Illustration2018 MERCEDES BENZ S CLASS. CONSUMER WRITES IN REGARDS TO NHTSA RECALL 18V-910. *LD *JS
2018 MERCEDES-BENZ S560
Owner reports · Recalls · Investigations
Limited comparison data
There is not enough comparable history to draw a useful model-year comparison.
About this comparison →How this year compares
Owner complaints by model year
Compare all S560 years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
Limited mileage data: 7 of 13 reports include usable mileage. There isn’t enough coverage to show a useful chart.
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
- Engine. Review the 3 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Fuel/propulsion System. Review the 2 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Service Brakes. Review the 2 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
0 crash reports1 fire reports0 injury reports
Steering complaints
2 reportsTHERE ARE 2 ACTIVE RECALLS SINCE PAST 4 MONTHS AND THERE IS NO REMEDY YET. I HAVE CONTACTED THE DEALER TO FIX THE ISSUE AND THEY ARE TELLING ME THAT THE REMEDY HAS NOT BEEN MADE YET.
Official recalls
1021V197000 · Structure:body:roof And Pillars
Mar 19, 2021
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2020 C300 Coupe, C43 Coupe AMG, C43 AMG, 2015-2020 C300, GLA250, 2016-2018 C350e, CLA45 Coupe AMG, 2015 C400, S65 AMG, 2015-2019 C63 AMG, 2016 C450, 2015-2016 GLA45 AMG, S600, 2016-2020 GLC300, 2017-2019 GLC43 AMG, GLE43 Coupe AMG, 2014-2019 CLA250 Coupe, 2014-2015 CLA45 AMG, 2018 GLC63 AMG, 2014-2017 S550, 2018-2020 S450, 2016-2019 GLE63 Coupe AMG, 2016 GLE450 Coupe, 2014-2020 S63 AMG, 2018-2019 S560, and 2019 GLC350e vehicles equipped with a panoramic sunroof. The front roof panel located between the windshield and the panoramic sunroof may not have been bonded correctly to the vehicle during a prior repair.
Consequence & remedy
Consequence: The adhesive bonding of the front panel might deteriorate, possibly causing the front panel to detach from the vehicle and become a road hazard, increasing the risk of a crash.
Remedy: Mercedes-Benz dealer will remove the bonded panel and will install a new front panel by following the detailed repair instructions and using the approved primer, cleaner and adhesive, free of charge. Owner notification letters were mailed on September 3, 2021 and October 26, 2021. Owners may contact MBUSA customer service at 1-800-367-6372.
21V072000 · Communication; Communication: Auto Crash Notification
Feb 12, 2021
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2019 C300, E300, 2018-2020 CLA250, 2020 CLS450, AMG E53, AMG GT53, GLE450, 2018 AMG E63, AMG GTA, 2017-2020 GLA250, GLC300, 2019 GLC350, AMG GLC43, 2017-2018 GLE350, 2019 AMG GLC 43, GLC350, GLE400, 2017 GLS450, S550, C300 Cabrio, and 2018-2019 S560 vehicles. On June 18, 2021, an additional 9 vehicles were added, including certain 2021 GLA250, GLC300, 2018 S450, E400, and 2017 CLA250 vehicles. The communication module might have been inadvertently deactivated during a service visit, which could have disabled the Emergency Call (eCall) function.
Consequence & remedy
Consequence: A disabled eCall system would prevent a vehicle occupant from contacting emergency services through the call center in an emergency, potentially delaying emergency responders and increasing the risk of injury.
Remedy: MBUSA will notify owners, and dealers will inspect the communication module and activate it, if necessary, free of charge. The recall began March 31, 2021. Letters for the owners of the 9 additional vehicles were mailed July 9, 2021. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2021030005.
Additional source detail variants (2)
Communication: Auto Crash Notification
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2019 C300, E300, 2018-2020 CLA250, 2020 CLS450, AMG E53, AMG GT53, GLE450, 2018 AMG E63, AMG GTA, 2017-2020 GLA250, GLC300, 2019 GLC350, AMG GLC43, 2017-2018 GLE350, 2019 AMG GLC 43, GLC350, GLE400, 2017 GLS450, S550, C300 Cabrio, and 2018-2019 S560 vehicles. On June 18, 2021, an additional 9 vehicles were added, including certain 2021 GLA250, GLC300, 2018 S450, E400, and 2017 CLA250 vehicles. The communication module might have been inadvertently deactivated during a service visit, which could have disabled the Emergency Call (eCall) function.
Consequence: A disabled eCall system would prevent a vehicle occupant from contacting emergency services through the call center in an emergency, potentially delaying emergency responders and increasing the risk of injury.
Remedy: MBUSA will notify owners, and dealers will inspect the communication module and activate it, if necessary, free of charge. The recall began March 31, 2021. Letters for the owners of the 9 additional vehicles were mailed July 9, 2021. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2021030005.
Communication
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2019 C300, E300, 2018-2020 CLA250, 2020 CLS450, AMG E53, AMG GT53, GLE450, 2018 AMG E63, AMG GTA, 2017-2020 GLA250, GLC300, 2019 GLC350, AMG GLC43, 2017-2018 GLE350, 2019 AMG GLC 43, GLC350, GLE400, 2017 GLS450, S550, C300 Cabrio, and 2018-2019 S560 vehicles. On June 18, 2021, an additional 9 vehicles were added, including certain 2021 GLA250, GLC300, 2018 S450, E400, and 2017 CLA250 vehicles. The communication module might have been inadvertently deactivated during a service visit, which could have disabled the Emergency Call (eCall) function.
Consequence: A disabled eCall system would prevent a vehicle occupant from contacting emergency services through the call center in an emergency, potentially delaying emergency responders and increasing the risk of injury.
Remedy: MBUSA will notify owners, and dealers will inspect the communication module and activate it, if necessary, free of charge. The recall began March 31, 2021. Letters for the owners of the 9 additional vehicles were mailed July 9, 2021. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2021030005.
21V058000 · Communication: Auto Crash Notification; Electrical System:software
Feb 5, 2021
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2016 - 2021 CLA-Class, GLA-Class, GLE-Class, GLS-Class, SLC-Class, A-Class, GT-Class, C-Class, E-Class, S-Class, CLS-Class, SL-Class, B-Class, GLB-Class, GLC-Class, and G-Class vehicles. Please refer to the Part 573 report for specific vehicle model details. The software design of the communication module may fail to communicate the correct vehicle location for the emergency call system (eCall) in the event of a crash.
Consequence & remedy
Consequence: Failure of the eCall system may result in emergency responders being dispatched to the wrong location, increasing the risk of injury following a crash.
Remedy: MBUSA will notify owners, and the communication module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. The recall began March 12, 2021. Owners may contact MBUSA customer service at 1-877-762-8267. MBUSA's number for this recall is 2021020025.
Additional source detail variants (2)
Communication: Auto Crash Notification
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2016 - 2021 CLA-Class, GLA-Class, GLE-Class, GLS-Class, SLC-Class, A-Class, GT-Class, C-Class, E-Class, S-Class, CLS-Class, SL-Class, B-Class, GLB-Class, GLC-Class, and G-Class vehicles. Please refer to the Part 573 report for specific vehicle model details. The software design of the communication module may fail to communicate the correct vehicle location for the emergency call system (eCall) in the event of a crash.
Consequence: Failure of the eCall system may result in emergency responders being dispatched to the wrong location, increasing the risk of injury following a crash.
Remedy: MBUSA will notify owners, and the communication module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. The recall began March 12, 2021. Owners may contact MBUSA customer service at 1-877-762-8267. MBUSA's number for this recall is 2021020025.
Electrical System:software
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2016 - 2021 CLA-Class, GLA-Class, GLE-Class, GLS-Class, SLC-Class, A-Class, GT-Class, C-Class, E-Class, S-Class, CLS-Class, SL-Class, B-Class, GLB-Class, GLC-Class, and G-Class vehicles. Please refer to the Part 573 report for specific vehicle model details. The software design of the communication module may fail to communicate the correct vehicle location for the emergency call system (eCall) in the event of a crash.
Consequence: Failure of the eCall system may result in emergency responders being dispatched to the wrong location, increasing the risk of injury following a crash.
Remedy: MBUSA will notify owners, and the communication module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. The recall began March 12, 2021. Owners may contact MBUSA customer service at 1-877-762-8267. MBUSA's number for this recall is 2021020025.
20V449000 · Electrical System:software; Seat Belts:front:warning Light/devices
Jul 31, 2020
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2019 C300, C300 Coupe, CLS450, E450 Coupe and S450, 2017-2019 E300, 2018 E400 Coupe, E400 Stationwagon, and 2018-2019 S560 vehicles that have previously had the instrument cluster replaced. The software in the replaced instrument cluster may cause the seat belt warning system to not operate properly, only displaying a solid warning light if either the driver or passenger seat belt is unfastened, instead of a blinking light with an audible tone.
Consequence & remedy
Consequence: Without the audible tone and blinking warning light to remind the front seat occupants that their seat belts are not buckled, they may forget to buckle their seat belt, increasing their risk of injury in the event of a crash.
Remedy: MBUSA will notify owners, and dealers will update the instrument cluster software, free of charge. The recall began September 8, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020080015.
Additional source detail variants (2)
Electrical System:software
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2019 C300, C300 Coupe, CLS450, E450 Coupe and S450, 2017-2019 E300, 2018 E400 Coupe, E400 Stationwagon, and 2018-2019 S560 vehicles that have previously had the instrument cluster replaced. The software in the replaced instrument cluster may cause the seat belt warning system to not operate properly, only displaying a solid warning light if either the driver or passenger seat belt is unfastened, instead of a blinking light with an audible tone.
Consequence: Without the audible tone and blinking warning light to remind the front seat occupants that their seat belts are not buckled, they may forget to buckle their seat belt, increasing their risk of injury in the event of a crash.
Remedy: MBUSA will notify owners, and dealers will update the instrument cluster software, free of charge. The recall began September 8, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020080015.
Seat Belts:front:warning Light/devices
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2019 C300, C300 Coupe, CLS450, E450 Coupe and S450, 2017-2019 E300, 2018 E400 Coupe, E400 Stationwagon, and 2018-2019 S560 vehicles that have previously had the instrument cluster replaced. The software in the replaced instrument cluster may cause the seat belt warning system to not operate properly, only displaying a solid warning light if either the driver or passenger seat belt is unfastened, instead of a blinking light with an audible tone.
Consequence: Without the audible tone and blinking warning light to remind the front seat occupants that their seat belts are not buckled, they may forget to buckle their seat belt, increasing their risk of injury in the event of a crash.
Remedy: MBUSA will notify owners, and dealers will update the instrument cluster software, free of charge. The recall began September 8, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020080015.
20V173000 · Engine
Mar 20, 2020
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018-2019 S560 and Maybach S560 vehicles equipped with 4.0L 8-cylinder gasoline-engines. Two engine oil plugs may not withstand high engine loads while driving, possibly resulting in an engine oil leak.
Consequence & remedy
Consequence: An engine oil leak can spill on to the road and cause slippery road conditions. Additionally, if the engine runs out of oil it can cause an engine stall while driving. Either of these scenarios can increase the risk of a crash.
Remedy: MBUSA will notify owners, and dealers will reinforce the engine oil plugs by adding a retaining plate, free of charge. The recall began August 11, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020060018.
19V915000 · Service Brakes, Hydraulic:foundation Components:disc; Service Brakes, Hydraulic:foundation Components:disc:caliper; Service Brakes, Hydraulic:foundation Components:disc:pads
Dec 20, 2019
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018 S560 and S450 vehicles. These vehicles may be equipped with front brake components (brake discs, calipers, and pads) with different dimensions than specified for the vehicle.
Consequence & remedy
Consequence: The incorrect size brake components may lead to the wrong replacement components fitted to the vehicle during brake repairs, possibly affecting braking performance and increasing the risk of a crash.
Remedy: MBUSA will notify owners, and dealers will replace the front brake system, free of charge. The recall began May 8, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020030020.
Additional source detail variants (3)
Service Brakes, Hydraulic:foundation Components:disc:pads
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018 S560 and S450 vehicles. These vehicles may be equipped with front brake components (brake discs, calipers, and pads) with different dimensions than specified for the vehicle.
Consequence: The incorrect size brake components may lead to the wrong replacement components fitted to the vehicle during brake repairs, possibly affecting braking performance and increasing the risk of a crash.
Remedy: MBUSA will notify owners, and dealers will replace the front brake system, free of charge. The recall began May 8, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020030020.
Service Brakes, Hydraulic:foundation Components:disc:caliper
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018 S560 and S450 vehicles. These vehicles may be equipped with front brake components (brake discs, calipers, and pads) with different dimensions than specified for the vehicle.
Consequence: The incorrect size brake components may lead to the wrong replacement components fitted to the vehicle during brake repairs, possibly affecting braking performance and increasing the risk of a crash.
Remedy: MBUSA will notify owners, and dealers will replace the front brake system, free of charge. The recall began May 8, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020030020.
Service Brakes, Hydraulic:foundation Components:disc
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018 S560 and S450 vehicles. These vehicles may be equipped with front brake components (brake discs, calipers, and pads) with different dimensions than specified for the vehicle.
Consequence: The incorrect size brake components may lead to the wrong replacement components fitted to the vehicle during brake repairs, possibly affecting braking performance and increasing the risk of a crash.
Remedy: MBUSA will notify owners, and dealers will replace the front brake system, free of charge. The recall began May 8, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020030020.
19V821000 · Engine And Engine Cooling:engine:gasoline
Nov 15, 2019
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018-2019 S560, S560 Cabriolet, and S560 4MATIC vehicles equipped with 8-cylinder gasoline engines. The threaded connection between the camshaft idler gear and the crankcase may be improperly tightened, possibly causing the idler gear to detach from the crankcase.
Consequence & remedy
Consequence: A detached idler gear can damage the engine, resulting in a stall and increasing the risk of a crash.
Remedy: MBUSA will notify owners, and dealers will replace the engine, free of charge. The recall began February 21, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020020013.
18V908000 · Lane Departure: Lane Keep: Steering Assist; Steering:electric Power Assist System
Dec 19, 2018
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018 AMG S63 4MATIC coupe, AMG S63 4MATIC sedan, AMG S63 4MATIC Cabriolet, S450 4MATIC sedan, S560 4MATIC coupe, S560 4MATIC sedan, and Maybach S560 4MATIC vehicles. Due to an incorrect steering boot installation, the Active Steering Assist system may remain engaged despite the driver's hands not being on the steering wheel for a prolonged period of time.
Consequence & remedy
Consequence: If the system remains active despite the driver not having their hands on the wheel, the driver's inattention may increase the risk of crash.
Remedy: MBUSA has notified owners, and dealers will inspect the vehicles and correct the steering boot installation, as necessary, free of charge. The recall began May 13, 2019. Owners may contact Mercedes Benz customer service at 1-800-367-6372. MBUSA's number for this recall is 2019040025.
Additional source detail variants (2)
Lane Departure: Lane Keep: Steering Assist
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018 AMG S63 4MATIC coupe, AMG S63 4MATIC sedan, AMG S63 4MATIC Cabriolet, S450 4MATIC sedan, S560 4MATIC coupe, S560 4MATIC sedan, and Maybach S560 4MATIC vehicles. Due to an incorrect steering boot installation, the Active Steering Assist system may remain engaged despite the driver's hands not being on the steering wheel for a prolonged period of time.
Consequence: If the system remains active despite the driver not having their hands on the wheel, the driver's inattention may increase the risk of crash.
Remedy: MBUSA has notified owners, and dealers will inspect the vehicles and correct the steering boot installation, as necessary, free of charge. The recall began May 13, 2019. Owners may contact Mercedes Benz customer service at 1-800-367-6372. MBUSA's number for this recall is 2019040025.
Steering:electric Power Assist System
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018 AMG S63 4MATIC coupe, AMG S63 4MATIC sedan, AMG S63 4MATIC Cabriolet, S450 4MATIC sedan, S560 4MATIC coupe, S560 4MATIC sedan, and Maybach S560 4MATIC vehicles. Due to an incorrect steering boot installation, the Active Steering Assist system may remain engaged despite the driver's hands not being on the steering wheel for a prolonged period of time.
Consequence: If the system remains active despite the driver not having their hands on the wheel, the driver's inattention may increase the risk of crash.
Remedy: MBUSA has notified owners, and dealers will inspect the vehicles and correct the steering boot installation, as necessary, free of charge. The recall began May 13, 2019. Owners may contact Mercedes Benz customer service at 1-800-367-6372. MBUSA's number for this recall is 2019040025.
18V910000 · Lane Departure: Lane Keep: Automatic Steering; Lane Departure: Lane Keep: Steering Assist; Steering:electric Power Assist System
Dec 19, 2018
Mercedes-Benz USA, LLC. (Mercedes) is recalling certain 2018 S450 4MATIC, S560 4MATIC Coupe, S63 AMG 4MATIC Coupe, Maybach S560 4MATIC, S560 4MATIC, S63 AMG and S63 AMG 4MATIC Cabrio vehicles. The Hands-off-Detection system may malfunction, causing the Active Steering Assist system to remain engaged despite the driver's hands not being on the steering wheel for a prolonged period of time.
Consequence & remedy
Consequence: If the system remains active despite the driver not having their hands on the wheel, the driver's inattention may increase the risk of crash.
Remedy: Mercedes has notified owners, and dealers will update the software of the steering control unit, free of charge. The recall began May 13, 2019. Owners may contact Mercedes customer service at 1-800-367-6372. MBUSA's number for this recall is 2019040024.
Additional source detail variants (3)
Lane Departure: Lane Keep: Steering Assist
Mercedes-Benz USA, LLC. (Mercedes) is recalling certain 2018 S450 4MATIC, S560 4MATIC Coupe, S63 AMG 4MATIC Coupe, Maybach S560 4MATIC, S560 4MATIC, S63 AMG and S63 AMG 4MATIC Cabrio vehicles. The Hands-off-Detection system may malfunction, causing the Active Steering Assist system to remain engaged despite the driver's hands not being on the steering wheel for a prolonged period of time.
Consequence: If the system remains active despite the driver not having their hands on the wheel, the driver's inattention may increase the risk of crash.
Remedy: Mercedes has notified owners, and dealers will update the software of the steering control unit, free of charge. The recall began May 13, 2019. Owners may contact Mercedes customer service at 1-800-367-6372. MBUSA's number for this recall is 2019040024.
Lane Departure: Lane Keep: Automatic Steering
Mercedes-Benz USA, LLC. (Mercedes) is recalling certain 2018 S450 4MATIC, S560 4MATIC Coupe, S63 AMG 4MATIC Coupe, Maybach S560 4MATIC, S560 4MATIC, S63 AMG and S63 AMG 4MATIC Cabrio vehicles. The Hands-off-Detection system may malfunction, causing the Active Steering Assist system to remain engaged despite the driver's hands not being on the steering wheel for a prolonged period of time.
Consequence: If the system remains active despite the driver not having their hands on the wheel, the driver's inattention may increase the risk of crash.
Remedy: Mercedes has notified owners, and dealers will update the software of the steering control unit, free of charge. The recall began May 13, 2019. Owners may contact Mercedes customer service at 1-800-367-6372. MBUSA's number for this recall is 2019040024.
