2020 Mercedes-Benz AMG C43

Car stops accelerating and shifts into neutral without warning I nearly got hit from behind. I have consulted several other Mercedes vehicle owners and all had the same issue. Two of the other owners stated that this happened on the interstate and was very lucky they were not involved in a collision. Both vehicles were GLC 300. Mercedes does not seem to have an answer to the issue and all previous owners traded vehicles for fear of dying.

NHTSA ID

11729030

Incident

Apr 3, 2026

Uneven wear pattern.The wear often occurs on inner shoulder of the tires 5k to9k miles,which can be dangerous tire can wear down to belts on inside edge while the outer tread still looks fine. i have brought this to dealership multiple time with NO FIX but to sale me new tires and alignments.I have spoke to multiple owners of 2020 mercedes c63 and they have the same problem. This is a safety issue and has left my wife and kids on the side of freeway broken down.

NHTSA ID

11697729

Incident

Mar 19, 2025

On Tuesday, June 24th, 2025, the glass panel located between the windshield and sunroof on my 2020 Mercedes-Benz C43 AMG unexpectedly detached and flew off while driving. This posed a serious safety risk to me and others on the road. There were no prior warning lights, messages, or symptoms before the failure occurred. This appears to have resulted from heat stress weakening the bonding that secures the panel to the vehicle—an issue consistent with NHTSA Recall 23V854000. That recall covers my exact year, make, and model, yet my specific VIN has not been included for reasons unknown, despite experiencing the exact same failure described in the recall notice. The issue was confirmed by Mercedes-Benz of Boston, where my vehicle is currently located. The failed component is available for inspection upon request. The dealer quoted me approximately $2,200 for repairs but declined to cover the cost under warranty since my VIN is not part of the active recall. I have opened a case with Mercedes-Benz Corporate to request full or partial reimbursement, and I am reporting this to NHTSA so that my VIN may be considered for inclusion in the recall.

NHTSA ID

11669230

Incident

Jun 24, 2025

I was driving on the highway, with no other cars near me and my panoramic sunroof exploded. It made a very loud gunshot like sound and I felt shards of glass fall on my head while driving. I had 2 other passengers In the car. One in the passenger set and one in the rear passenger side seat. They both had glass hit them in the face on head and go inside their clothes. I was extremely startled thinking that someone had shot at us or something and had to quickly take a highway exit to pull over and see what happened. Apparently this is a common thing with Mercedes as there is a class action lawsuit relating to this issue.

NHTSA ID

11622207

Incident

Oct 27, 2024

The car will randomly go into a neutral condition while driving the car. This occurs about once per month, sometimes more often. I will come to a stop for a light or stop sign, upon green light I release the brakes and then gas only to find the engine free revving and the car will not move. I must place the car in Park and then Drive again in order for it to move forward. I have brought this up with Mercedes multiple times and eventually had the transmission replaced. 2 days later, the same thing happened. They do not have a repair available and are dragging their feet to fix. There is a systemic defect in the 9G tiptronic transmission. There are other reports of this transmission going into a "neutral" condition. With the C43 being a relatively lower production class in the C class lineup, I suspect the issue has not made the attention that a higher production vehicle would. I have video with the car 'in gear' and not able to move. And video evidence of the of the transmission glitch.

NHTSA ID

11533418

Incident

Jul 9, 2023

This has happened a couple of times to me so far. I have been driving down the road (today it was the highway) and my car fell out of gear into neutral and would not go back into gear unless I restarted the car. Every time it has happened, I have had to coast it to a safe spot to restart the car to get it back into gear. Not having power and needing to coast it to safety is a risk to others because I have no control to get myself to safety in some situations. No dealer has been able to reproduce it because of how infrequently it happens. It has happened 3 or 4 times in the last 15k miles. There were no warning messages or indications that it happened or was going to happen and no parts have been inspected. It is really scary when it happens and I hope it dosen't happen to anyone else.

