U1138 CAN communication with component ''Auxiliary oil pump''has a malfunction. Mercedes C20 

U1138 CAN communication with component ''Auxiliary oil pump''has a malfunction. Mercedes C20
The U1138 error code in a Mercedes C200 indicates a malfunction in the Controller Area Network (CAN) communication with the "Auxiliary Oil Pump" component. This could be due to a wiring issue, faulty connections, or problems with the auxiliary oil pump itself. To diagnose and fix the problem, it's advisable to perform a thorough inspection of the CAN bus connections, check wiring integrity, and assess the auxiliary oil pump for any faults. If the issue persists, seeking assistance from a qualified mechanic or a Mercedes dealership is recommended for a detailed diagnosis and repair.