OBD Guide
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B1B20

Right Side Curtain Squib 1 Circuit Low

B1B20 is an OBD-II diagnostic trouble code meaning: Right Side Curtain Squib 1 Circuit Low. Common causes: short circuit in the squib circuit, broken or damaged wiring. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • SRS (airbag) light is on
  • The passive safety system may not work in an accident.
  • The error is stored in the ECU memory

Causes

  • Short circuit in the squib circuit
  • Broken or damaged wiring
  • Contact corrosion
  • Squib malfunction
  • Problems with the SRS control unit

How to Fix

  1. Check the resistance of the squib circuit (should be within 2-5 Ohms)
  2. Inspect the wiring harness for damage
  3. Check contacts for oxidation
  4. If necessary, replace the squib or wiring
  5. Reset the error and check the system operation

Related codes

B1B21B1B22B1000

FAQ

What does the B1B20 code mean?

B1B20 is an OBD-II diagnostic trouble code that indicates: Right Side Curtain Squib 1 Circuit Low

What causes a B1B20 error code?

The most common causes of B1B20 include: Short circuit in the squib circuit; Broken or damaged wiring; Contact corrosion; Squib malfunction.

How do I fix a B1B20 diagnostic trouble code?

To fix B1B20: Check the resistance of the squib circuit (should be within 2-5 Ohms). Inspect the wiring harness for damage. Check contacts for oxidation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1B20?

Limited driving only, diagnose soon

How much does it cost to fix B1B20?

The estimated repair cost for B1B20 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat