Sök
B0021
System
Supplemental Restraint (Airbag)
Scanner som krävs
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Side Airbag Deployment Control — Passenger Side

Understand B0021, common causes, and the right TOPDON scanner to diagnose it.

Passenger side airbag circuit malfunction.

Vanliga symptom

  • SRS light on

Typiska orsaker

  • Passenger seat side bag module
  • Wiring in B-pillar
  • Connector under seat

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 B0021 mean?
B0021 indicates side airbag deployment control — passenger side. Passenger side airbag circuit malfunction.
Can I diagnose B0021 with a basic code reader?
B0021 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 B0021?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with B0021?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.