NHTSA ID

11527655

Incident

Jun 19, 2023

The contact owns a 2020 Mercedes-Benz AMG C43. The contact stated while driving 65 MPH, the tire pressure warning light illuminated. The contact took the vehicle to a tire center and was informed that the front passenger’s side rim cracked, causing the tire to deflate. The tire center repaired the original rim. The failure recurred with the rear driver’s and rear passenger’s side rims. The contact stated that the wheels were the original wheels on the vehicle. The vehicle was not diagnosed after the most recent failure. A dealer was not contacted. The manufacturer had not been informed of the failure. The failure mileage was unknown.

NHTSA ID

11522258

Incident

Oct 1, 2020

The contact owns a 2020 Mercedes-Benz AMG C43. The contact received notification of NHTSA Campaign Number: 22V232000 (Back Over Prevention) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the issue. The manufacturer was made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect.

NHTSA ID

11516496

Incident

Apr 11, 2023

Complaint During part of the steering movement, it feels heavier or more difficult to steer in the same spot every time. OR Rattling, humming, dry sliding/gravel noise from the electric steering system when steering (see attachment). Complaint does not impact the ability to safely steer or control the vehicle. Cause Ball screw drive (KGT) of electric steering damaged by: 1. External force due to: ‑ Hitting the curb/posts with the front wheels. ‑ Driving over obstacles (e.g. pothole/ threshold/ speed bump/ gully) at an inappropriate speed. 2. Corrosion/ water ingress through a damaged boot (see attachment). ‑ Cracks (1) ‑ High pressure cleaner (2) ‑ Animal bite (3) See various examples listed in the attachments for examples of outside influence. Remedy Remove boot clamps closest to steering gear housing on both left and right (as seen in "Steering Rack Boot Clamp Location"). Pull back boot and inspect for rust, broken end stops, water, or any other anomalies. Replace electric steering. Note: Steering gears replaced due to outside influence or damage must not be claimed under warranty!

Complaint • Harsh 1‑2, 2‑3, and/or 3‑4 shift • Jerky shifting • Jolting when accelerating from stop Cause Insufficient software application causing elevated K81/K27/B05 fill time adaptations and elevated torque adaptations for concerning shift. Note: Shift quality in E Performance models can be affected if the HV Battery state of charge (SOC) reaches 25% or below. Remedy Check VGS software level, and follow relevant remedy instructions. (see attachment) AMG 43 models with VGS software levels up to 22A: As of 4/18/2025, an aftersales software improvement has been released. This software has been implemented in production as of model year 2024, however this LI should still be followed if the concern is present. 232 ‑ A0009025699 206 ‑ A0009025599 Please ensure your Xentry machine is up to date with the latest Add Ons and continue with the following steps: Note: ALL steps must be performed to rectify concern 1. Perform software update all control units included in VGS software update. 2. Check transmission oil level and correct, if necessary (transmission oil temperature > 60 °C) 3. Perform Xentry Valve Flushing procedure at least 3x 4. Perform resetting of deceleration values (VGS > Special Procedures > Special procedure > Resetting learned values Deceleration mode) 5. Perform a standstill adaptation, then read out new EEPROM data 6. Perform driving adaptation(s) while adhering to the below parameters for at least 20‑30 miles. Note: There is no menu in Xentry for this procedure. We recommend displaying the torque in the instrument cluster. If all below parameters are met at the time the shift, a driving adaptation will automatically occur. Harsh 1‑2 Perform a driving adaptation of 4‑5 (adapts K81 for the 1‑2 shift) Harsh 2‑3 Perform a driving adaptation of 6‑7 (adapts B05 for the 2‑3 shift) Harsh 3‑4 Perform a driving adaptation of 3‑4 (adapts K27 directly) ‑ See attached PDF for min/max torque, and RPM parameters ‑ Transmission oil temperature > 30°C (>86°F) ‑ Level track (no incline/decline) ‑ Slippery drive program ‑ Display the torque in the instrument cluster ‑ Constant engine torque ‑ Do not shift via paddle AMG 63 models with VGS software levels up to 22A: No aftersales software resolution is planned. Perform above steps and release the vehicle. If the vehicle returns and already had ALL steps in this LI performed on a previous visit, or has software level 23A and newer: Please submit a TIPS case to the Powertrain inbox and ensure the following is included: ‑ Initial Quick Test w/ Freeze Frame Data ‑ VGS Control Unit Log ‑ Initial EEPROM (before any adaptations or Xentry procedures were performed) ‑ Detailed vehicle history of the complaint

