Vehicle Speed Control Problems of Mercedes Benz CLA250

Apparently the tps (throttle position sensor) which is built into the gas pedal on this 2014 mb Cla250 only lasts so long before it becomes defective under highway conditions and causes the vehicle to go into limp mode. When full acceleration is necessary, the unit will work for perhaps a few months or less, and then continue to fail worse and more frequently with each attempt at full acceleration. At highway speeds, this is an essential feature in a 4-cylinder vehicle such as this one and without the necessary acceleration capability, can expose the driver to serious risk of collision with other on-coming vehicles traveling at highway speeds. This "limp mode" features is extremely dangerous and hazardous to not only the driver of their vehicle, but to other drivers around them since they are left in a devastating position of being unable to accelerate normally and as necessary and as one would expect in any vehicle, let alone a Mercedes Benz. Never before have I driven a car that falls out of full acceleration mode only to subject the driver to serious collision circumstances. Whoever the imbecile is at mb engineering who incorporated this limp mode feature should be fired!!! to make matters worse, this cheaply built tps, which is the cause of the problem in my vehicle specifically, was only warrantied twice by the dealer and now they will not replace it under warranty which is a two-year period. I've only had the part 5 months before it failed again due to poor manufacturing and I had to pay all over again for a new one despite my warranty validity. There have been many other mb owners who have the same complaint for limp mode, which tells me that it's definitely not me, but rather the poorly built or engineered vehicle, as a matter of fact. Mb has denied having these complaints to me, which of course, is a lie. That's misleading and deceptive business practices in my state and mb needs to live up to its warranty provisions and respect its customers.

See all problems of the 2014 Mercedes Benz CLA250 🔎.

Date of occurrence: 03/05/2024 subject: formal claim regarding traffic safety issue with 2021 Mercedes Benz cla 250 I am writing to formally submit a claim regarding a recent traffic safety incident involving my 2021 Mercedes Benz cla 250. While driving to my destination, I encountered a sudden loss of power and inability to accelerate. To ensure the safety of myself and other drivers, I activated my emergency lights and cautiously proceeded at a limited speed of approximately 30 mph, accompanied by a strained engine sound. Understanding the potential risks associated with this issue, I immediately pulled over in a safe location and had to drive the vehicle with caution to my home where I then arranged for my vehicle to be towed to the service department. Upon inspection, the service department informed me that the problem stemmed from a software malfunction, for which mercedes has not yet released an updated version. Given the nature of this incident and the potential safety hazards it poses, I am deeply concerned about the safety of driving my vehicle on the freeway or to any destination. I kindly request your assistance in addressing this matter promptly and ensuring the necessary steps are taken to rectify the software malfunction. Please let me know the next steps in the claims process, any additional documentation or information required, and the estimated timeline for resolution. I appreciate your attention to this matter and look forward to a swift resolution. Thank you.

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Incident on 10/18/21, while coasting into a parking space, my car suddenly accelerated and smashed into a concrete wall. Damage was extensive and car was determined a loss. Service was maintained throughout ownership. There was no warning, no lights, messages, no abs brakes. Airbag did not deploy. Extensive seatbelt bruising. I'm upset car was a loss but I would never feel safe driving it. It was as if someone else had taken over control and I was powerless to alter the situation.

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The contact owned a 2019 Mercedes Benz Cla250. The contact stated that while driving into the parking garage the vehicle suddenly experienced unintended acceleration causing the driver to lose control of the vehicle and crash into a brick wall and a parked vehicle. During the incident, the driver sustained head trauma and bruising of the limbs. The vehicle was destroyed and towed away. A police report was taken at the scene. The cause of the failure was not determined. The local dealer and manufacturer were both notified of the incident. The failure mileage was 20,000.

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When accelerating hard to overtake, the engine lurches, and the car fails to accelerate further and slows down. The engine fault light then illuminates which switched off by itself after switching the engine off twice. It seems I am not the only person to have this problem as you can see in the comments to this video describing the problem and claiming the problem is a faulty high pressure fuel pump: https://youtu. Be/-sbr28zbofs this seemingly common issue is clearly dangerous as drivers lose the power when they are most depending on it and it seems to be occurring in cars that are not particularly old.

While merging onto the freeway on 1/22/2021 the car's dashboard displayed "collision prevention assist plus inoperative " and the check engine light come on. When this happened, it prevented me from accelerating the car by pushing onto the gas pedal. This caused the car from behind to almost rear ended by car. I was able to drive onto the shoulder of the freeway and exit the freeway. I have taken this car to the mercedes dealership for repair but it is an ongoing issue even after various parts have been replaced.

