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September 9, 2026 Service bulletin

CEL light on with no drivability concerns

Mercedes-Benz technical service bulletin LI54.21-P-080326 for 2020-2024 Mercedes-Benz GLE 350, 2020-2021 Mercedes-Benz GLS 450 and 2020-2024 Mercedes-Benz GLE 450 and others.

Bulletin number
LI54.21-P-080326
Component
Electrical system
Summary
Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167, 465: SW has been released. Update the FSAM to the latest SW version. 290, 118, 243, 247: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2‑ 3 key cycles. The vehicle can be released back to the customer.

Owners of these vehicles have filed 156 complaints in the electrical category.

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