Error P1939 - Speed ​​signal from component Y3/9b4 (CVT secondary speed sensor) unavailable


Reading error codes in a car is a crucial step in diagnosing problems with various vehicle systems, such as the engine, braking system, steering system, and other electronic systems.

Reading error codes with a diagnostic scanner. This is an electronic device that connects to the OBD-II (On-Board Diagnostics II) connector, usually located under the dashboard. Once connected, the scanner can read error codes recorded by various vehicle control modules. These codes are usually numbers that indicate specific problems or malfunctions in individual systems.

If you connected a diagnostic computer and received an error code P1939 this means that the driver automatic or semi-automatic gearbox is probably damaged.

Error description P1939:

Speed ​​signal from component Y3/9b4 (CVT secondary speed sensor) unavailable


Error symptoms P1939:

  • After the engine warms up, the gearbox enters emergency mode
  • Turbine speed sensor errors
  • Solenoid valve errors, sensor error
  • Gearbox does not work, unable to move
  • Incomprehensible speed signal from the sensor - signal disrupted
  • Gearbox jerks


It is found in cars such as:

  • Temic Continental 722.8 - Mercedes-Benz A-klasa, A150, A160, A170, A180, A200, W168, B-klasa, B150, B170, B180, B200, W169, W245, W246


Solving the problem P1939:

  • Driver repair automatic or semi-automatic gearbox
  • Call us +48 796 160 103


Błąd P1939 -