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2023 Mercedes-Benz AMG GT Problems: 4 Known Issues

2023 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated August 2026

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2023 Mercedes-Benz AMG GT has 4 documented known issues, with 4 rated critical. The most serious are High-Voltage Starter-Alternator Control Unit Software Fault Causes Loss of Drive Power (GT 63 S E Performance Plug-In Hybrid), 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) and Misrouted Transmission Wiring Harness Connector Corrodes and Short-Circuits (Fire Risk, Recall Repeated After Failed First Remedy). Across all issues with published estimates, repair costs range from $900 to $3,500. DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common Mercedes-Benz AMG GT problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2023 Mercedes-Benz AMG GT has 4 documented issues. The most frequently reported are: High-Voltage Starter-Alternator Control Unit Software Fault Causes Loss of Drive Power (GT 63 S E Performance Plug-In Hybrid), 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, 4 are rated critical and should be addressed promptly.

Is the Mercedes-Benz AMG GT reliable?

The 2023 Mercedes-Benz AMG GT has 4 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 4 issues are rated critical: High-Voltage Starter-Alternator Control Unit Software Fault Causes Loss of Drive Power (GT 63 S E Performance Plug-In Hybrid) 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). 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.

How much does it cost to fix common Mercedes-Benz AMG GT problems?

Repair costs for known Mercedes-Benz AMG GT issues range from $900 to $3,500, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2023-2025 Mercedes-Benz AMG GT High-Voltage Starter-Alternator Control Unit Software Fault Causes Loss of Drive Power (GT 63 S E Performance Plug-In Hybrid)?

The AMG GT 63 S E Performance is a plug-in hybrid and is a fundamentally different electrical architecture from every other GT — it carries a high-voltage battery and a high-voltage starter-alternator on top of the M177 V8. NHTSA campaign 25V129000 covers 2023-2024 and 2025 AMG G… Severity: high.

What is the 2021-2024 Mercedes-Benz AMG GT Fuel Pump Impeller Deformation Causes Engine Shutdown and Failure to Restart?

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.

What is the 2019-2025 Mercedes-Benz AMG GT 48-Volt EQ Boost System: Loose Ground Cable (Fire Recall) and 48V Battery / Starter-Generator Failure Causing No-Start?

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.

What is the 2019-2025 Mercedes-Benz AMG GT Misrouted Transmission Wiring Harness Connector Corrodes and Short-Circuits (Fire Risk, Recall Repeated After Failed First Remedy)?

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.

2023 Mercedes-Benz AMG GT Problems: 4 Known Issues

In This Article

All 4 Known Issues

2023-2025 Mercedes-Benz AMG GT: High-Voltage Starter-Alternator Control Unit Software Fault Causes Loss of Drive Power (GT 63 S E Performance Plug-In Hybrid)#

Common Symptoms

How to Fix

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2019-2025 Mercedes-Benz AMG GT: 48-Volt EQ Boost System: Loose Ground Cable (Fire Recall) and 48V Battery / Starter-Generator Failure Causing No-Start#

Common Symptoms

How to Fix

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2019-2025 Mercedes-Benz AMG GT: Misrouted Transmission Wiring Harness Connector Corrodes and Short-Circuits (Fire Risk, Recall Repeated After Failed First Remedy)#

Common Symptoms

How to Fix

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2021-2024 Mercedes-Benz AMG GT: Fuel Pump Impeller Deformation Causes Engine Shutdown and Failure to Restart#

Common Symptoms

How to Fix

Research This Issue

Other Mercedes-Benz Models

Frequently Asked Questions

What are the most common Mercedes-Benz AMG GT problems?

Is the Mercedes-Benz AMG GT reliable?

How much does it cost to fix common Mercedes-Benz AMG GT problems?

What is the 2023-2025 Mercedes-Benz AMG GT High-Voltage Starter-Alternator Control Unit Software Fault Causes Loss of Drive Power (GT 63 S E Performance Plug-In Hybrid)?

What is the 2021-2024 Mercedes-Benz AMG GT Fuel Pump Impeller Deformation Causes Engine Shutdown and Failure to Restart?

What is the 2019-2025 Mercedes-Benz AMG GT 48-Volt EQ Boost System: Loose Ground Cable (Fire Recall) and 48V Battery / Starter-Generator Failure Causing No-Start?

What is the 2019-2025 Mercedes-Benz AMG GT Misrouted Transmission Wiring Harness Connector Corrodes and Short-Circuits (Fire Risk, Recall Repeated After Failed First Remedy)?