What are the common symptoms of misfires in the 2021 Mercedes-Benz AMG GT?

Owners may notice a Check Engine Light illuminated, the engine running roughly or shaking, and a general loss of power or poor engine output. These symptoms are often indicative of combustion misfires.

Which DTCs are typically associated with AMG GT misfire DTCs?

Common DTCs include P030000 (general misfire), P031600 (misfires at engine start), and specific cylinder misfire codes like P030100 through P030800. Other related codes might detail signal amplitude issues or injector shutoff.

What components are usually involved when these misfire DTCs appear?

The primary component often implicated is the ignition coil, with part number A1779060206 being specified. The N3/10 Motor electronics control unit is responsible for detecting and reporting these misfires in the M17x.xxx engine group.

Is there a specific repair procedure for the 2021 Mercedes-Benz AMG GT misfire DTCs?

The detailed repair procedures are outlined in internal Mercedes-Benz documents, including "Remedy Instructions" and "Misfire LI Revision v5.pdf", which are provided to trained technicians. Owners should consult a Mercedes-Benz service center for proper diagnosis and repair.

Why is it important to address AMG GT misfire DTCs promptly?

Addressing misfires promptly is crucial to prevent potential damage to other engine components, such as the catalytic converter, and to restore optimal engine performance and fuel efficiency. Ignoring a Check Engine Light related to misfires can lead to more severe and costly repairs.

Service-Bulletin

2021 Mercedes-Benz AMG GT Misfire DTCs and CEL

Mercedes-Benz has issued TSB LI07.61-P-070707 for 2021 AMG GT models experiencing a Check Engine Light, rough running, and loss of power due to combustion misfires. The bulletin lists numerous P-codes and suggests ignition coil replacement.

Ahmet Topcu2021 Mercedes-Benz AMG GTApril 25, 2026

2021 Mercedes-Benz AMG GT — AMG GT misfire DTCs — Editorial illustration generated for this article.

LI07.61-P-070707LI07.61-P-076755P030000P031600P030100Check Engine Light onengine running roughlyloss of powerAMG GT misfire DTCsA1779060206

Owners of the 2021 Mercedes-Benz AMG GT may experience a Check Engine Light (CEL) illuminating on their dashboard, often accompanied by noticeable performance issues. This technical service bulletin (TSB) LI07.61-P-070707 addresses these concerns, specifically focusing on AMG GT misfire DTCs and related engine problems.

Symptoms

If your 2021 Mercedes-Benz AMG GT is affected, you might observe one or more of the following symptoms:

A "check engine light (CEL) on" in the instrument cluster, indicating an issue with the engine management system.
The engine "running roughly" or experiencing shakes, particularly during idle or acceleration.
A noticeable "loss of power" or "no/poor output" from the engine, affecting the vehicle's overall performance.

These symptoms are typically linked to combustion misfires within the engine, which the engine control unit detects and reports.

Fault Codes / DTCs

When these symptoms occur, a diagnostic scan will likely reveal one or more of the following Diagnostic Trouble Codes (DTCs) stored in the engine's control unit, specifically the N3/10 Motor electronics 'MRG1AMGV8' for the M177 engine or 'MED1775' for M176/M177/M178 engines. These AMG GT misfire DTCs pinpoint the nature and location of the misfire:

Code	Description
P031600	Combustion misfires were detected at engine start.
P030800	Combustion misfiring of cylinder 8 has been detected.
P030700	Combustion misfiring of cylinder 7 has been detected.
P030600	Combustion misfiring of cylinder 6 has been detected.
P030500	Combustion misfiring of cylinder 5 has been detected.
P030400	Combustion misfiring of cylinder 4 has been detected.
P030300	Combustion misfiring of cylinder 3 has been detected.
P030200	Combustion misfiring of cylinder 2 has been detected.
P030100	Combustion misfiring of cylinder 1 has been detected.
P030022	Combustion misfiring has been detected. The signal amplitude is greater than the maximum amplitude.
P030021	Combustion misfiring has been detected. The signal amplitude is less than the minimum amplitude.
P030000	Combustion misfiring has been detected.
P036300	Injector shutoff was activated due to a combustion misfire.
P030885	Combustion misfiring of cylinder 8 has been detected. There is a signal above the permissible limit value.
P030785	Combustion misfiring of cylinder 7 has been detected. There is a signal above the permissible limit value.
P030685	Combustion misfiring of cylinder 6 has been detected. There is a signal above the permissible limit value.
P030585	Combustion misfiring of cylinder 5 has been detected. There is a signal above the permissible limit value.
P030485	Combustion misfiring of cylinder 4 has been detected. There is a signal above the permissible limit value.
P030385	Combustion misfiring of cylinder 3 has been detected. There is a signal above the permissible limit value.
P030285	Combustion misfiring of cylinder 2 has been detected. There is a signal above the permissible limit value.
P030027	Combustion misfiring has been detected. The signal change rate is above the permissible limit value.
P030185	Combustion misfiring of cylinder 1 has been detected. There is a signal above the permissible limit value.

These codes indicate specific cylinders experiencing misfires (P030100-P030800) or general misfire conditions (P030000, P031600), sometimes with additional details about signal amplitudes (P030021, P030022, P030027) or injector shutoff (P036300).

Affected Components

The primary component identified in relation to these AMG GT misfire DTCs is the ignition coil. The TSB specifically mentions part number A1779060206, with eight units typically required for the M17x.xxx engine group. The engine control units, N3/10 Motor electronics 'MRG1AMGV8' and 'MED1775', are responsible for detecting and reporting these misfires.

What Owners Should Know

The detailed remedy instructions for addressing these misfires are contained in an internal Mercedes-Benz document titled "Remedy Instructions" and an attachment named "Misfire LI Revision v5.pdf", which are not publicly available. These documents guide trained technicians through the diagnostic and repair process. For certain 2019-2024 G63 models, an alternate solution might be available, referenced under LI07.61-P-076755.

If you are experiencing a Check Engine Light, rough running, or loss of power in your 2021 Mercedes-Benz AMG GT, it is crucial to have your vehicle inspected by a qualified Mercedes-Benz technician. They will be able to perform a diagnostic scan, identify the specific AMG GT misfire DTCs, and follow the manufacturer's recommended repair procedures, which may include replacing the ignition coils or other related components.

NHTSA ID: 11013175

Frequently Asked Questions

What are the common symptoms of misfires in the 2021 Mercedes-Benz AMG GT?: Owners may notice a Check Engine Light illuminated, the engine running roughly or shaking, and a general loss of power or poor engine output. These symptoms are often indicative of combustion misfires.
Which DTCs are typically associated with AMG GT misfire DTCs?: Common DTCs include P030000 (general misfire), P031600 (misfires at engine start), and specific cylinder misfire codes like P030100 through P030800. Other related codes might detail signal amplitude issues or injector shutoff.
What components are usually involved when these misfire DTCs appear?: The primary component often implicated is the ignition coil, with part number A1779060206 being specified. The N3/10 Motor electronics control unit is responsible for detecting and reporting these misfires in the M17x.xxx engine group.
Is there a specific repair procedure for the 2021 Mercedes-Benz AMG GT misfire DTCs?: The detailed repair procedures are outlined in internal Mercedes-Benz documents, including "Remedy Instructions" and "Misfire LI Revision v5.pdf", which are provided to trained technicians. Owners should consult a Mercedes-Benz service center for proper diagnosis and repair.
Why is it important to address AMG GT misfire DTCs promptly?: Addressing misfires promptly is crucial to prevent potential damage to other engine components, such as the catalytic converter, and to restore optimal engine performance and fuel efficiency. Ignoring a Check Engine Light related to misfires can lead to more severe and costly repairs.

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