AutoCodes – Lexus – C2123 Lexus

C2123 Lexus Code - No Signal from Transmitter ID 3 In Main Mode

Quick Answer

The Tire Pressure Warning Valve and Transmitters that are installed in the tire and wheel assemblies measure the tire pressures. Common causes include Faulty Tire Pressure Warning Valve and Transmitter, Faulty Tire Pressure Warning ECU and Receiver. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C2123 Lexus indicates No Signal from Transmitter ID 3 In Main Mode.
Common causes: Common causes include Faulty Tire Pressure Warning Valve and Transmitter, Faulty Tire Pressure Warning ECU and Receiver.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 12,782

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 15, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C2123 Lexus Description

The Tire Pressure Warning Valve and Transmitters that are installed in the tire and wheel assemblies measure the tire pressures. The measured values are transmitted to the Tire Pressure Warning ECU and Receiver in the vehicle as radio waves. The ECU compares the measured air pressure values with the air pressure threshold. When the measured air pressure value is less than this threshold, the warning light in the combination meter assembly illuminates.
The Tire Pressure Warning Valve and Transmitters constantly send radio waves to the Tire Pressure Warning ECU and Receiver.
Under the conditions below, the Tire Pressure Warning ECU and Receiver is unable to receive the signals from the Tire Pressure Warning Valve and Transmitters, and a Diagnostic Trouble Code (DTC) is stored.
- Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.
- Devices using similar radio frequencies are used in the vehicle.
- The ID of the tire pressure warning valve and transmitter is mistyped during registration.
- A tire, wheel, and/or transmitter from a different vehicle is installed.

OBDII Code C2123 Lexus - No Signal from Transmitter ID 3 In Main Mode - AutoCodes.com — C2123 Lexus Code - No Signal from Transmitter ID 3 In Main Mode

What does this mean?

What are the Possible Causes of the DTC C2123 Lexus?

Faulty Tire Pressure Warning Valve and Transmitter
Faulty Tire Pressure Warning ECU and Receiver

How to Fix the DTC C2123 Lexus?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C2123 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C2123 Lexus Code

1. What does the OBDII code C2123 mean on a Lexus?

C2123 indicates that the vehicle's tire pressure monitoring system (TPMS) is not receiving a signal from the tire pressure sensor associated with Transmitter ID 3 in main mode.

2. What are the symptoms of code C2123 on a Lexus?

Common symptoms include a TPMS warning light on the dashboard and potentially inaccurate or missing tire pressure readings from one of the tires.

3. What causes the C2123 code to appear?

This code is typically caused by a malfunctioning or dead TPMS sensor, signal interference, a damaged wheel sensor, or an issue with the TPMS module.

4. How can I diagnose the C2123 code on a Lexus?

Use a scan tool that can read TPMS data to check for sensor IDs and signal status. Inspect the physical condition of the sensors and verify that the sensor ID matches the one programmed into the vehicle.

5. Can a dead TPMS sensor battery trigger the C2123 code?

Yes, a dead or low TPMS sensor battery is a common cause of this code, as it prevents the sensor from transmitting data.

6. How do I fix the C2123 code on my Lexus?

Replace the faulty TPMS sensor, reprogram the sensor ID if needed, and reset the TPMS system. Ensure all sensors are functioning and properly paired.

7. Do I need to replace all TPMS sensors if I get the C2123 code?

No, only the faulty sensor associated with Transmitter ID 3 needs to be replaced unless the other sensors are also failing or near the end of their battery life.

8. Will the TPMS warning light turn off automatically after fixing the C2123 code?

In most cases, the light will turn off after driving a short distance if the issue is resolved. Otherwise, you may need to manually reset the TPMS system using a scan tool.

9. Can I still drive my Lexus with the C2123 code active?

Yes, but the TPMS system may not properly monitor tire pressure, which could increase the risk of driving on underinflated or overinflated tires.

10. How much does it cost to repair a C2123 code on a Lexus?

The cost varies depending on the labor rates and the price of the replacement TPMS sensor, but it typically ranges between $50 and $150 per sensor, plus programming and installation fees.