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2015 Mercedes-Benz B-Class problems, recalls and owner complaints
What the 2015 Mercedes-Benz B-Class has been recalled for, how often it fails the UK MOT and what owners report, from official government data. Updated October 25, 2026.
- 0safety recalls
- 28owner complaints
- 0crash reports
- 0fire reports
- 20%fail the UK MOT
The most complained-about Mercedes-Benz B-Class year on file: 28 complaints, against an average of 16 for the other 3 model years.
Every Mercedes-Benz B-Class model year with its number of owner complaints. Pick a year to compare.
What goes wrong with the 2015 Mercedes-Benz B-Class?
The components named most often in the 28 owner complaints. One complaint can name several, so the shares can add up to more than 100%.
What symptoms do 2015 Mercedes-Benz B-Class owners describe?
Found by reading the text of all 28 owner complaints. Tap a symptom for the answer, a real owner quote and any related recall.
Has the 2015 Mercedes-Benz B-Class been recalled?
NHTSA lists no safety recalls for the 2015 Mercedes-Benz B-Class as of October 25, 2026. Recalls can be issued at any time, so check your VIN before you rely on this.
Is the 2015 Mercedes-Benz B-Class recalled in the UK or Europe?
Recalls issued by the UK's DVSA and through the EU's Safety Gate system that cover this model and build period. European models can differ from U.S. ones, and "years estimated" means the recall gave no build dates, so confirm your own car with your registration or VIN.
UK DVSAAffected vehicles have an engine control unit software that deviates from the local legal requirements
Risk: Affected vehicles have an engine control unit software that deviates from the local legal requirements.
Fix: Update the diesel engine control unit software.
UK DVSAThe calibration of the occupant classification system for the passenger seat may not meet the specification
Risk: The calibration of the occupant classification system for the passenger seat might not meet the specification.
Fix: Replace the passenger seat cushion
UK DVSAElectrical wiring in steering assembly may be insufficiently grounded
Risk: The steering column clock spring may break. This will cause warning messages to illuminate in the instrument cluster but in extreme instances it may cause the driver's airbag to deploy.
Fix: Affected vehicles will be recalled to establish sufficient grounding of the steering components
UK DVSASteering components may be insufficiently grounded
Risk: It has been determined that the steering airbag electrical components are insufficiently grounded. Failure of the steering column module clock spring could result in an inadvertent deployment of the driver airbag which may cause risk of injury to the driver and an increased risk of a potential collision.
Fix: On affected vehicles the manufacturer will fit a contact bridge to the outer race of the steering column top bearing which will provide correct grounding.
UK DVSAElectrical wiring in steering assembly may be insufficiently grounded
Risk: The steering column clock spring may break. This will cause warning messages to illuminate in the instrument cluster but in extreme instances it may cause the driver's airbag to deploy.
Fix: Affected vehicles will be recalled to establish sufficient grounding of the steering components.
UK DVSAElectrical wiring in steering assembly may be insufficiently grounded
Risk: The steering column clock spring may break. This will cause warning messages to illuminate in the instrument cluster but in extreme instances it may cause the driver's airbag to deploy.
Fix: Affected vehicles will be recalled to establish sufficient grounding of the steering components.
UK DVSAStarting current limiter may overload
Risk: Where the car incurs severe engine damage resulting in the engine failing to turn over (engine seizure) and if the driver repeatedly attempts to start the engine despite the engine not cranking the very high electrical current could lead to overheating of the starting current limiter and the potential for a fire.
Fix: Recall the vehicles that are likely to be affected and install an additional fuse in the electrical line to the starter.
UK DVSARisk of fireYears estimated
Risk: A threaded connection in the Prefuse box may not be tightened to the correct specification. This may excessive resistance and create a heat source. This could cause a fire. Additionally vibration may cause power disruption which could affect the operation of steering power assistance ABS SRS and/or instrument failure..
Fix: On affected vehicles check threaded connection and where necessary replace fuse box.
UK DVSARear bench seat may lift up from the rear in a collision & attached seat belts may not be anchored correctly
Risk: On 'B' Class models fitted with 'Easy Vario' rear seat option a bolt securing the seat bench to the body may have been omitted during production. This may allow the seat bench to lift during a frontal collision. Seat belt effectiveness may also be compromised.
