KNOWN FAULTS · Mercedes-Benz
Mercedes-Benz CLE (C236/A236) CLE 53 AMG (3.0) common problems.
2023–2026 · Petrol
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.