KNOWN FAULTS · Mercedes-Benz

Known faults for the Mercedes-Benz AMG GT 4-Door Coupé (X290).

2018–2026 · Petrol / Plug-in hybrid

Sources are not verified in real time and no entry confirms that your car is affected.

3 known faults with sources

Engines: 43 / 53 (3.0) (Petrol)

48 V system, electric water pump and carbon on the M256 six-cylinderEngine

Engine / equipment: 3.0 inline-six M256 with 48 V ISG (EQ Boost): E 53, CLE 53, AMG GT 4-door 43/53, CLS, GLE and GLS
Period mentioned: 2018 onwards
Symptoms: Mild-hybrid system warnings, loss of EQ Boost and weaker acceleration; turbo overheating if the auxiliary pump fails; at high mileage, carbon on the intake valves.
Possible cause described: According to Jalopnik, ISG and 48 V faults are the most cited; there were campaigns for the electric coolant pump (NHTSA 19V-605, 2019 CLS), a loose 48 V ground with fire risk (24V-207, GLE and GLS) and a 2025 bulletin for 48 V battery software on 2019–2021 CLS, E-Class, GLE, GLS and AMG GT.
Check for the garage: Read the 48 V system fault memory; check campaigns and bulletins by VIN; stick to the oil-change intervals.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Engines: 63 / 63 S (4.0 V8) (Petrol)

Applies if: US recall for model years 2019–2021; in Europe, ask by VIN.

Badly fitted starter positive cable on the AMG GT 63 4-doorElectrical and electronic systems

Engine / equipment: 4.0 V8 biturbo (M177) of the Mercedes-AMG GT 63 / 63 S 4-Door Coupé (also the E 63 S)
Period mentioned: 2018–2021
Symptoms: The engine suddenly stalls; electrical faults; a burning smell in the engine bay.
Possible cause described: The starter motor positive cable may have been fitted incorrectly, letting the power-supply wires chafe; a short circuit can stall the car while driving and raises the fire risk. US recall 21V-217 for 2019–2021 model-year AMG GT 63 and 63 S 4-door cars and 2018–2021 E 63 S: the screw connections and the cable position are checked and corrected.
Check for the garage: Ask by VIN at a Mercedes dealer whether the starter-cable campaign was done.
Cost cited in the source: Free under the recall.A rough figure from the original database, not an up-to-date quote.

Engines: 63 S E Performance (Plug-in hybrid)

Applies if: US recall; in Europe, ask by VIN.

Loss of drive from the high-voltage starter-alternator control unit (AMG 63 S E Performance)High-voltage battery

Engine / equipment: Mercedes-AMG 63 S E Performance plug-in hybrids: GT 4-door, S 63, SL 63, GLC 63 and AMG GT
Period mentioned: 2023–2025
Symptoms: Hybrid-system fault warnings and sudden loss of drive.
Possible cause described: A software error may make the high-voltage starter-alternator control unit fail, leaving the car without drive. US recall 25V-129 (2,943 cars; on the GT 4-door, model years 2023–2024): the unit’s software is updated.
Check for the garage: Ask by VIN at a Mercedes dealer whether the starter-alternator unit software has been updated.
Cost cited in the source: Free under the recall.A rough figure from the original database, not an up-to-date quote.