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Mercedes-Benz seat belt buckles may falsely read as unfastened

NHTSA campaign 19V788000 · Reported 2019-11-01 · Mercedes-Benz USA, LLC.

high How serious is it? About this label

The electric PRE-SAFE®-function and the seat belt pretensioners may not deploy during a crash, increasing the risk of injury. The notice does not tell owners to stop driving.

What's wrong, in plain English

On these Mercedes-Benz models, the front seat belt buckle can wrongly tell the car that a belt is unbuckled even when it is properly latched. When that happens, the car shuts off two crash protections: the system that tightens the belt the instant a crash starts, and the feature that prepares the car and occupants just before an impact. The belt still holds you, but that extra protection is missing. Dealers check the front buckles and replace them if needed.

What you should do

1. Check your VIN at nhtsa.gov/recalls to see if your vehicle is covered.
2. Contact a Mercedes-Benz dealer, or MBUSA at 1-800-367-6372, and reference recall 2020020017.
3. Have the front seat belt buckles inspected and replaced if needed — there is no charge.

Affected vehicles (1)

Who to contact

Mercedes-Benz — official Mercedes-Benz recall lookup

Customer service: 1-800-367-6372

Any franchised dealer for the brand can do the repair. Phone numbers are taken from manufacturer sites and recent NHTSA notices; if one has changed, the number in your own recall letter is the one to use.

The bigger picture

Official notice

Component
SEAT BELTS
Summary
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018 E400 Wagon 4MATIC, E400 4MATIC, E43 AMG 4MATIC, 2018-2019 E63S AMG 4MATIC Wagon, E63 AMG 4MATIC Wagon, E300, E300 4MATIC, GLC63S Coupe AMG 4MATIC, 2019 CLS450, CLS450 4MATIC, CLS53 AMG 4MATIC, E450 Wagon, E53 AMG 4MATIC, GLC300, GLC63 AMG Coupe 4MATIC, G550 4MATIC, G63 AMG, GLC300 Coupe 4MATIC, GLC300 4MATIC, GLC350e 4MATIC, GLC43 AMG Coupe 4MATIC, GLC43 AMG 4MATIC, GLC63 AMG 4MATIC, GT63 AMG four-door 4MATIC, and GT63S AMG four-door 4MATIC vehicles. Although correctly fastened, the front seat belts may be inaccurately detected as being unfastened, which may cause the electric PRE-SAFE®-function and the pretensioner to be deactivated.
Safety risk
The electric PRE-SAFE®-function and the seat belt pretensioners may not deploy during a crash, increasing the risk of injury.
Remedy
MBUSA will notify owners, and dealers will inspect the front seat belt buckles, replacing them as necessary, free of charge. The recall began March 13, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020020017.

Verify your specific vehicle by VIN at nhtsa.gov. Recall repairs are free of charge by law.