OBD Guide
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C2122

No Signal from Transmitter ID 2 In Main Mode

C2122 is an OBD-II diagnostic trouble code meaning: No Signal from Transmitter ID 2 In Main Mode. Common causes: broken or damaged wiring harness, transmitter id 2 fault. 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
  • Restraint system inactive
  • Possible problems with the operation of airbags

Causes

  • Broken or damaged wiring harness
  • Transmitter ID 2 fault
  • Problems with the SRS control unit
  • Short circuit in the circuit
  • Contact corrosion

How to Fix

  1. Check the integrity of the wiring harness
  2. Check ID 2 transmitter for damage
  3. Check contacts for corrosion
  4. Check SRS control unit
  5. Replace faulty components

Related codes

C2121C2123B0001

FAQ

What does the C2122 code mean?

C2122 is an OBD-II diagnostic trouble code that indicates: No Signal from Transmitter ID 2 In Main Mode

What causes a C2122 error code?

The most common causes of C2122 include: Broken or damaged wiring harness; Transmitter ID 2 fault; Problems with the SRS control unit; Short circuit in the circuit.

How do I fix a C2122 diagnostic trouble code?

To fix C2122: Check the integrity of the wiring harness. Check ID 2 transmitter for damage. Check contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C2122?

Do not drive — repair immediately

How much does it cost to fix C2122?

The estimated repair cost for C2122 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat