Saturday, August 8, 2026
RecallGazette

Vehicle problems, recalls & safety intelligence

Mercedes-Benz C 300 2015–2020technical service bulletin

Bulletin LI01.20-P-076894 · NHTSA communication 10253722 · issued Apr 15, 2024

Technical service bulletin
communication type
Engine and Engine Cooling
component
2015–2020
model years
23
vehicle entries

Official summary

Check engine light illuminated Fault code stored in N3/10 control unit- P052E71 Positive Crankcase Ventilation Regulator Valve Performance: The valve for crankcase ventilation has a malfunction The partial-load ventilation valve (a part of the intake line assembly) may not work as intended. Model year 2015-2018 Performed guided test for fault code P052E71. Replace intake line assembly if necessary per results of the guided test. This LI will be updated once the software solution is available for model year 2015-2018 vehicles. Model year 2019 Perform software update for N3/10 Engine control uni

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.