OBD Guide
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C1720

Function Code Data From Front Left Transmitter Is Malfunctioning

C1720 is an OBD-II diagnostic trouble code meaning: Function Code Data From Front Left Transmitter Is Malfunctioning. Common causes: broken or damaged wiring harness to the transmitter, front left transmitter malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • The passive safety system fault indicator is on
  • The passive safety system may not work in an emergency situation
  • Possible false alarms of the system

Causes

  • Broken or damaged wiring harness to the transmitter
  • Front left transmitter malfunction
  • Contact corrosion
  • Problems with the passive safety control module

How to Fix

  1. Check the integrity of the wiring harness to the transmitter
  2. Inspect contacts for corrosion
  3. Check the functionality of the transmitter
  4. Replace transmitter or wiring harness if necessary
  5. Reset the error and test the system

Related codes

B0010B0013B0020

FAQ

What does the C1720 code mean?

C1720 is an OBD-II diagnostic trouble code that indicates: Function Code Data From Front Left Transmitter Is Malfunctioning

What causes a C1720 error code?

The most common causes of C1720 include: Broken or damaged wiring harness to the transmitter; Front left transmitter malfunction; Contact corrosion; Problems with the passive safety control module.

How do I fix a C1720 diagnostic trouble code?

To fix C1720: Check the integrity of the wiring harness to the transmitter. Inspect contacts for corrosion. Check the functionality of the transmitter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1720?

Do not drive — repair immediately

How much does it cost to fix C1720?

The estimated repair cost for C1720 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat