Mercedes-Benz GLC 300 2023–2025 — technical service bulletin
Bulletin LI20.00-P-076708 · NHTSA communication 11011557 · issued Dec 6, 2024
Technical service bulletin
communication type
Engine
component
2023–2025
model years
7
vehicle entries
Official summary
Complaint Check engine lamp activated, coolant warning message, and engine fan running at full speed. Below fault codes stored in N127 PTCU related to LIN network components. U063200, U063287, U02A900, U02A987, U0698E4, U0698E5, U02C800, U02C887, U063B00, U063B87 Cause Under analysis. Remedy Disconnect 12V battery and leave for 20 minutes. Reconnect battery and clear fault codes. Perform 2 test drives, with at least 5 minutes in between with ignition off. If vehicle operates normally, it can be released to the owner. If symptom reoccurs create a TIPS case with below information: • Initial quic
Vehicles covered
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.