See all problems of the 2016 Mercedes Benz CLA250 🔎.

I was driving my car when all of a sudden the car slowed down and the steering became stiff. The pre safe light came on the screen along with "parking brake" "traction control" although the parking brake was not applied. I had to have my car towed home because it was unsafe to drive.

See uploaded document protected auto issues for full story. Hennessy Buick, Mazda, GMC sold me a car 8/18/2017 unknowingly I discovered on 2/5/2019 that it had an illegal can blocker/switch (manipulates computer systems in car and tampers true mileage on car) installed in ignition switch. After obtaining emissions test 12/26/2018, several car failures began to happen while stationary at testing center. While in motion that day, several lights began to stop working. In January 2019, while driving the power steering failed causing me to be unsafe as I could not brake, gas or turn wheel. The block affected all items above, excluding wheels & visibility,but due to limitations I was only able to select 3.

While driving at normal street speed "collision prevention assist inoperative" displayed and car would not accelerate. I was in traffic, but was able to exit and pull over and park, turned car off, & back on. Display reset and car normal. Took to dealership immediately-repair was "non connecting pins". Too early to tell if this solves. Upon investigation, this is a common issue with 2014 mb and I want to document this extremely dangerous performance.

Car taken to Mercedes Benz service department on 1/3/2018 for collision assist system failure on 12/30/2017 causing car to lose power, collision assist system warning alert, auto braking (all at highway speed while entering highway from on-ramp). Only solution was to limp to side of freeway and turn off car, then restart. All warnings cleared, car returned to normal state. Able to drive. Occurred twice before (12/22/2017 and 12/23/2017). After receiving car back from Mercedes Benz service department, reported issue was CA sensor was loose in its seat after visual inspection. Reported to have replaced sensor and re-seated, initial startup on CA module including update and calibration, test drive of 9 miles without incident, reported as "everything functioning at this time". Vehicle retrieved from mb on 1/4/2018. On 1/6/2018, issue occurred again after making right hand turn on surface road and accelerating to approximately 25 mph (45 mph zone). Same situation: loss of power, auto dampening, collision assist warning and chimes. Taking vehicle back to mb service department. This is a known issue among 2015 mb Cla250s, as reported on mbworld blog site - https://mbworld. Org/forums/c-class-w205/584375-collision-prevention-assist-plus-inoperative-error. Html.

Yesterday I was travelling back home from office in the evening on highway, and suddenly my Cla250 started showing message on console saying "pre safe features limited - see operators manual' and "vehicle inoperative - see operators manual" and lost its throttle, I was unable to accelerate, from 50mph I came down to 20mph within seconds and it was very scary as there were vehicles behind me thinking what I was upto. I immediately switched on flashers and tried my best to pull it back to small space between divider and exit, there was no proper shoulder space so got some scratches on my car. I had purchased this car from dealer as certified preowned vehicle just two months ago, and this was first time I was in such pathetic situation. I called roadside assistant and they were ready to send towing truck, meanwhile I turned off the engine and restarted it and all the messages disappeared and everything looked okay. I made a decision to go back home, as if my car were to be towed late in the evening , I wouldn't get car back the same day,and service center is like 30 miles away and there is nobody to drop me back home. So I decided to take it home and cancel towing truck call. Car moved fine from then on. Today I came to office in car fearing when it would stop again. I called the dealership and what they said was "OH don't worry, that must be some software glitch on pre safe condition, if it happens again bring it to dealership!!" . So literally I need to put my life and other drivers life at risk to wait and see if it happens again. I like my car, but definitely I don't want to die in it, neither I want to hurt someone else due to this so called software glitch.

Purchased a mercedes cla 250c, and have had it became inoperative while driving on the beltway in washington d. C. Traffic, and more recently on the I-5 in san diego on 1/21/2017 during rain at speeds of 60+ mph in heavy traffic. The vehicle decelerated quickly and lost speed. The console popped up flashing message 'pre-safe functions limited' on the console. The vehicle did not respond to accelerator. After coasting to the right shoulder I was hit, by a passing car, and the motorist kept on going. This had happened about 10 time, and I bought the vehicle new. Mercedes aware, yet they would not do anything because they said if the engine light is not on we cant diagnose it.

The contact owns a 2015 mercedes-benz Cla250. While driving 75 mph, the vehicle independently began to decelerate and lost power. The vehicle was towed to the dealer where it was diagnosed that the throttle actuator failed and needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The approximate failure mileage was 12,000.

Vehicle became inoperative while driving on a highway. Happened twice today on speeds of 60+ mph in heavy traffic. Vehicle decelerated quickly and lost speed, I was lucky to avoid collisions. The console popped up flashing message 'pre-safe functions limited' on the console. The vehicle did not respond to accelerator. After switching the ignition off and on again, the problem temporary disappeared, but then happened again. The vehicle is duly serviced and is still on warranty, there was no accidents or mechanical faults prior to date. Scary and very dangerous. Could have easily injured myself or someone else who would have hit the vehicle which suddenly becomes inoperative.

I have had the same issue as many others. I was driving my car down the highway in the left lane at 65 mph. All of a sudden the speedometer dropped to 0 and I could not accelerate. I had to pull over to the side of the road and turn off the car. This first happened to me twice in December 2013. I took it into the dealership and they did several things to try and fix it. They told me they updated the software. I was scared to continue driving the car, but they assured me it wouldn't happen again. But, the same issue just happened to me again (June 2016). Why hasn't mercedes done anything to fix this? I don't wan to drive a car that loses speed while I'm on a busy highway, it's not safe.

Multiple episodes of "pre-safe functions limited" occurring. When this message appears the car suddenly loses acceleration and you are not able to go above 30 mph despite pressing on the gas pedal. This has occurred on normal 35-45 mph streets but has happened multiple times on the highway when the car is going 65 mph. Luckily, no motor vehicle accidents have occurred because of this issue. The car is able to accelerate and function normally after turning the engine off and on again. Have gone to mercedes dealer multiple times to fix issue. The first time it occurred, mercedes updated system software. Next they replaced vehicle sensors. Most recently they claimed the issue was due to oil pump failure. They replaced an oil control valve and oil pan. Four days after the repair I received the same "pre-safe functions limited message, my car stalled while I was going 40 mph. I have returned the car to the dealer once again to run diagnostics. This has occurred many times in the two and a half years that I've owned the vehicle. It is currently at 49,200 miles and has been properly serviced. Each time I bring the car in for this error message mercedes replaces a new part but it does not solve the problem.

Pre safe functions limited error message repeatedly comes on and loses acceleration.

See all problems of the 2013 Mercedes Benz CLA250 🔎.

While driving at highway speed the accelerator pedal suddenly failed. The engine would not respond to any input of the gas pedal. I pumped the pedal, floored the pedal all with no response. The engine would not rev past idle and the car lost speed making changing lanes difficult and dangerous. The error messages shown in the photos appeared in the dashboard. This has happened twice (11/30/15 and 12/6/15).

Purchased my new Cla250 in September 2014. In August of 2015 my car suddenly stopped accelerating while driving 65mph on the NJ garden state parkway!. The pre-safe warning was present on my dashboard. Luckily I was able to pull to the shoulder without causing an accident. This could have caused a major catastrophe killing me and others. I restarted the engine and drove to my destination making sure I stayed in the right lane on the parkway. It failed 2 more times while not on the highway but still a very dangerous situation. Took the car (which had 16,000 miles) to a mercedes dealership when I returned and they performed a series of tests. They found a product technical support system update which involved updating the software. The failure did not occur again until Nov. 2017. I almost got hit by a bus in philadelphia when my car decided to stop accelerating. Finally, driving to the airport doing 70mph the car again displayed the pre-safe warning and rapidly slowed down almost causing a crash on I-78 in NJ. Took the car to a mercedes dealership near me and they said since the car is 2,000 miles beyond the 50,000 mile warranty it's not covered. They are replacing a series of parts that will cost me over $4,000 to repair! there is no guarantee this will even fix the problem. Is mercedes waiting for someone to die before they acknowledge this car has a very serious problem? I have to wonder if there has been any crashes involving this car and nobody survived to detail what was happening! the 2014 cla is not safe and mercedes doesn't appear to be concerned.

While driving my cla that I have only had 4 months the car turned off and said it's inoperable! I was almost hit multiple times, when dropped it of at dealer they wouldn't even give me a loan. I bought this car brand new!.

