OBD Guide
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B1821

Open in Side Squib Right Circuit

B1821 is an OBD-II diagnostic trouble code meaning: Open in Side Squib Right Circuit. Common causes: broken wires in the harness, squib malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Airbag light is on
  • The passive safety system does not activate
  • Error B1821 in diagnostic scanner memory

Causes

  • Broken wires in the harness
  • Squib malfunction
  • Poor contact in the connector
  • Damage to the airbag control unit

How to Fix

  1. Check the integrity of the wiring harness
  2. Measure the resistance of the squib
  3. Inspect connectors for oxidation or damage
  4. If necessary, replace the squib or wiring harness.
  5. Reset the error and check the system

Related codes

B1820B1822B1823

FAQ

What does the B1821 code mean?

B1821 is an OBD-II diagnostic trouble code that indicates: Open in Side Squib Right Circuit

What causes a B1821 error code?

The most common causes of B1821 include: Broken wires in the harness; Squib malfunction; Poor contact in the connector; Damage to the airbag control unit.

How do I fix a B1821 diagnostic trouble code?

To fix B1821: Check the integrity of the wiring harness. Measure the resistance of the squib. Inspect connectors for oxidation or damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1821?

Do not drive — repair immediately

How much does it cost to fix B1821?

The estimated repair cost for B1821 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat