OBD Guide
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B1871

Passenger Air Bag Deactivation Switch Fault

B1871 is an OBD-II diagnostic trouble code meaning: Passenger Air Bag Deactivation Switch Fault. Common causes: open or short circuit in wiring harness, faulty deactivation switch. Estimated repair cost: $56–167.

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

Symptoms

  • The airbag malfunction indicator is on
  • Passenger airbag does not activate
  • The deactivation switch does not respond to pressing

Causes

  • Open or short circuit in wiring harness
  • Faulty deactivation switch
  • Problems with the airbag control module
  • Oxidized or damaged contacts

How to Fix

  1. Check wiring harness for damage
  2. Test the deactivation switch
  3. Clean or replace contacts
  4. Check the airbag control module
  5. Reset the error and test the system

Related codes

B1870B1872B1000

FAQ

What does the B1871 code mean?

B1871 is an OBD-II diagnostic trouble code that indicates: Passenger Air Bag Deactivation Switch Fault

What causes a B1871 error code?

The most common causes of B1871 include: Open or short circuit in wiring harness; Faulty deactivation switch; Problems with the airbag control module; Oxidized or damaged contacts.

How do I fix a B1871 diagnostic trouble code?

To fix B1871: Check wiring harness for damage. Test the deactivation switch. Clean or replace contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1871?

Do not drive — repair immediately

How much does it cost to fix B1871?

The estimated repair cost for B1871 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat