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2017 Mercedes-Benz C300 seat belts problems

21 complaints (10% of all complaints for this car). Typical mileage when it fails: 20,000. 2 crashes reported.

owner complaints
21
of this car's complaints
10%
typical mileage
20,000
crashes
2
recalls
2

Which part fails

  • Front: retractor
    2
  • Pretensioner
    1
  • Critical fasteners
    1

At what mileage

Complaints by mileage at the time of the problem.

0k-25k
25k-50k
50k-75k
75k-100k
100k-125k
125k-150k
150k-175k
175k-200k
200k+

Mercedes-Benz C300 seat belts problems in other years

2010201120122013201520162017201820192022

Specific symptoms reported on the 2017 Mercedes-Benz C300 seat belts

Phrases found in the owners' own descriptions, so one complaint can mention several symptoms.

Seat belt 14

Related recalls

Seat belts: front: retractorReported January 29, 2021 · 24,550 vehicles affected
What is wrong
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2021 C300, 2017-2020 AMG C43, and AMG C63 vehicles. The front seat belts might not fully retract to their stowed position. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 208, "Occupant Crash Protection."
Risk
If the seat belt does not fully retract, the occupant may find the operation of the seat belt inconvenient and not wear it, increasing the risk of injury in the event of a crash.
Remedy
MBUSA will notify owners, and dealers will check the retraction function of the front seat belts and adjust the damping foam within the B-pillars, as necessary, free of charge. The recall began February 26, 2021. Owners may contact MBUSA customer service at 1‑800‑367‑6372. MBUSA's number for this recall is 2021020010.

Recall number 21V032000 · Recall details

Seat belts: pretensionerReported April 11, 2017 · 12,743 vehicles affected
What is wrong
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017 C300, C300 4Matic, C300 Coupe, C300 Coupe 4Matic, C43 AMG, C43 AMG Coupe, C43 AMG Cabrio, C63 AMG, C63 AMG Coupe, C63S AMG, C63S AMG Coupe, C63S Cabrio, GLC300, GLC300 4Matic, GLC43 AMG, S550, S550 4Matic, S550e, S600, S63 AMG 4Matic, S65, Mercedes-Maybach S550 4Matic, and Mercedes-Maybach S600 vehicles. The affected vehicles have front seat seatbelt pretensioners that may not function properly in the event of a crash. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 208, "Occupant Crash Protection," and 209, "Seat Belt Assemblies."
Risk
If the front seat seatbelt pretensioners do not function properly, the seat occupants may not be adequately restrained in the event of a crash, increasing the risk of injury.
Remedy
MBUSA will notify owners, and dealers will replace the front seat belts, free of charge. The recall began October 13, 2017. Owners may contact MBUSA customer service at 1‑800‑367‑6372.

Recall number 17V251000 · Recall details

What 2017 Mercedes-Benz C300 owners say

Most recent owner complaints, unedited.

Filed Dec 2, 2025 · Seat belts · IN

any action on Case 11699173 ?

Filed Nov 23, 2025 · Seat belts · IN

Case already called in 11699173 - Stuck Seatbelt in B Pillar of 2017 Mercedes Benz 2 door hard top coupe. Seat belt will not come out of A pillar rendering seatbelt totally inoperable This VIN comes up negative under recall 21V03200 Case filed with MBUSA 18991593 still unresolved. Dealership is claiming a $2,200 Seatbelt Assembly is needed. now warning lights. The seatbelt was " lazy " and didn't smoothly retract prior to this incident when parked, door closed, the belt retracted with a loud motorized noise and now will not retract at all from A Pillar - Please follow up with on this Case # already called in over a week ago

Filed Nov 13, 2025 · Seat belts · 67,000 miles · IN

The contact owns a 2017 Mercedes-Benz C300. The contact stated that upon arriving at his destination and exiting the vehicle, the driver’s side seat belt retracted and became stuck in the retracted position. As a result, the contact was unable to use the driver's side seat belt. No warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the seat belt assembly. The vehicle was not repaired. After investigating the failure, the contact related the failure to the federal safety agency Campaign Number: 21V032000 (Seat Belts), but the VIN was not included. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the federal safety agency Hotline for assistance. The failure mileage was 67,000.

Filed Jun 12, 2025 · Seat belts · NY

The contact owns a 2017 Mercedes-Benz C300. The contact stated that both the front driver’s side seat belt and front passenger's side seat belt had failed to retract as needed. There was no warning light illuminated. Additionally, the contact stated that the seat belts buckles would unintendedly lodge under the seats. The vehicle was taken to the local dealer, but was not diagnosed or repaired. The contact related the failure to the federal safety agency Campaign Number: 21V032000(Seat Belts); however, the VIN was not included. The manufacturer was notified of the failure and referred the contact to the federal safety agency Hotline for assistance. The failure mileage was unknown.Â

Filed Nov 10, 2024 · Fuel system, Seat belts · MA

small to much gas inside the cab and outside and bouth seatbelt doosent work corectly

Filed Jul 10, 2024 · Seat belts · NJ

Part 573 Safety Recall Report 21V‑032 Manufacturer Name : Mercedes-Benz USA, LLC the federal safety agency Recall No. : Manufacturer Recall No. : JAN 29, 2021 21V‑032 NR Manufacturer Information : Manufacturer Name : Address : Mercedes-Benz USA, LLC Company phone : 1‑877‑496‑3691 13470 International Parkway Jacksonville FL 32218 Population : Number of potentially involved : Estimated percentage with defect : Vehicle Information : Vehicle 1 : 2017-2021 Mercedes-Benz C300 Vehicle Type : LIGHT VEHICLES Body Style : Descriptive Information : Power Train : GAS 2-DOOR Production Dates : Mercedes-Benz MY2017-2021 C300 18,589 vehicles. The recall population was determined through production JAN 19, 2016 - JUL 17, 2020 records. I was told this was not under recall when I found it is. The seat belt won’t retract. Please advise.

Filed May 30, 2024 · Seat belts · 48,956 miles · NH

The contact owns a 2017 Mercedes-Benz C300. The contact stated that while operating the vehicle, the front driver’s and front passenger’s side seat belts malfunctioned and failed to properly retract. The cause of the failure was not yet determined. The local dealer and manufacturer were notified of the failure, but no assistance was provided. The contact was informed that the vehicle was previously serviced under the federal safety agency Campaign Number: 21V032000 (Seat Belts). The contact stated that the vehicle had experienced the failure listed in the recall. The failure mileage was 48,956.

Filed May 14, 2024 · Airbags, Seat belts · CA · crash · 1 injury

The contact owns a 2017 Mercedes Benz C300. The contact stated that while making a left turn at 40 MPH, another vehicle crashed into the front passenger side of the vehicle. The air bags did not deploy upon impact and the seat belt also failed to restrain the contact during the crash. Due to both failures, the contact's head and chest hit the steering wheel. The contact was taken to the hospital by ambulance and given an X-ray exam. The contact was treated for lacerations to the forehead and suffered pain to the head, neck, back, and chest. The whereabouts of the other driver were unknown. A police report was filed. The vehicle was initially towed to an independent mechanic and later back to the contact's home where it remained in the contact's possession. Neither the dealer nor the manufacturer were notified of the failure. The vehicle was not repaired. The failure mileage was unknown.

Filed Mar 6, 2024 · Engine, Seat belts · 34,000 miles · CA

The contact owns a 2017 Mercedes-Benz C300. The contact had received notification of the federal safety agency Campaign Number: 21V032000 (Seat Belts). The vehicle was taken to a local dealer and the recall repair was performed; however, upon retrieving the vehicle, the check engine warning light illuminated upon starting the vehicle. The vehicle was taken back to the dealer and remained in the dealer possession. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 34,000.

Filed Oct 30, 2023 · Seat belts · 8,000 miles · NJ

The contact owns a 2017 Mercedes-Benz C300. The contact stated while the vehicle was parked in the driveway, the driver’s side seat belt failed to retract as designed. The contact stated that the seat belt was loose. There was no warning light illuminated. The vehicle was taken to the dealer to be diagnosed, but the vehicle was not yet diagnosed. The vehicle had not been repaired. The manufacturer was not made aware of the failure. The contact referenced the federal safety agency Campaign Number: 21V032000 (Seat Belts) as a possible cause for the failure. The failure mileage was approximately 8,000.

Questions about the 2017 Mercedes-Benz C300 seat belts

Does the 2017 Mercedes-Benz C300 have seat belts problems?

Owners have filed 21 complaints about the seat belts of the 2017 Mercedes-Benz C300, 10% of all its complaints.

At what mileage do 2017 Mercedes-Benz C300 seat belts problems start?

The typical (median) mileage in owner complaints is 20,000 miles.

Was there a recall on the 2017 Mercedes-Benz C300 seat belts?

Yes, 2 recalls: 21V032000, 17V251000. Check your VIN to see if your car still needs the free repair.

Other 2017 Mercedes-Benz C300 problems

Engine 79Fuel system 33Electrical 31Body 24Airbags 15Steering 13Transmission 12Visibility 9Driver assistance 4Acceleration 2Brakes 2Suspension 2Tires 2

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