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February 13, 2026 Service bulletin

A noticeable jerk or jolt from the transmission occurs in electric driving mode (E mode), between 20-40 mph

Mercedes-Benz technical service bulletin LI27.60-P-078998 for 2024-2025 Mercedes-Benz AMG S 63 E 4matic+, 2024 Mercedes-Benz AMG C63 S E and 2024-2025 Mercedes-Benz AMG C63 S E 4matic+ and others.

Bulletin number
LI27.60-P-078998
Component
Power train
Summary
Complaint A noticeable jerk or jolt from the transmission occurs in electric driving mode (E mode), between 20-40 mph. Concern is mainly felt when coasting. Cause Parameters of the 5–4 neutral downshift (the shift method used in EV operation). Remedy This shift concern is considered normal for vehicles with this drivetrain. Hardware replacement does not change the root cause of the concern, as the observed shift behavior is characteristic of normal system function rather than a component‑related fault. The following adaptations may improve the shift quality: 1. Check transmission oil level (transmission oil temperature > 60°C) 2. Flush valves via Xentry procedure 3. Perform standstill adaptation 4. Perform driving adaptations for the 5–4 shift while following the below parameters: - Drive program: Slippery - Display torque in the instrument cluster - Do not shift using the paddles During coasting downshift 5-4: - Torque between –90 and –15 Nm (-66 and -11 ft-lb) - Maximum engine speed: 1,300 rpm

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