Complaint Tailgate opens unintentionally. Cause Accidental or unnoticed activation of the button to open the tailgate on the vehicle key. EXAMPLE: when stored in trouser pocket, handbag etc. Remedy As of the 6th generation, the vehicle key can be recoded so that the tailgate no longer opens as a result of a long press on the button, but by double‑clicking on the button instead. This reduces the likelihood of the button being activated accidentally or unintentionally. The recoding can be carried out as follows: 1. Add SA Code O19 into VeDoc (O for Oscar, not "zero") • an XSS ticket may be necessary to add the SA code 2. Perform SCN coding of EIS N73 control unit 3. Deactivate the vehicle key (a successful deactivation is indicated by the LED lighting up 2x briefly and then 1x for a long period). 4. Place the vehicle key in the storage compartment on the key symbol and turn on the ignition. IMPORTANT: all other vehicle keys must be outside the recognition range of the vehicle when doing this! Perform steps 3 and 4 successively for all vehicle keys. Notes: 6th, 7th and 8th generation keys can be deactivated as follows: Up to modification year 22/1 by double clicking the "Lock button" As of modification year 22/1, by press and holding the “Lock button", then double‑click the “Unlock button" at the same time. On model series 167, the storage compartment with the key symbol is located in the armrest. The SCN coding from the EZS is only transferred correctly to the vehicle key under the following conditions: Only one vehicle key is located in the vehicle, this key has been deactivated and it is positioned on the marking in the storage compartment for the data transfer. The costs for this adaptation are to be borne by the customer. For the newer BR 174, 178, 244, 248, 520, and 540, a software update must be initiated, as there is no way to perform SCN coding.

Dear Mercedes-Benz Owner: In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA is extending the warranty coverage for the Diagnostic Module for Tank Leakage Detection ("DMTL") on your vehicle from the original New Vehicle Limited Warranty of 4 years / 50,000 miles to 15 years/150,000 miles (whichever occurs first). This applies to the vehicle regardless of ownership. Why the Warranty extension? On certain Model Year 2018 - 2024 A / C / CLA / CLS / E / G / GLA / GLB / GLC / GLE / GLS / GT / S / SL Mercedes-Benz vehicles, under certain circumstances, the DMTL may trigger erroneous Diagnostic Trouble Code ("DTC") entries that may result in the illumination of the Check Engine Malfunction Indicator Lamp ("MIL"). Any repairs under this warranty extension must be performed by an authorized Mercedes-Benz dealership. • If your preferred authorized Mercedes-Benz dealership performs a diagnosis and confirms that your vehicle has the issue, the repair will be covered under this extended warranty and performed at no cost to you. • This extended warranty does not apply to any other components or conditions beyond the ones mentioned above, and standard warranty terms apply, including the exclusions with respect to extra expenses, as identified in the Service and Warranty Information booklet.

Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics. Cause Various root causes Remedy See attached diagnostic guide.

Complaint A popup is seen on the HU with the message "data connection temporarily not available". Potentially affected functionalities in NTG4.5, NTG5 1.Weather 2.Local Search 3.IP Radio 4.Send2Car 5.Speech Detection Service 6.Navigation 7.iHeartRadio 8.Traffic Cams Cause MB Apps is sundowned for all vehicles with NTG4.5 and NTG5 Head Unit Variant. Remedy No support available for NTG4.5 and NTG5 Head Unit Variants for MB App related topics. Note: Please do not create TIPS. Please do not replace any components. HU/Hermes SW update / SCN coding will not fix the issue.