OBD Guide
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B1C28

Left Side Seat Thorax Squib 1 High

B1C28 is an OBD-II diagnostic trouble code meaning: Left Side Seat Thorax Squib 1 High. Common causes: open circuit of the squib, corrosion of contacts/connectors. Estimated repair cost: $56–222.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–222 (est.)

Symptoms

  • SRS/Airbag light is on
  • SRS disabled (on some models)
  • Security error message on display

Causes

  • Open circuit of the squib
  • Corrosion of contacts/connectors
  • Squib malfunction
  • Damage to the wiring harness in the seat/door area
  • Problems with the SRS control unit (less common)

How to Fix

  1. Check code history (related errors are possible)
  2. Disconnect the battery and wait 10 minutes (required for working with SRS)
  3. Visually inspect the wiring harness at the left seat and door
  4. Check the resistance of the squib (usually 2-3 ohms)
  5. Clean the connector contacts (if necessary)
  6. Replace the squib or harness if a malfunction is detected
  7. Reset errors and check the system

Related codes

B1C29B1C2AB1C2B

FAQ

What does the B1C28 code mean?

B1C28 is an OBD-II diagnostic trouble code that indicates: Left Side Seat Thorax Squib 1 High

What causes a B1C28 error code?

The most common causes of B1C28 include: Open circuit of the squib; Corrosion of contacts/connectors; Squib malfunction; Damage to the wiring harness in the seat/door area.

How do I fix a B1C28 diagnostic trouble code?

To fix B1C28: Check code history (related errors are possible). Disconnect the battery and wait 10 minutes (required for working with SRS). Visually inspect the wiring harness at the left seat and door. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1C28?

Do not drive — repair immediately

How much does it cost to fix B1C28?

The estimated repair cost for B1C28 is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat