OBD Guide
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C2131

No Signal From Transmitter ID 1 In 2nd Mode

C2131 is an OBD-II diagnostic trouble code meaning: No Signal From Transmitter ID 1 In 2nd Mode. Common causes: broken or damaged wiring harness, transmitter id 1 fault. Estimated repair cost: $56–222.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–222 (est.)

Symptoms

  • Airbag light is on
  • Seat belt pretensioners do not work
  • Error C2131 in the control unit memory

Causes

  • Broken or damaged wiring harness
  • Transmitter ID 1 fault
  • Problems with the restraint system control unit
  • Contact corrosion
  • Control unit software error

How to Fix

  1. Check the integrity of the wiring harness
  2. Check the status of transmitter ID 1
  3. Check contacts for corrosion
  4. Update or reflash the control unit if necessary
  5. Replace faulty components

Related codes

B0001B0010C2121

FAQ

What does the C2131 code mean?

C2131 is an OBD-II diagnostic trouble code that indicates: No Signal From Transmitter ID 1 In 2nd Mode

What causes a C2131 error code?

The most common causes of C2131 include: Broken or damaged wiring harness; Transmitter ID 1 fault; Problems with the restraint system control unit; Contact corrosion.

How do I fix a C2131 diagnostic trouble code?

To fix C2131: Check the integrity of the wiring harness. Check the status of transmitter ID 1. Check contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C2131?

Do not drive — repair immediately

How much does it cost to fix C2131?

The estimated repair cost for C2131 is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat