OBD Guide
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B1637

Lost Communication With Rear Airbag Sensor Left

B1637 is an OBD-II diagnostic trouble code meaning: Lost Communication With Rear Airbag Sensor Left. Common causes: open or shorted wiring harness, side airbag sensor malfunction. 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 system does not pass self-diagnosis
  • Lack of sensor response when checking with a scanner

Causes

  • Open or shorted wiring harness
  • Side airbag sensor malfunction
  • Contact corrosion
  • Problems with the SRS control unit

How to Fix

  1. Check the integrity of the wiring harness to the sensor
  2. Test sensor resistance
  3. Clean contacts from corrosion
  4. Check the power and ground of the sensor circuit
  5. If necessary, replace the sensor or wiring harness
  6. Reset the error and check the system operation

Related codes

B1638B1636B1000

FAQ

What does the B1637 code mean?

B1637 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Rear Airbag Sensor Left

What causes a B1637 error code?

The most common causes of B1637 include: Open or shorted wiring harness; Side airbag sensor malfunction; Contact corrosion; Problems with the SRS control unit.

How do I fix a B1637 diagnostic trouble code?

To fix B1637: Check the integrity of the wiring harness to the sensor. Test sensor resistance. Clean contacts from corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1637?

Do not drive — repair immediately

How much does it cost to fix B1637?

The estimated repair cost for B1637 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat