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RecallGazette

Vehicle problems, recalls & safety intelligence

Mercedes-Benz AMG CLS53 2019–2024technical service bulletin

Bulletin LI20.40-P-078593 · NHTSA communication 11010744 · issued Nov 19, 2024

Technical service bulletin
communication type
Engine
component
2019–2024
model years
48
vehicle entries

Official summary

Complaint Engine cooling fan running for an extended time after switching off vehicle. Cause Optimized thermal management in latest PTCU software. Remedy This is a normal function in the latest PTCU software. Engine fan will operate for up to 20 minutes after ignition is switched off. Note: Repair work should only be performed if a clear malfunction is identified

What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.