2014 Mercedes-Benz CLA250: engine stalls while driving

Filed Nov 17, 2025 · Engine · PA

I own a 2014 Mercedes-Benz CLA 250 with the 2.0L turbocharged 4-cylinder M270 engine. The check-engine light came on and an OBD-II scan showed fault code P052E / P052E71, which indicates that the valve for crankcase ventilation (PCV / crankcase ventilation valve integrated into the valve cover) has a malfunction and the actuator is blocked. The vehicle is available for inspection and, if the repair is performed, the failed part can be retained. This appears to be the same failure that has been documented by other owners and by Mercedes-Benz on the related M274 engine used in other models (same 2.0L turbo engine family and PCV / crankcase ventilation design, but in a longitudinal layout). For those vehicles, Mercedes has issued technical service bulletins and extended emissions-related warranty coverage for the crankcase ventilation / PCV system, but vehicles like my CLA with the M270 engine are excluded even though they show the same DTCs and failure. In my case, the problem has so far shown up as a check-engine light and stored fault codes, without obvious drivability symptoms yet. However, a blocked or failed crankcase ventilation valve can increase crankcase pressure, cause oil leaks, fuel vapor or oil smells, and potential turbocharger or drivability issues, which may create a safety risk if the problem worsens (loss of power or stalling). The problem has been reproduced multiple times with different OBD-II scan tools. I contacted Mercedes-Benz and was told there are no recalls or warranty coverage for this issue on my vehicle.

Filed Sep 26, 2024 · Electrical, Engine · 76,850 miles · OK

The contact owns a 2014 Mercedes-Benz CLA250. The contact stated while driving at approximately 70 MPH, the vehicle stalled. The contact stated that when the vehicle stalled, an audible chime sounded, and the air bag warning light illuminated, and a RED triangle symbol flashed on the instrument panel. The contact stated that the instrument cluster went blank, and the vehicle lost power steering assist. Additionally, the brake pedal was very difficult to depress. The contact was able to restart the vehicle after several attempts, and the vehicle returned to normal functionality. The contact stated that the failure reoccurred. The contact drove the vehicle to a dealer who diagnosed the vehicle and determined that the battery needed to be replaced. The vehicle was repaired. The contact stated that the failure reoccurred and the vehicle had not taken back to the dealer. The manufacturer was not informed of the failure. The failure mileage was 76,850.

Filed Dec 23, 2020 · Driver assistance, Engine · 59,000 miles · CA

While driving out of a driveway, a car pulled near my car. At that time, the car was stationary. My wife heard the pre-collision warning. The the car completely shutoff or stalled. Turned off the car completely by turning the key. Then turned the car back on. Lucky there was no accident.

Filed Jul 20, 2020 · Engine, Fuel system · 40,300 miles · NY · crash · 1 injury

On this day, I was nearly killed in my 2014 mercedes cla250 4matic that stalled on a highway in new york city. The car has roughly 40,300 miles on the odometer. I was driving on the brooklyn queens expressway at 4:00am. The car's motor stalled and the car came to a stop in the left lane. There were no shoulders. I attempted to get the car restarted but all I got were flashing dashboard lights. I attempted to put up a warning triangle to the rear of the car, but the traffic was moving too quickly for me to safely do that. I sat in my car and buckled my seat belt. I called 911 to announce my emergency and I contacted my car's insurer for a tow truck (they provide such a service). Within moments, a toyota with tlc plates smashed into my car sending me into the barrier. The rear of the car was broken and deformed. The front of the car is okay, but the appearance of the rear is such that I believe I lost my car. I read online that this model has a stalling problem and that others have gone through this. I was one of the unlucky owners and I will be suing. This car's airbags did not deploy and I am injured and being treated in a hospital.

Filed Mar 4, 2020 · Engine · 60,000 miles · CA

Tl* the contact owns a 2014 mercedes benz cla250. The contact stated that while at a stop light, the vehicle stalled without warning. The vehicle was restarted and was driven to the residence. The contact stated the vehicle was later taken to mercedes-benz of encino dealer, (16721 ventura blvd, encino, ca 91436) where it was diagnosed, and the conductor coil was replaced however, the failure recurred. The vehicle was taken back to the same dealer however, technician could not find a failure. The contact was informed by the technician to drive the vehicle with the echo off. The vehicle was driven with the echo on and the failure recurred. The contact call the same dealer and schedule an appointment. The manufacturer was notified of the failure but did not assist. The approximate failure mileage was approximately 60,000.

Filed Jan 31, 2020 · Engine · 14,000 miles · DC

Tl* the contact owns a 2014 mercedes benz cla250. The contact stated while driving 25 MPH, the vehicle shut off. The contact stated the auxiliary battery light illuminated before the vehicle shut off. The contact stated the vehicle was towed to the dealer (mercedes-benz of alexandria: 200 s pickett st, alexandria, va 22304) and repaired the conductor plate which caused the vehicle to stall and shut off. The manufacturer was notified of the failure. The approximate failure mileage was 14,000.

Filed Jan 23, 2020 · Driver assistance, Electrical · TX

Cars eco button fuses . Electrical fuse . Car stalls doesn't drive well since I bought it from mercedes dealership

Filed Feb 27, 2017 · Electrical · 57,000 miles · NY

Tl* the contact owns a 2014 mercedes benz cla250. The contact stated that while driving at approximately 55 MPH, the entire instrument panel illuminated and the vehicle stalled. The vehicle restarted after one attempt however, the failure recurred. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was 57,000.

Filed May 23, 2016 · Acceleration, Electrical · 24,000 miles · NY

Tl* the contact owns a 2014 mercedes-benz cla250. While driving at various speeds, the inoperable pre-safe warning light illuminated and the vehicle began to stall. The failure was persistent. While the accelerator pedal was depressed, the vehicle failed to accelerate. The vehicle was able to restart. The vehicle was taken to a dealer where it was diagnosed that the pins failed and needed to be replaced. The vehicle was not repaired. The manufacturer was notified. The failure mileage was approximately 24,000. The VIN was not available.

Filed Mar 21, 2016 · Acceleration · 49,200 miles · IL

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.

Filed Jan 6, 2016 · Engine · 20,500 miles · TX

On multiple occasions, the vehicle will shut off while driving. The message states "pre-safe functions limited". When the car shuts off for no apparent reason, I have to coast to the side of the road to safety. I have turn the vehicle off and then I will be able to restart the engine. I've already taken this into my mercedes dealership and they did not fix the issue. I'm afraid this is going to cause a fatal accident and I have two small children. Please make this a high priority

Filed Sep 21, 2015 · Engine · 25,000 miles · CA

Tl* the contact owns a 2014 mercedes benz cla250. While driving at approximately 65 MPH, the vehicle stalled and the engine warning light illuminated. The contact was able to restart the vehicle on the first attempt. The failure recurred intermittently. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 25,000.