OBD Guide
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C2126

Transmitter ID not Received in Main Mode

C2126 is an OBD-II diagnostic trouble code meaning: Transmitter ID not Received in Main Mode. Common causes: broken or damaged wiring harness, corrosion or oxidation of contacts. Estimated repair cost: $56–167.

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

Symptoms

  • SRS/Airbag light is on
  • Restraint system malfunction
  • No communication with SRS modules

Causes

  • Broken or damaged wiring harness
  • Corrosion or oxidation of contacts
  • Faulty transmitter (airbag/pretensioner module)
  • Problems with the SRS control unit

How to Fix

  1. Check the wiring harness for breaks and damage
  2. Clean the connector contacts
  3. Scan the SRS system for additional errors
  4. Check the functionality of the transmitters (modules)
  5. If necessary, replace the faulty component
  6. Reset the error and check the system

Related codes

B0001B0010C2127

FAQ

What does the C2126 code mean?

C2126 is an OBD-II diagnostic trouble code that indicates: Transmitter ID not Received in Main Mode

What causes a C2126 error code?

The most common causes of C2126 include: Broken or damaged wiring harness; Corrosion or oxidation of contacts; Faulty transmitter (airbag/pretensioner module); Problems with the SRS control unit.

How do I fix a C2126 diagnostic trouble code?

To fix C2126: Check the wiring harness for breaks and damage. Clean the connector contacts. Scan the SRS system for additional errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C2126?

Do not drive — repair immediately

How much does it cost to fix C2126?

The estimated repair cost for C2126 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat