OBD Guide
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C2172

Transmitter ID Not Registered In 2nd Mode

C2172 is an OBD-II diagnostic trouble code meaning: Transmitter ID Not Registered In 2nd Mode. Common causes: transmitter (shock sensor or squib) malfunction, wiring harness damage. Estimated repair cost: $56–167.

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

Symptoms

  • Airbag light is on
  • Disabling some restraint system features
  • System diagnostic error

Causes

  • Transmitter (shock sensor or squib) malfunction
  • Wiring harness damage
  • Problems with the restraint control module
  • Corrosion or poor contact in connectors

How to Fix

  1. Check wiring harness for damage
  2. Check the transmitter (shock sensor or squib) for serviceability
  3. Check contacts in connectors
  4. Scan the control module for errors
  5. If necessary, replace faulty components

Related codes

B0001B0010B0020

FAQ

What does the C2172 code mean?

C2172 is an OBD-II diagnostic trouble code that indicates: Transmitter ID Not Registered In 2nd Mode

What causes a C2172 error code?

The most common causes of C2172 include: Transmitter (shock sensor or squib) malfunction; Wiring harness damage; Problems with the restraint control module; Corrosion or poor contact in connectors.

How do I fix a C2172 diagnostic trouble code?

To fix C2172: Check wiring harness for damage. Check the transmitter (shock sensor or squib) for serviceability. Check contacts in connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C2172?

Do not drive — repair immediately

How much does it cost to fix C2172?

The estimated repair cost for C2172 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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