OBD Guide
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B1140

Diagnosis Sensor Unit

B1140 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: srs diagnostic module malfunction, damage to the srs wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • The SRS indicator on the dashboard is on
  • The passive safety system does not activate
  • Errors in SRS system memory

Causes

  • SRS Diagnostic Module Malfunction
  • Damage to the SRS wiring harness
  • Short circuit in the circuit
  • Module power problems

How to Fix

  1. Diagnostics of the SRS system using a scanner
  2. Checking the wiring harness and connections
  3. Replacing the SRS diagnostic module if necessary
  4. Resetting errors and testing the system

Related codes

B1150B1160B1130

FAQ

What does the B1140 code mean?

B1140 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit

What causes a B1140 error code?

The most common causes of B1140 include: SRS Diagnostic Module Malfunction; Damage to the SRS wiring harness; Short circuit in the circuit; Module power problems.

How do I fix a B1140 diagnostic trouble code?

To fix B1140: Diagnostics of the SRS system using a scanner. Checking the wiring harness and connections. Replacing the SRS diagnostic module if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1140?

Do not drive — repair immediately

How much does it cost to fix B1140?

The estimated repair cost for B1140 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat