KNOWN FAULTS · Mercedes-Benz

Mercedes-Benz Clase E (W214) E 53 AMG Hybrid (3.0) common problems.

2023–2026 · Plug-in hybrid

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

1 known fault with sources

Applies if: Same M256 with ISG; the documented cases are from other models with this engine.

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.