OBD Guide
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B1B21

Right Side Curtain Squib 1 Circuit High

B1B21 is an OBD-II diagnostic trouble code meaning: Right Side Curtain Squib 1 Circuit High. Common causes: broken or damaged wiring harness, contact corrosion. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • SRS/airbag indicator is on
  • Security error message
  • The curtain airbag may not deploy in an accident.

Causes

  • Broken or damaged wiring harness
  • Contact corrosion
  • Squib malfunction
  • Problems with the SRS control unit

How to Fix

  1. Diagnose the SRS system with a scanner
  2. Check the integrity of the wiring harness
  3. Inspect contacts for corrosion
  4. Check squib resistance
  5. Replace damaged components if necessary

Related codes

B1B20B1B22B1B23

FAQ

What does the B1B21 code mean?

B1B21 is an OBD-II diagnostic trouble code that indicates: Right Side Curtain Squib 1 Circuit High

What causes a B1B21 error code?

The most common causes of B1B21 include: Broken or damaged wiring harness; Contact corrosion; Squib malfunction; Problems with the SRS control unit.

How do I fix a B1B21 diagnostic trouble code?

To fix B1B21: Diagnose the SRS system with a scanner. Check the integrity of the wiring harness. Inspect contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1B21?

Do not drive — repair immediately

How much does it cost to fix B1B21?

The estimated repair cost for B1B21 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat