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U0122
System
Network (CAN Bus)
Benötigter Scanner
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Lost Communication with Vehicle Dynamics Control Module

Understand U0122, common causes, and the right TOPDON scanner to diagnose it.

Stability/yaw control module offline — ESC and ABS may be disabled.

Häufige Symptome

  • ESC off light
  • ABS light
  • Handling warning

Typische Ursachen

  • VDC module fault
  • Wheel speed sensor cascade
  • CAN bus off

Welchen Scanner brauchen Sie?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Nutzen Sie Live-Daten und Freeze Frame, bevor Sie Teile tauschen. ABS-, SRS- und U-Codes erfordern meist einen Vollsystem-Scanner.

Diagnose-Tipps

  • Freeze Frame erfassen, wenn der Code erstmals gesetzt wird
  • Code erst nach Behebung der Ursache löschen
  • Auf verwandte pending codes prüfen
  • Batteriespannung über 12,4 V prüfen, bevor Sie Sensoren verdächtigen

Empfohlene TOPDON Scanner

Häufig gestellte Fragen

What does U0122 mean?
U0122 indicates lost communication with vehicle dynamics control module. Stability/yaw control module offline — ESC and ABS may be disabled.
Can I diagnose U0122 with a basic code reader?
U0122 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for U0122?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with U0122?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.