Recently, every time I MA driving in the rain, no matter how light the rain is, the traction control light comes on and a message stating"pre safe, functions limited, inoperative" shows up. The vehicle has looses acceleration. This happened to me on the freeway today. This is potentially dangerous as it could cause a serious accident. This seems to be a recurrent problem based on a simple online search.

I was driving and all of a sudden the pre safe mode popped up saying "inoperative" and "see owners manual". The check engine light came on as well as some sort of traction control light. I was nearly in a accident because the car wouldn't accelerate. When getting stopped at a red light the car would not accelerate after pushing the pedal. Then it would accelerate real fast. Luckily I was only 20 minutes from my local mercedes dealer so I called them and told them I was bringing the car directly to them. This is very scary and from seeing other complaints there must be something that needs to be addressed.

Car inability to,accelerate pre safe lights como on and check engine light come on.

The pre safe mode has happened 5 times on my cla 250 since I bought the car last January. I think the pre safe mode is not safe at all. All of a sudden, the car just lost power, no any feedback when I stepped the gas pedal, the best thing is the break still worked. After restarting the car, the car went well but the engine light was on. However, after two days, the engine light was off so I didn't even have a chance to show to the dealer. It's very dangerous to drive this car on high way, especially in traffic jam.

On October 17, 2014, vehicle 'pre safe functions limited, inoperative' light came on the vehicle while driving on interstate at approximately 50-60 mph. Vehicle would not accelerate so coasted to side of interstate and came to a stop. Tried to accelerate from a stop, car would only move at a few mph and the transmission felt like it was stuck in the highest gear. Turned car off and back on. Problem seemed to reset and was able to drive home. Did not take to dealership for this incident due to reading about others' experience and that dealerships are unable to replicate.

On September 10, 2014 and September 21, 2014, vehicle 'pre safe functions limited, inoperative' light comes on the vehicle and the vehicle loses power. Both times driving approximately 50-60 mph. First time driving on street and was able to coast home. Second time I was on major highway. . . . Very dangerous! unable to accelerate both times. Took vehicle into local dealership on September 11th, they were unable to replicate issue and returned car. Did not drive vehicle for 1 week due to travel, returned and within 2 days of driving the car, error message returned and I was unable to accelerate car. To get the car to function, must turn the vehicle off and back on and then it drive-able. Vehicle is currently back at the dealership for repair. This issue actually occurred several weeks prior but I did not report to the dealership because the light came on and quickly went back off. Also experienced slow acceleration issues when moving from a complete stop.

As I was driving on the highway around 65 miles per hour, the vehicle's check engine came up and said " inoperative, pre safe inactive" I freaked out. I was at highways speeds and it was inoperative. I noticed that the power steering was affected and the vehicle was unresponsive when I accelerated. The abs system was disabled, I was scared even to brake because I know that when the abs system is disabled the brakes can lock up and cause an accident, injuries and even death. I have noticed that many Cla250 owners have the same problem.

Traveling approximately 15mph and slowly accelerating, vehicle became completely unresponsive to throttle input, and engine remained at idle speed. Displayed showed the messages "pre-safe inoperable" and "see owner's manual. " after the engine was shut off and restarted, the car drove normally. It was taken into the dealer for inspection and repair, and was returned to me after the service adviser advised me that they could "find no codes. " the very same error occurred a few days later. This time the service adviser said that error codes were found, that there was a "conflict in the programming", that all of the hardware checked out, and that "reprogramming the module" will fix it. 36 hours later it occurred again. This time the adviser said that a Mercedes Benz service database indicated that the problem was with a wiring harness in the throttle, and that replacing that harness will fix the problem.

1st- on Feb 11th & 12th my 2014 cla which was purchased at the mb of pembroke pines had been towed to the mb of pompano, FL dealership because of the eps lights, "inoperative" warning messages that were coming up as well as the stalling and delayed acceleration, which I took photos of. It was towed to pompano form my job, my car was kept at the dealership for 4 days (as opposed to the few hrs I was told that it would take to fix the computer issues). Not only was my car in the shop for 3 days, but a part that had been ordered,which means something obviously wasn?t functioning properly so it had to be replaced. 2nd - I picked up my vehicle on sat Feb 15th from the pompano, after getting onto the i95 and driving 2 mins, the same warning signs came back up. I exited driving 15mph and trying to keep the vehicle stable. Mr. Mike rodriguez was instructed to test drive the vehicle, however, when he did so the warning signals were gone. Why? because a service guy restarted the vehicle and drove it into the service area. Being that the signal was no longer visible, the gm suggested that if there was ever a signal sent to the vehicle it would show up in some sort of reading they were able to do on the vehicle. When they returned, both the gm and mr. Rodriguez informed us that the vehicle showed them there was no signal that was sent to the vehicle all day. I litterally just saw it not 30 mins ago. We left & about 2 mins from my home in boca raton, the signal was back with vengeance! at this point I took pictures. I pulled into my drive way, but this time I left the vehicle running. 3rd -on March 2nd at around 2:45pm, after about a week of having my vehicle back, I was driving when the same warning signs and acceleration problems were back. I left it running with all the signals up and it had to be towed back. This is a summary of the incedents. This has to stop! not safe!.

