Mercedes-Benz · Known Issues
2021 Mercedes-Benz AMG GT Problems: 8 Known Issues
2021 model year · 210+ owner reports · Updated September 2026
2021 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
2021 model year · 210+ owner reports · Updated September 2026
2021 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
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According to Au7o's analysis of 210+ owner reports, the 2021 Mercedes-Benz AMG GT has 8 documented known issues, with 6 rated critical. The most serious are Getrag 7DCL750 Rear Transaxle Dual-Clutch Failure — Clutch Pack Wear, Speed Sensor Faults and Weep-Hole Leaks ($5,000-$15,000 repair), Fuel Pump Impeller Deformation Causes Engine Shutdown and Failure to Restart, 48-Volt EQ Boost System: Loose Ground Cable (Fire Recall) and 48V Battery / Starter-Generator Failure Causing No-Start ($900-$3,500 repair), Misrouted Transmission Wiring Harness Connector Corrodes and Short-Circuits (Fire Risk, Recall Repeated After Failed First Remedy), Front Wheel Speed Sensor Wiring Harness Defect on AMG GT Black Series (ABS/ESP Signal Loss) and Starter Motor Positive Cable Misinstalled — Harness Chafe, Short Circuit, Stall and Fire Risk. The most commonly reported issue is Active Transaxle Mount Connectivity Faults and Replacement with 210 owner reports. Across all issues with published estimates, repair costs range from $400 to $15,000. DIY maintenance guides at au7o.io.
ELECTRONIC STABILITY CONTROL (ESC)
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021 AMG GT Black Series vehicles. The wiring harness for the front wheel speed sensor may be the incorrect length, which could result in damage to the harness during certain driving conditions.
ELECTRICAL SYSTEM:SOFTWARE
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2022 CLA-Class, GLA-Class, GLE-Class, GLS-Class, SLC-Class, A-Class, AMG GT-Class, C-Class, E-Class, S-Class, SL-Class, GLC-Class, CLS-Class, GLB-Class, and G-Class vehicles. Please refer to MBUSA's recall report for specific vehicle model details. An error in the communication module's SIM card software can cause a mobile network connection failure, disabling the emergency call (eCall) system.
Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.
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According to Au7o's analysis of 210+ owner reports, the 2021 Mercedes-Benz AMG GT has 8 documented issues. The most frequently reported are: Getrag 7DCL750 Rear Transaxle Dual-Clutch Failure — Clutch Pack Wear, Speed Sensor Faults and Weep-Hole Leaks, Fuel Pump Impeller Deformation Causes Engine Shutdown and Failure to Restart, 48-Volt EQ Boost System: Loose Ground Cable (Fire Recall) and 48V Battery / Starter-Generator Failure Causing No-Start. Of these, 6 are rated critical and should be addressed promptly.
The 2021 Mercedes-Benz AMG GT has 8 known issues documented across 210+ owner reports. 6 issues are rated critical: Getrag 7DCL750 Rear Transaxle Dual-Clutch Failure — Clutch Pack Wear, Speed Sensor Faults and Weep-Hole Leaks and Fuel Pump Impeller Deformation Causes Engine Shutdown and Failure to Restart and 48-Volt EQ Boost System: Loose Ground Cable (Fire Recall) and 48V Battery / Starter-Generator Failure Causing No-Start and Misrouted Transmission Wiring Harness Connector Corrodes and Short-Circuits (Fire Risk, Recall Repeated After Failed First Remedy) and Front Wheel Speed Sensor Wiring Harness Defect on AMG GT Black Series (ABS/ESP Signal Loss) and Starter Motor Positive Cable Misinstalled — Harness Chafe, Short Circuit, Stall and Fire Risk. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Mercedes-Benz AMG GT issues range from $400 to $15,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Getrag 7DCL750 Rear Transaxle Dual-Clutch Failure — Clutch Pack Wear, Speed Sensor Faults and Weep-Hole Leaks, typically costs $5,000-$15,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
The C190/R190 two-door AMG GT does not use a torque-converter automatic. It uses a rear-mounted Getrag/Magna 7DCL750 seven-speed dual-clutch transaxle — the same family as the Ford GT unit — and it is the single most expensive failure point on the car. Owner and specialist report… Repairs typically run $5,000-$15,000. Severity: high.
The in-tank fuel pump fitted to a broad range of 2021-2024 Mercedes-Benz models including the AMG GT uses an impeller that did not meet material specification. The impeller swells or deforms in service, contacts the pump housing and binds. The mechanical resistance shuts the pump… Severity: high.
The GT 43 and GT 53 use the M256 inline-six with a 48-volt EQ Boost integrated starter-generator that replaces the conventional starter and alternator. Two distinct failures cluster here. First, a safety defect: NHTSA campaign 24V100000 covers 2021-2023 GT 43 and GT 53 whose 48-v… Repairs typically run $900-$3,500. Severity: high.
On the X290 four-door AMG GT (GT 43 / GT 53), the transmission wiring harness can be routed incorrectly so that the electrical connector sits where it is exposed to water and road spray. The connector corrodes, and the corroded contacts can short-circuit — which Mercedes-Benz its… Severity: high.
NHTSA campaign 22V042000 covers the 2021 AMG GT Black Series specifically for a front wheel speed sensor wiring harness defect, remedied by replacing the harness. The Black Series is the only GT with the M178 LS2 flat-plane-crank version of the 4.0L twin-turbo V8 and carries uniq… Severity: high.
On 2019-2021 AMG GT 63 and GT 63 S four-door models (sharing the recall with the 2018-2021 E63 S), the starter motor positive cable was not installed correctly at the factory. The misposition lets the power-supply harness wires chafe against adjacent structure. Once the insulatio… Severity: high.
The C190 AMG GT mounts its rear transaxle on three ACTIVE (electronically controlled) mounts that stiffen under hard cornering and soften at idle. The most common reported failure isn't rubber breakdown — it's wiring harness or connector corrosion at the mount sensors, which trip… Repairs typically run $400-$2,800. Severity: medium.
The AMG GT has been recalled repeatedly across its entire production run for defects in the telematics communication module that carries the emergency call function, and the campaigns stack across different root causes rather than repeating one. NHTSA 21V058000 covers 2016-2021 A… Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.