OBD Guide
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B1638

Rear Airbag Sensor Assembly Left Initialization Incomplete

B1638 is an OBD-II diagnostic trouble code meaning: Rear Airbag Sensor Assembly Left Initialization Incomplete. Common causes: left side airbag sensor malfunction, wiring harness damage. 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
  • SRS can be deactivated
  • Possible problems with other components of the passive safety system

Causes

  • Left side airbag sensor malfunction
  • Wiring harness damage
  • Poor contact in connectors
  • SRS control unit malfunction
  • Power or grounding problems

How to Fix

  1. Check the condition of the sensor and its fastening
  2. Inspect the wiring harness for damage
  3. Check contacts in connectors
  4. Test the sensor using diagnostic equipment
  5. If necessary, replace the sensor or wiring harness
  6. Reset the error and check the system

Related codes

B1637B1639B1640

FAQ

What does the B1638 code mean?

B1638 is an OBD-II diagnostic trouble code that indicates: Rear Airbag Sensor Assembly Left Initialization Incomplete

What causes a B1638 error code?

The most common causes of B1638 include: Left side airbag sensor malfunction; Wiring harness damage; Poor contact in connectors; SRS control unit malfunction.

How do I fix a B1638 diagnostic trouble code?

To fix B1638: Check the condition of the sensor and its fastening. Inspect the wiring harness for damage. Check contacts in connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1638?

Do not drive — repair immediately

How much does it cost to fix B1638?

The estimated repair cost for B1638 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat