OBD Guide
ENFRDEESPT

B1166

Open In Curtain Shield Squib LH Circuit

B1166 is an OBD-II diagnostic trouble code meaning: Open In Curtain Shield Squib LH Circuit. Common causes: broken wiring harness (harness) to the squib, poor contact in the squib connector. Estimated repair cost: $17–111.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$17–111 (est.)

Symptoms

  • Airbag light is on
  • The security system can disable the side curtain

Causes

  • Broken wiring harness (harness) to the squib
  • Poor contact in the squib connector
  • Malfunction of the squib itself
  • Damage to wires due to corrosion or mechanical stress

How to Fix

  1. Check the resistance of the squib circuit (should be within 2-5 Ohms)
  2. Inspect connectors and wiring harness for damage
  3. Replace the squib if necessary
  4. Clean the contacts in the connectors
  5. Reset the error with the scanner after repair

Related codes

B1165B1167B1000

FAQ

What does the B1166 code mean?

B1166 is an OBD-II diagnostic trouble code that indicates: Open In Curtain Shield Squib LH Circuit

What causes a B1166 error code?

The most common causes of B1166 include: Broken wiring harness (harness) to the squib; Poor contact in the squib connector; Malfunction of the squib itself; Damage to wires due to corrosion or mechanical stress.

How do I fix a B1166 diagnostic trouble code?

To fix B1166: Check the resistance of the squib circuit (should be within 2-5 Ohms). Inspect connectors and wiring harness for damage. Replace the squib if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1166?

Do not drive — repair immediately

How much does it cost to fix B1166?

The estimated repair cost for B1166 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat