THE CHECK ENGINE LIGHT CAME ON. EACH TIME I WOULD STOP THE ENGINE WOULD REV AND WHEN I WOULD ACCELERATE IT WOULD JUMP AND REV. NOT WANTING A REPEAT OF THE LAST ACCIDENT, I TOOK IT TO A MECHANIC NEAR WORK WHO STATED THAT THE THROTTLE BODY NEEDED TO BE REPLACED AGAIN ALONG WITH THE ENGINE MOUNT. TOTAL COST $1076 AFTER RESAERCHING THIS PROBLEM IT SEEMS THAT IT IS A TYPICAL ISSUE WITH THIS TYPE OF VEHICLE. MOST HAVE INCLUDED THAT THEY ARE FEARFUL THAT THEY WILL BE INJURED OR INJURE SOMEONE ELSE IN A ACCIDENT. *TR
NHTSA ODI #10424255
45,000 miles · Sep 6, 2011
Fuel System, GasolineVehicle Speed Control
WHEN GOING SLOW LIKE PULLING INTO AND OUT OF A PARKING SPACE OR GOING THROUGH SCHOOL LINE, CAR WILL "SURGE" OR LUNGE UNEXPECTEDLY. VERY UNSAFE FOR THE PEOPLE AND VEHICLES NEARBY. *TR
NHTSA ODI #10423880
98,000 miles · Sep 1, 2011
Vehicle Speed Control
THE VEHICLE LURCHES FORWARD AND HAS STALLED ON A BUSY STREET. THE CAR WAS TAKEN TO A MECHANIC WHERE THE OWNER WAS TOLD THAT THE PROBLEM WAS THE THROTTLE BODY, BUT IT WAS SAFE TO DRIVE UNTIL THE REPAIR COULD BE MADE. THE REPAIR HAS NOT YET BEEN MADE. *TR
NHTSA ODI #10422972
NHTSA investigations
1PE11018 · Idle Instability
Opened May 11, 2011 · Closed Feb 7, 2013
Status: closed (inferred from source dates) · Vehicle Speed Control
On November 29, 2012, Ford Motor Company (Ford) initiated Customer Satisfaction Program 12N03 to extend warranty coverage terms for repair of engine idle RPM surge caused by throttle body deposits in all model year (MY) 2005 through 2007 Ford Freestyle, Five Hundred and Mercury Montego vehicles.The program extends the coverage for up to 10 years of service or 150,000 miles from the warranty start date of the vehicle (all vehicles are eligible for the program through May 31, 2013, regardless of mileage).Dealers will repair vehicles exhibiting the condition by removing and cleaning the throttle body and reprogramming the PCM with software containing an updated idle speed control strategy.According to Ford, some of the affected vehicles may experience momentary, intermittent engine idle RPM surge (idle flare) when stopped or during low speed driving maneuvers such as in a parking lot or driveway.Unstable idle speed control (dips and flares) around the target engine speed (700 rpm) can occur in vehicles with deposit build-up in the throttle body when the system adjusts engine speed in response to changes in engine load, typically from power steering application or air-conditioner compressor cycling.Idle speed control logic is only active at vehicle speeds below 3.5 mph and when the accelerator pedal is not applied.Ford testing of a vehicle with a worst case throttle body measured a maximum idle flare of 1360 RPM lasting approximately 1 second, which Ford indicated was consistent with system design to limit vehicle speed and acceleration in idle control mode.Ford indicated that the test vehicle was held in place with normal brake effort and that vehicle speed remained under 4 mph without the brake pedal applied.In addition to throttle body deposit accumulation, symptoms associated with the condition may include Check Engine lamp illumination and diagnostic trouble codes (DTCs) P0505, P0506 or P061B.Ford attributed the surge condition to changes in idle air flow resulting from the progressive buildup of deposits in the throttle body from normal Positive Crankcase Ventilation (PCV) system operation.This condition was not adequately compensated for in the original Powertrain Control Module (PCM) calibration.Ford issued a technical service bulletin on August 15, 2011 (TSB 11-8-5), releasing an updated powertrain control calibration for vehicles with CVT transmissions.On October 19, 2011, Ford issued a second bulletin (TSB 11-10-21) superseding TSB 11-8-5 and including updated powertrain control calibration for vehicles with 6-speed transmissions.Prior to Ford issuing the TSB?s, owner?s experiencing the alleged defect either received no repairs, if dealers could not duplicate the condition, or had the throttle body cleaned or replaced, which only provided temporary correction until the throttle deposit build-up returned.Ford?s revised powertrain calibrations appear to be effective remedies for the idle instability caused by build-up of throttle body deposits.However, even after the TSB?s were released, many owners experiencing the condition continued to have difficulty with proper diagnosis and repair as dealers were often either unable to duplicate the condition or were unfamiliar with the new repair procedures.Ford's new program addresses those concerns.NHTSA's testing and complaint analysis indicate that the idle speed control issue in the subject vehicles can only occur at very low speeds, are very brief events, are easily controlled by moderate brake pedal forces and result in minor increases in vehicle speed even with no braking.This investigation is closed.The closing of this in