LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> BMW >> 2016 >> M4 Base, 2D Convertible, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Self Diagnosis - Diagnostic Trouble Codes (S55) >> Fault Code Tests >> DTC U0123: BMW DTC Cd9933; DME -- Lost Communication With Yaw Rate Sensor Module >> Action in service
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Action in service

  1. Carry out the test procedure "System analysis: message not present".

    In this procedure, all "Message not present" fault entries on all control units are analyzed.

    This makes it possible to localize the fault to a particular sector (most likely fault cause).

  2. In many cases the faults only occur sporadically. To determine the precise fault cause additional measurements based on the results of the analysis routine need to be carried out (voltage supply, short circuit, contact problems).

    If it proves impossible to identify a clear and unambiguous fault cause and the fault pattern continues to appear repeatedly (repeat repairs), then it may be necessary to replace the related wiring, plug connections or the control unit.

IMPORTANT: If the fault only appears sporadically (no repeat repair) and if no customer complaints concerning the problem have been received, then replacement of the related control unit is neither approved nor logical.
NOTE: These faults usually appear in large numbers. If only a single fault related to a missing message has been entered and no problems related to the function of the control unit are present, then the fault can be ignored.
scientia non olet · About LEMON Manuals