I have partial video if this incident. Incident occurred at 991 odometer miles. After driving approx. ~300 mostly contiguous, flat, rural highway miles in-between Lincoln, ne and st. Louis, mo (heading to atlanta, GA) in approx. 30° weather on dry pavement, the engine stopped producing enough engine power to propel the vehicle at the 70-75 mph that I was traveling. At approx. 60-65 mph, I applied additional pressure to the gas pedal which was not effective. Pushing the gas pedal to the floor did nothing except, occasionally, the transmission would switch quickly in-between the same two gears, which registered slightly on the tachometer but did nothing to accelerate the vehicle or maintain speed. It almost felt as if the traction control was activating (but malfunctioning) despite the ground being totally dry. By approx. 50 mph I was being flanked and tailgated by two clearly disgruntled semi-trucks as I tried to pull over to the right. The vehicle seemingly would maintain a max. Of 35 mph. Upon restarting the car (normal start), letting it idle (normal idle), and then attempting to drive to a safer location, its acceleration felt restricted at lower rpms, but it did back up to highway speed and the restricted feeling ended up being temporary. The nearest dealer was mb of marion, IL. , approx. Another 200-300 miles away. On the way to this dealership, the same malfunction occurred again about 50-75 miles later. I went through the same process and restarted the vehicle. At the marion, IL dealer, the mechanic found the following code in the computer: po29921 - boost pressure of turbocharger too low. The mechanic at the marion, IL dealer and, later, at another dealer closer to where I live (mercedes of south atlanta) was not able to replicate this code and therefore no repairs have ever been attempted or made. This issue has not re-occurred here in georgia.

Today I was driving in a parking lot and approached the light to exit and my dashboard lit up with a presafe system failure, system is inoperative and my car slowed down considerably when I tried to accelerate. I pulled over and turned the engine off and then on again and the error cleared. This is very dangerous if it happens on a highway or while driving on a crowded street. I called the dealer today and was told if the error was not currently on the dash they could not do anything. I explained that this was unacceptable and they needed to look at the car. God forbid I am on the highway and it disabled. Last week my brother-in- law saw the same car disabled in the middle lane of the highway. I hope mb fixes this problem fast before someone is seriously hurt.

On Sunday, October 27, and Tuesday, October 29, 2013, my vehicle listed above had warning lights come on that stated, "pre safe, functions limited, inoperative. " in addition to the words, the esp and abs lights illuminated. I took the vehicle to penske mbz in west covina, CA, on Wednesday, October 30. They repaired the vehicle by doing a software update. On Saturday, November 2, 2013, the codes returned and I took the vehicle back to where I bought it, encino, CA, mbz. I was told they could not replicate the codes and they found no problem. This is unacceptable! the vehicle is still at encino mbz as they are trying to replicate the problem. When this malfunction occurs, the vehicle loses power and has very limited acceleration. It has occurred twice on city streets and twice on the freeway, both in eco and sport mode. On the city streets I am able to just pull to the curb. On the freeway, it becomes a possible life threatening emergency. There is only very gradual acceleration, and at 65mph, limited acceleration is very dangerous. These four occurrences have taken place in less than a 10 day period and no long term repair has yet been accomplished!.

I purchased a new new new mercedes cla-250c automobile late September 2013. In mid-October I experienced un-commanded acceleration to above 5500 rpm. This ceased just as I was about to apply braking. The car then behaved normally. On christmas night I experienced un-commanded braking whenever I backed off the accelerator pedal, the force of braking being proportional to the degree of lift-off from the accelerator. I was able to bring the car to a complete stop without touching the brake pedal. At that point I grounded the car. On January 7, 2014 I informed mercedes-benz about the above. I am prepared to provide further information regarding the above events and my correspondence with mercedes-benz USA should you desire.