OBD Guide
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C2321

Transmitter 1 Function Code Abnormal

C2321 is an OBD-II diagnostic trouble code meaning: Transmitter 1 Function Code Abnormal. Common causes: transmitter 1 fault, wiring harness damage. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Reduced system efficiency
  • Problems with data transfer between modules

Causes

  • Transmitter 1 fault
  • Wiring harness damage
  • Problems with the control module
  • Corrosion or poor contact in connectors

How to Fix

  1. Check the condition of the wiring harness and connectors
  2. Test transmitter 1 for faults
  3. Transmitter replacement or wiring harness repair
  4. Reset the error and check the system

Related codes

C2322C2320P0600

FAQ

What does the C2321 code mean?

C2321 is an OBD-II diagnostic trouble code that indicates: Transmitter 1 Function Code Abnormal

What causes a C2321 error code?

The most common causes of C2321 include: Transmitter 1 fault; Wiring harness damage; Problems with the control module; Corrosion or poor contact in connectors.

How do I fix a C2321 diagnostic trouble code?

To fix C2321: Check the condition of the wiring harness and connectors. Test transmitter 1 for faults. Transmitter replacement or wiring harness repair. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C2321?

Limited driving only, diagnose soon

How much does it cost to fix C2321?

The estimated repair cost for C2321 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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