OBD Guide
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B1940

Short in Selectable Force Limiter Squib Right Circuit

B1940 is an OBD-II diagnostic trouble code meaning: Short in Selectable Force Limiter Squib Right Circuit. Common causes: wiring harness damage, contact corrosion. Estimated repair cost: $56–167.

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

Symptoms

  • Airbag light is on
  • SRS system does not pass self-diagnosis
  • Seat belt pretensioner does not engage during testing

Causes

  • Wiring harness damage
  • Contact corrosion
  • Pretensioner squib malfunction
  • Problem in the SRS control unit

How to Fix

  1. Check the resistance of the squib circuit
  2. Inspect the wiring harness for damage
  3. Check contacts for corrosion
  4. Replace faulty squib or wiring harness
  5. Reset error in SRS control unit

Related codes

B1935B1945

FAQ

What does the B1940 code mean?

B1940 is an OBD-II diagnostic trouble code that indicates: Short in Selectable Force Limiter Squib Right Circuit

What causes a B1940 error code?

The most common causes of B1940 include: Wiring harness damage; Contact corrosion; Pretensioner squib malfunction; Problem in the SRS control unit.

How do I fix a B1940 diagnostic trouble code?

To fix B1940: Check the resistance of the squib circuit. Inspect the wiring harness for damage. Check contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1940?

Limited driving only, diagnose soon

How much does it cost to fix B1940?

The estimated repair cost for B1940 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat