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U0157
System
Network (CAN Bus)
Benötigter Scanner
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Lost Communication with Immobilizer Control Module

Understand U0157, common causes, and the right TOPDON scanner to diagnose it.

Immobilizer module not communicating — no-start possible.

Häufige Symptome

  • No-start
  • Security light flashing

Typische Ursachen

  • Failed immobilizer
  • Key not recognized
  • CAN wiring
  • Security module water damage

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 U0157 mean?
U0157 indicates lost communication with immobilizer control module. Immobilizer module not communicating — no-start possible.
Can I diagnose U0157 with a basic code reader?
U0157 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 U0157?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with U0157?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.