Steering:electric Power Assist System
Mercedes-Benz USA, LLC. (Mercedes) is recalling certain 2018 S450 4MATIC, S560 4MATIC Coupe, S63 AMG 4MATIC Coupe, Maybach S560 4MATIC, S560 4MATIC, S63 AMG and S63 AMG 4MATIC Cabrio vehicles. The Hands-off-Detection system may malfunction, causing the Active Steering Assist system to remain engaged despite the driver's hands not being on the steering wheel for a prolonged period of time.
Consequence: If the system remains active despite the driver not having their hands on the wheel, the driver's inattention may increase the risk of crash.
Remedy: Mercedes has notified owners, and dealers will update the software of the steering control unit, free of charge. The recall began May 13, 2019. Owners may contact Mercedes customer service at 1-800-367-6372. MBUSA's number for this recall is 2019040024.
18V407000 · Electrical System
Jun 15, 2018
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018 Mercedes-Maybach S560 and S560 4Matic and Mercedes S450 4Matic, S450, S560, S560 4Matic, and S560 Coupe 4Matic vehicles. The electrical power bars inside the pre-fuse box in the trunk may not have been secured properly.
Consequence & remedy
Consequence: If the power bars are not properly secured, it can cause higher electrical resistance increasing the risk of a fire. Additionally, an intermittent contact between the power bars could lead to a loss of vehicle functions. The engine operation, the seat belt functions and the instrument cluster could be impaired, increasing the risk of a crash and injuries.
Remedy: MBUSA will notify owners, and dealers will inspect the pre-fuse box, replacing it as necessary, free of charge. The recall began August 30, 2018. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2018080001.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
1PE21001 · Front Roof Panel Detachment
Opened Jan 8, 2021 · Closed Oct 14, 2021
Status: closed (inferred from source dates) · Structure:body:roof And Pillars
On January 8, 2021, after ongoing review with Mercedes Benz, the National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation (ODI) opened PE21-001 to assess allegations of front roof panel detachments while driving at highway speeds in certain 2015 Mercedes-Benz (Mercedes) C-Class vehicles.The subject front roof panel is a stationary panel composed of polycarbonate and is attached to the vehicle via adhesive at the time of manufacture. The panel is found on subject vehicles equipped with panoramic sunroofs. Over time, the subject panels may exhibit cosmetic degradation leading to replacement of the panel, a procedure which entails: removal of the old panel and adhesive, site preparation, and installation of a replacement panel with new adhesive.The consumer complaints that prompted the opening of PE21-001 all described detachments of front roof panels that had been replaced after the vehicle was put into service.Mercedes' internal investigation identified a broader scope of affected vehicles (2014-2020 CLA, GLA, C, S, GLC, and GLE class) and found the following potential service procedure- related causes of front roof panel detachments:- Improper surface pretreatments such as the use of the wrong primer or cleaner or scoring of the surface; or - Use of the incorrect adhesive.These conditions lead to a front roof panel bond that, even if sound at the time of repair, cannot maintain its strength over time and environmental exposure.Mercedes updated its service and parts ordering systems to reinforce the proper use of specified kits and procedures via webinars, shop foreman meetings, and explicit reference to the risks incurred by diverging from the repair procedures. Mercedes is also furnishing parts ordering assistance, and will hold dealerships accountable for improper repairs.ODI's analysis of the ten complaints it has received from the public (VOQ's) and MBUSA's complaint data submitted in response to the information request letter for PE21-001 identified a total of 57 non-duplicative reports alleging incidents in which the front roof panel detached from the vehicle while in motion. Included within the 57 reports are incidents where consumers state the panel detached ...and flew off into traffic.On March 19, 2021, Mercedes notified NHTSA that it would recall subject vehicles with front roof panels known to have been replaced after the original sale of the vehicle. In total, the recall (designated as Recall 21V197) covers 15,099 vehicles that were ever registered in the United States. Based on Recall 21V197 and the remedy implemented by Mercedes, further investigation does not appear to be warranted at this time.Accordingly, this investigation is closed.The ODI complaints cited above can be viewed at www.nhtsa.gov under the following ODI identification numbers: 11376425, 11352686, 11351629, 11349158, 11341541, 11337594, 11324100, 11311591, 11222127, 11404183