Fix: On affected vehicles check for presence and tightness of retaining screws. Fit new screws where necessary and tighten all screws to specification.
UK DVSARisk of fire
Risk: The high pressure fuel lines have not been manufactured to the correct specification which over time can lead to crack formation and fuel leaking. Fuel escaping in the presence of an ignition source could lead to fire.
Fix: Recall the vehicles that are likely to be affected and replace the high pressure fuel lines.
UK DVSAVehicle may cut out
Risk: In rare cases the propulsion control unit may send an incorrect message. This may cause the electric power train to shut down. Power can be restored by the normal start sequence.
Fix: Update software on affected vehicles.
UK DVSAEngine may fail
Risk: The camshaft could break and damage the engine due to it not being manufactured to the correct specification. If the condition occurs it will lead to a sudden loss of drive thereby increasing the risk of a collision.
Fix: Recall the vehicles that are likely to be affected and replace the exhaust camshaft.
UK DVSAFront passenger airbag may not deploy
Risk: Certain fuses in the passenger's footwell may not have been fitted correctly. This may adversely affect the instrument cluster windscreen wipers and the passenger seat occupancy recognition system. In certain conditions this may cause the passenger's air bag not to deploy in an accident.
Fix: On affected vehicles check fuses and if necessary replace fuse box.
UK DVSAOil may leak
Risk: On certain diesel engines the 'O' ring may not have been produced to the correct specification. This may allow oil to leak and contaminate the environment. If excessive oil is lost engine damage may occur.
Fix: On affected vehicles replace the chain tensioner sealing ring.
EU Safety GateThe occupant classification system for the front passenger seat may not be calibrated in accordance with the specifications.Consequently, an installed child seat may be identified as a person or a small, light person as a child seat. As a result, the passenger airbag could be activated despite the presence of a child seat or the passenger airbag could fail to activate despite the presence of a person on the passenger seat, increasing the risk of injuries.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe steering column is not sufficiently earthed.As a result, in the event of an electrostatic discharge, the driver's airbag may be triggered when not required. This could cause an accident.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe starter current limiter may be overloaded and overheat.As a consequence, the surrounding components could ignite, leading to a fire.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: 01/09/2017
EU Safety GateThe back screws on the rear seats could be missing on one side.Passengers would therefore not be protected from unsecured luggage in the event of a frontal collision, because the rear seat could be lifted from behind. Furthermore, the required seat belt anchorage may not be guaranteed.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe bolt connections for the wheels on the right-hand side of the vehicle may have been fitted defectively.There is a risk of bolt connections coming loose and leading to the loss of a wheel, which would increase the risk of a potential accident.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateCracks may form in the high-pressure fuel pipes leading to a fuel leak and a vehicle fire.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateIncorrect software was installed in the Electronic Stability Programme (ESP) control device of the vehicles affected.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateOwing to the incorrect installation of fuses, various vehicle functions might fail.These include the passenger presence detector for the passenger seat, the status display for the passenger airbag, the instrument cluster and the windscreen wipers. This could lead to an accident or an increased risk of injury for the passenger in the event of an accident.
Measures: Type of economic operator taking notified measure(s): Other; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe gasket seal for the engine's chain tensioner may display incorrect settling behaviour.Over time, this may result in the chain tensioner detaching from the threaded hole on the cylinder head and the leakage of engine oil. The loss of large amounts of engine oil may contaminate the road, leading to a possible hazard for traffic following behind.
Measures: Type of economic operator taking notified measure(s): Other; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
How often does the 2015 Mercedes-Benz B-Class fail its MOT?
Why they failed: the share of failed tests with at least one fault in each area (a test can fail on several). Cars first registered in 2015, tested in Great Britain in 2023; first registration is usually, but not always, the model year. Source: DVSA anonymised MOT tests and results, Open Government Licence v3.0.
What do 2015 Mercedes-Benz B-Class owners report?
12 of the 28 complaints, the most recent for the most-reported components, as the owners wrote them. NHTSA removes names and VINs; long reports are trimmed. CarHooq has not verified individual claims.
Stacy belts will not retract they remain in a loosened state and I am afraid they will not lock in an accident
Subject: Urgent Safety Concern – Immediate Attention Required Dear To Whom it may Concern, I am writing to urgently express serious safety concerns with the vehicle I recently [purchased/test drove/had serviced]. Seat Belt Malfunction: The children’s seat belts are not retracting properly, posing a significant safety risk. Braking Issues: Despite being told the brakes are at 90%, they feel like they are grinding metal. This is highly concerning. Alignment Problem: The vehicle is veering aggressively to the right during normal driving, which indicates a serious alignment or suspension issue…
MERCEDES DEALER NOTES : 07/19/2022 CLIENT STATES STEERING IS STIFF. STARTED ABOUT 1 TO 2 MONTHS AGO AND WOULD SHOW UP ONCE AND AWHILE. WHEN IT WOULD ACT UP WOULD NOT DRIVE IT AND IT WOULD LOCK THE STEERING . THIS HAPPENED MULTIPLE TIMES, WITH ACCIDENT HAZARD. WE DID THE BELOW WORK. ELECTRIC POWER STEERING RACK FAULTY REPLACE COMPLETE ELECTRIC POWER STEERING RACK. WHICH COST US OVER $3000. NOW WE HAVE SIMILIAR PROBLEM STEERING IS TIGHT AGAIN, MAKING FLAPPING NOISE, DEALER RECOMMENDED REPLACEMENT OF POWER STEERING RACK, GEAR BOX 07/02/24 , MERCEDES HAS RECALL ON MANY MODELS DURING YEAR 2015-2018…
The electric motor was leaking coolant and needs to be replaced. I have read countless accounts that this is a known issue with this car.
Occasionally the car will lurch forward when coming to a stop. As you come to a stop it tries to propel the car forward as you are breaking and coming to a stop. Happens rarely but when it does it's a big safety concern.
Failure of seals and or bearings in the electric motor causing coolant to leak into the electric motor, creating an internal electrical fault, seizing electric motor.
The main electric drive motor will start leaking coolant which then damages the motor and even electronics. Well known issue and makes the vehicle unsafe and isn't a matter of "if" but "when" the seals will go bad and this is on our car that has less than 40k miles on the odometer.
Motor/Drive Unit making "whirring" noise that got progressively worse over time. While under warranty MB dealer stated that everything was fine, now after the warranty has expired a different dealer says it is failing and needs to be replaced. Independent shop says there is a potential design defect with the Tesla motor used in this vehicle (many early model S motors were replaced by tesla.)
THIS MB MODEL HAS AN ELECTRIC MOTOR THAT FAILS AT AROUND 35000 TO 40000 MILES, AND MAKES THE VEHICLE TO STOP SUDDENLY CAUSING SERIOUS RISKS TO THE DRIVER IF THIS HAPPENS IN ANY MAIN HIGHWAY. TWO WEEKS AGO MY WIFE WAS DRIVING NORTHBOUND AT THE FAST LANE OF THE PALMETTO EXPRESSWAY , IN MIAMI FL, WHEN THE CAR STOPPED GIVING NO TIME TO AVOID COMING TRAFFIC. FORTUNATELY ONE FDOT RANGER WAS DRIVING SAME WAY AND PROTECT MY WIFE TURNING ON ITS EMERGENCY LIGHTS WHILE THEY WAIT FOR A TOW TRUCK TO ARRIVE. THIS MODEL OF MB IS ASSEMBLED WITH A TESLA MOTOR THAT HAS BEEN PROVEN TO FAIL, BUT TESLA HAS TAKEN…
MY B-CLASS ELECTRIC HAD A SUDDEN LOSS OF POWER. HERE'S THE DETAILS: LEFT THE HOUSE IN SAN DIEGO AT 7:00 AM. OUTSIDE TEMPERATURE ABOUT 75+DEGREES. ABOUT 1 MILE FROM THE START, I BRAKED SLIGHTLY TO MAINTAIN SPEED OF ABOUT 25 MPH, COASTED TOWARDS AND UPHILL, PUT MY FOOT ON THE ACCELERATOR TO MAINTAIN SPEED AND THERE WAS NO POWER-JUST COASTING. THERE WAS NO UNUSUAL SOUND AND NO WARNING DISPLAYED. THE CAR APPEARED NORMAL EXCEPT THE GUAGE WAS SHOWING FULL REGENERATIVE BRAKING WHILE THE CAR WAS COASTING. TRANSMISSION WAS IN D-AUTO. POWER STEERING WORKED, AC AND RADIO WERE STILL ON. I BROUGHT IT TO A…
DRIVING ON THE FREEWAY AT 65MPH, EXPERIENCED COMPLETE AND SUDDEN LOSS OF DRIVE/POWER. CAR CHARGE WAS AROUND 1/2 FULL. HAD TO PULL TO THE SHOULDER AS THE CAR ROLLED TO A COMPLETE STOP. FINDING LOTS OF OTHER REPORTS ONLINE, DEALER HAS BEEN UNABLE TO DETERMINE THE ROOT CAUSE AFTER 1 WEEK. DEALER REPORTED OTHER SIMILAR INCIDENTS FROM OTHER DRIVERS.
UNEXPECTED LOSS OF POWER - WE HAVE EXPERIENCED TOTAL LOSS OF ACCELERATION AND THROTTLE POWER RESULTING IN THE VEHICLE ROLLING/DRIFTING TO A STOP. IN ORDER TO REGAIN THROTTLE POWER, THE CAR MUST BE PLACED IN PARK AND THE ENGINE START BUTTON DEPRESSED. THIS LOSS OF POWER HAS OCCURRED TO ME AT LEAST 3 TIMES AT LOW SPEEDS (10-25 MPH), ONCE AT 45 MPH AND ONCE AT 65 MPH WHILE DRIVING IN THE FAR LEFT LANE OF 73 SOUTH TOLL ROAD, CALIFORNIA. ALSO IMPORTANT IS THAT AT THE TIME FORWARD POWER IS LOST, THE REGENERATION GAUGE ON THE FAR RIGHT OF THE DASHBOARD MOVES IMMEDIATELY TO MAXIMUM INDICATION AND ALL…
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2015 Mercedes-Benz B-Class: questions owners ask
Is the 2015 Mercedes-Benz B-Class reliable?
NHTSA data alone cannot rate reliability, but it shows what owners reported. Owners filed 28 complaints with NHTSA about the 2015 Mercedes-Benz B-Class; the most common categories were power train (15, 53.6%), fuel/propulsion system (10, 35.7%), engine (8, 28.6%). There are no safety recalls listed for this model year.
What are the most common problems with the 2015 Mercedes-Benz B-Class?
Across 28 owner complaints filed with NHTSA, the categories mentioned most often are power train (53.6% of complaints), fuel/propulsion system (35.7% of complaints), engine (28.6% of complaints), vehicle speed control (21.4% of complaints), electrical system (17.9% of complaints). One complaint can name several components.
Does the 2015 Mercedes-Benz B-Class have any recalls?
As of October 2026, NHTSA lists no safety recalls for the 2015 Mercedes-Benz B-Class. Recalls can be issued at any time, so check your VIN at nhtsa.gov/recalls.
Why does my 2015 Mercedes-Benz B-Class stall, lose power or shut off while driving?
11 of the 28 owner complaints NHTSA has on file for the 2015 Mercedes-Benz B-Class (39.3%) describe the engine stalling, losing power or shutting off while driving. One owner wrote: "Car stalled while going on expressway at 30 mph. complete loss of power. had to pull over and power off the car. restart of the car after a while and everything was back to normal." (NHTSA complaint 10854506, April 2016). If it happens to your car, check your VIN for open recalls at nhtsa.gov/recalls and report the problem to NHTSA; complaints are what trigger investigations.
Check your own B-Class
Counts are a starting point, not a verdict: popular models collect more complaints because more of them are on the road, and NHTSA does not verify individual reports. To see whether a recall is still open on your car, enter your VIN at nhtsa.gov/recalls (U.S.) or your registration at check-vehicle-recalls.service.gov.uk (UK). Had a safety problem? Report it to NHTSA; complaints are what trigger investigations and recalls.
Data: NHTSA Office of Defects Investigation recall and complaint databases (public domain), DVSA anonymised MOT results (Open Government Licence v3.0), DVSA vehicle recalls (Open Government Licence v3.0), EU Safety Gate alerts (© European Union), retrieved October 25, 2026. Model year 2015 only; combines NHTSA's entries for B 250E and B-CLASS E-CELL.