Sök
U0157
System
Network (CAN Bus)
Scanner som krävs
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.

Vanliga symptom

  • No-start
  • Security light flashing

Typiska orsaker

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

Vilken scanner behöver du?

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

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade TOPDON-scannrar

Vanliga frågor

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.