B1020
System
Supplemental Restraint (Airbag)
Scanner required
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Passenger Airbag Loop Circuit Failure

Understand B1020, common causes, and the right TOPDON scanner to diagnose it.

Passenger airbag squib circuit open or high resistance.

Common symptoms

  • SRS light on
  • Passenger airbag disabled indicator

Typical causes

  • Passenger bag connector
  • Occupancy sensor bypass for aftermarket seats
  • Module fault

What scanner do you need?

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

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Recommended TOPDON scanners

Frequently asked questions

Can I diagnose B1020 with a basic code reader?
B1020 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with B1020?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.