Problem Lookup › Mercedes-Benz › B-Class › 2017
Car problem report
2017 Mercedes-Benz B-Class problems, recalls and owner complaints
What the 2017 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
- 20owner complaints
- 0crash reports
- 0fire reports
- 16%fail the UK MOT
20 complaints, against an average of 19 for the other 3 Mercedes-Benz B-Class 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 2017 Mercedes-Benz B-Class?
The components named most often in the 20 owner complaints. One complaint can name several, so the shares can add up to more than 100%.
What symptoms do 2017 Mercedes-Benz B-Class owners describe?
Found by reading the text of all 20 owner complaints. Tap a symptom for the answer, a real owner quote and any related recall.
Has the 2017 Mercedes-Benz B-Class been recalled?
NHTSA lists no safety recalls for the 2017 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 2017 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 behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAA bore in the universal joint on the steering shaft might not meet specifications
Risk: A bore in the universal joint on the steering shaft might not meet specifications.
Fix: Check the steering shaft on the affected vehicles and replace it if necessary.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe communication module may be deactivated
Risk: The communication module may be deactivated
Fix: Carry out a check of the configuration of the communication module on affected vehicles and if necessary activate the communication module.
UK DVSAThe emergency call system (ecall) does not meet the specification
Risk: On affected vehicles the software of the communication module for the emergency call system does not meet the specification
Fix: Update the software of the communication module for the emergency call system
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 DVSAThe software of the radar control unit may not meet specification
Risk: ; The software of the radar control unit might not meet the specification
Fix: Update the software of the radar sensor control unit on the affected vehicles.
UK DVSADoors on left vehicle side (passenger side) remain permanently locked after the vehicle has been locked/unlocked with the remote control key
Risk: Possible inability to open the left hand door externally or internally.
Fix: Replace the affected door locks on the left side of the vehicle.
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 DVSAAirbag may not deploy correctly
Risk: The propellant mixing ratio in the igniters of the front passenger airbag assembly may not meet specification. If the airbag is required and activated it might not deploy or not completely deploy. This could increase the risk of injury to the occupants.
Fix: Recall the vehicles that are likely to be affected and replace the front passenger airbag assembly.
EU Safety GateThe steering software may not correctly activate the fallback level in the event of a hardware failure.This could affect the power steering assistance and lead to the loss of steering capacity, increasing the risk of an accident.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Update of the electric steering software; Date of entry into force: Unknown; 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 GateA trapped particle may damage the sealing between the fuel rail and fuel injector, which could cause fuel to leak into the engine…A trapped particle may damage the sealing between the fuel rail and fuel injector, which could cause fuel to leak into the engine compartment. Consequently, leaking fuel may come into contact with hot parts of the engine, increasing the risk of 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 GateA bore hole in the universal joint on the steering shaft may have incorrect size.As a result, there could be play between the bearing fitted into the bore hole and the universal joint, which could cause the joint to become detached over time.This would impair the vehicle’s steerability, increasing the risk of 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 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 fixing screw connecting the base holder of the manual control device may not be correctly fitted.This can impair the control over the vehicle, increasing the risk of 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 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 mixture ratio of the fuel in the inflators of the front-passenger knee, pelvic and side curtain airbags may not be correct.In the event of an accident requiring the deployment of the airbags, this could lead to the airbags not inflating properly.
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
How often does the 2017 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 2017, 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 2017 Mercedes-Benz B-Class owners report?
12 of the 20 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.
In November 2024, the vehicle indicated "add coolant". The vehicle was brought to Mercedes Benz of Scottsdale for servicing. The dealership apparently added coolant without advising me that the B250-E has a 100% chance of failure to the Drive Unit / coolant intrusion unless a small part is replaced before coolant leaks into the inverter/entire engine. A few weeks later - the vehicle, while traveling on a highway, had a complete failure and essentially shutdown on moment's notice. It nearly caused a severe accident. Mercedes Benz USA and the MB Scottsdale dealership have refused to cover the…
On Wednesday [XXX] I was driving my electric vehicle to work. I exited the freeway and as soon as I stopped at the light for the off ramp a warning light indicator appeared stating Coolant Low. I found this odd as I was unaware of Electric Vehicles using Coolant. I clicked the OK button on the steering wheel and the message was acknowledged and disappeared from the screen. When the Light changed to green I proceeded to turn towards my office. At the next traffic light a new message popped up stating see service agent before starting your car. I again found this odd as the car was already…
While driving a notice to park the car and call for maintenance came up then while I was trying to get to safe stopping point the car went on to neutral and shut down while I was at speed. I turned the car back on and moved it to safety and called for roadside assistance
The contact owns a 2017 Mercedes-Benz B250E. The contact stated while driving approximately 60 MPH, the vehicle the lost automotive power and stalled. The message "Shut Off Immediately" was displayed. The vehicle was later towed to the residence. The cause of the failure was not yet determined. The local dealer was notified of the failure. The manufacturer was not yet contacted. The failure mileage was 72,000.
The contact owns a 2017 Mercedes-Benz B250E. The contact stated that while reversing from the garage at 3–5 MPH, the contact depressed the park button. The vehicle attempted to go into the park position. There was an abnormal noise detected. There were no warning lights illuminated. The vehicle was towed to the local dealer, where it was diagnosed that the transmission fluid needed to be replaced. The vehicle was repaired, but the failure recurred. While driving at low speeds, the vehicle went into lock mode. The vehicle was taken back to the same local dealer, where it was diagnosed that the…
My car just stalled and was not able to move on the highway exit which caused a high risk for the safety of passengers and the safety of others. The car has been towed to a Mercedes Dealer in West Covina, California. and they indicate that the coolant leaked into the drive motor and caused the car to stop. Prior to this car stall, there was no warning lamp, messages, or other symptoms of the problem prior to the failure. After the car stalls on the street, a failure message appeared asking to send the car to the shop.
At 23,596 total vehicle mileage, the electric drive motor failed while driving. This occurred two days and less than 50 miles after having an annual service performed at an authorized Mercedes Benz dealership. Failure resulted in sudden loss of power alternating with full torque power at any throttle position making the car uncontrollable and hazardous to the occupants and other cars/occupants on the road. No warning indicators, vibrations, or unusual sounds noticed prior to failure. Problem confirmed at the dealership that drive motor had failed. Drive motor produced by Tesla, with Tesla…
Speed sensor has coolant on it, indicating a leak into the motor which leads to the motor needing to be replaced.
Motor failure after 50K mile. Car can only move and stop - move and stop. Need to replace Electric Engine Motor. Seat belt malfunction after 40K.
the electric motor has suffered a coolant leak. this is a known issue in the Mercedes B250e, Rav4 EV, and Tesla Model S. This issue should be recalled and repaired.
Glad to have found this group on Facebook: https://www.facebook.com/groups/bclasselectric?sorting_setting=TOP_POSTS Here's my situation with my B-250e 2017 model with 38,000 miles. Bought from a used car dealership in California. Took it to Mercedes-Benz of South Bay. First, they had it for 2 months and could not diagnose the problem with the error messages. This is when it was still drivable. They escalated to MB USA and Germany. Finally, Germany told them what to do to remove the alert and it worked fine. I drove it for 80 miles and now the same alert came back. This time the engine would…
TL* THE CONTACT OWNS A 2017 MERCEDES-BENZ B250. WHILE DRIVING 65 MPH AND ACCELERATING, THE BRAKES WERE APPLIED BUT FAILED TO RESPOND. ADDITIONALLY, THE VEHICLE MADE AN ABNORMAL IRKING NOISE. THE VEHICLE WAS TAKEN TO A LOCAL DEALER (KEYES EUROPEAN, 5400 VAN NUYS BLVD, VAN NUYS, CA 91401), BUT THEY WERE NOT ABLE TO DUPLICATE THE FAILURE. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE ISSUE AND ADVISED THE CONTACT TO CONTINUE TO DRIVE THE VEHICLE. THE FAILURE MILEAGE WAS 1,000.
Mercedes-Benz guides on CarHooq
- Mercedes Regenerative Braking - How It WorksGuide · 11 min read
- Mercedes Brake Dust Problem - How to Remove Brake Dust from the Inside Wheel and Between Wheel NutsGuide · 13 min read
- Mercedes Sprinter Cabin Air Filter ReplacementGuide · 14 min read
- A Detailed Guide on Mercedes BlueTec CoolantGuide · 11 min read
2017 Mercedes-Benz B-Class: questions owners ask
Is the 2017 Mercedes-Benz B-Class reliable?
NHTSA data alone cannot rate reliability, but it shows what owners reported. Owners filed 20 complaints with NHTSA about the 2017 Mercedes-Benz B-Class; the most common categories were engine (11, 55%), power train (10, 50%), electrical system (8, 40%). There are no safety recalls listed for this model year.
What are the most common problems with the 2017 Mercedes-Benz B-Class?
Across 20 owner complaints filed with NHTSA, the categories mentioned most often are engine (55% of complaints), power train (50% of complaints), electrical system (40% of complaints), fuel/propulsion system (25% of complaints), seat belts (5% of complaints). One complaint can name several components.
Does the 2017 Mercedes-Benz B-Class have any recalls?
As of October 2026, NHTSA lists no safety recalls for the 2017 Mercedes-Benz B-Class. Recalls can be issued at any time, so check your VIN at nhtsa.gov/recalls.
Why does my 2017 Mercedes-Benz B-Class overheat?
5 of the 20 owner complaints NHTSA has on file for the 2017 Mercedes-Benz B-Class (25%) describe the engine overheating or coolant loss. One owner wrote: "I needed a new electric motor. It was covered by the warranty but would not be if it fails again, and it's known to happen again. This is a very common issue with the Mercedes B250E from 2014-2017. I believe this should be a recall." (NHTSA complaint 11500301, January 2023). 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.
Why does my 2017 Mercedes-Benz B-Class stall, lose power or shut off while driving?
3 of the 20 owner complaints NHTSA has on file for the 2017 Mercedes-Benz B-Class (15%) describe the engine stalling, losing power or shutting off while driving. One owner wrote: "My car just stalled and was not able to move on the highway exit which caused a high risk for the safety of passengers and the safety of others. The car has been towed to a Mercedes Dealer in West Covina, California." (NHTSA complaint 11553101, November 2023). 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 2017 only.