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What 20 owners told NHTSA about the 2017 Mercedes-benz B-class E-cell

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (20)Engine (11)Transmission & drivetrain (10)Electrical system (8)Fuel system (5)Brakes (1)Seat belts (1)Speed control (1)Suspension (1)

1 of 20 complaints match · Suspension · clear filters

Jun 5, 2022SuspensionElectrical systemEngine

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 not start. After another 3 weeks with the dealership I get this: Technician found coolant entering the electric motor assembly, specifically at the rotor position sensor. Resolving this matter takes replacing the electric motor itself. Amount to resolve takes $17, 575+tax (replaces electric machine/electric motor). Conferred with warranty manager for potential extended coverage. There is no additional or extended coverage for this component. I owe $15K on car payments so clearly, I won't be getting it repaired for $18K+. Especially when I can't trust if their diagnostic is accurate after they haven't figured it out for 3 months. Totally lost trust in the brand of Mercedes-Benz. The only remaining warranty is the Tesla battery till 100K miles. They say Tesla doesn't support it anymore. That's not my problem. Mercedes-Benz has sold this lemon of a model to many people. They owe compensation to pay for this. Customers are NOT Research & Development cost. We expect a working product. And as this group has posted -- this is a systemic issue. Any lawsuits on this or recall? There needs to be for sure.

NHTSA ODI 11467661

Working with the data? Download all 20 complaints as CSV · fetched from NHTSA July 25, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2017 Mercedes-benz B-class E-cell verdict →