OBD Guide
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B1040

Crash Zone Sensor

B1040 is an OBD-II diagnostic trouble code meaning: Crash Zone Sensor. Common causes: mechanical damage to the sensor, open or short circuit in wiring harness. 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
  • System does not activate airbags during testing
  • Error persists after reset

Causes

  • Mechanical damage to the sensor
  • Open or short circuit in wiring harness
  • Contact corrosion
  • Incorrect programming after module replacement

How to Fix

  1. Visual checker and wiring harness
  2. Checking the sensor resistance
  3. Diagnosis of power supply and ground circuits
  4. Replace the sensor if necessary
  5. Resetting the error and testing the system

Related codes

B1030B1041B1000

FAQ

What does the B1040 code mean?

B1040 is an OBD-II diagnostic trouble code that indicates: Crash Zone Sensor

What causes a B1040 error code?

The most common causes of B1040 include: Mechanical damage to the sensor; Open or short circuit in wiring harness; Contact corrosion; Incorrect programming after module replacement.

How do I fix a B1040 diagnostic trouble code?

To fix B1040: Visual checker and wiring harness. Checking the sensor resistance. Diagnosis of power supply and ground circuits. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1040?

Do not drive — repair immediately

How much does it cost to fix B1040?

The estimated repair cost for B1040 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat