AutoCodes – Lexus – C2126 Lexus

C2126 Lexus Code - Transmitter ID not Received in Main Mode

Quick Answer

After all IDs are registered, Diagnostic Trouble Code (DTC) C2126/26 is stored in the Tire Pressure Warning ECU and Receiver and the tire pressure warning light blinks for 1 minute and then illuminates. Common causes include ID Registration Failure, 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: C2126 Lexus indicates Transmitter ID not Received in Main Mode.
Common causes: Common causes include ID Registration Failure, 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 17,357

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 17, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code C2126 Lexus Description

After all IDs are registered, Diagnostic Trouble Code (DTC) C2126/26 is stored in the Tire Pressure Warning ECU and Receiver and the tire pressure warning light blinks for 1 minute and then illuminates. When the Tire Pressure Warning ECU and Receiver successfully receive radio waves from all the transmitters whose IDs are stored in the ECU, DTC C2126/26 is cleared, and the tire pressure warning light goes off.

OBDII Code C2126 Lexus - Transmitter ID not Received in Main Mode - AutoCodes.com — C2126 Lexus Code - Transmitter ID not Received in Main Mode

What does this mean?

What are the Possible Causes of the DTC C2126 Lexus?

ID Registration Failure
Faulty Tire Pressure Warning Valve and Transmitter
Faulty Tire Pressure Warning ECU and Receiver

How to Fix the DTC C2126 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 C2126 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.

Need more information about the C2126 Lexus code?

Need more information on how to fix the C2126 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C2126 Lexus code diagnosed by a professional: Find a repair shop in your area

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 C2126 Lexus Code

1. What are the common symptoms of OBDII code C2126 in a Lexus related to "Transmitter ID not Received in Main Mode"?

The common symptoms include difficulty starting the vehicle, issues with the keyless entry system, and a warning light on the dashboard.

2. What are the possible causes of OBDII code C2126 in a Lexus?

Possible causes of this code include a faulty key fob, low battery in the key fob, issues with the receiver in the vehicle, or a communication error between the key fob and the vehicle.

3. How can I diagnose the issue causing OBDII code C2126 in my Lexus?

To diagnose the issue, you can start by checking the battery in the key fob, ensuring it is properly programmed to the vehicle, inspecting the receiver for any damage, and using a diagnostic tool to scan for specific error codes.

4. Can I fix OBDII code C2126 in my Lexus at home?

Depending on the cause, you may be able to fix the issue at home by replacing the key fob battery, reprogramming the key fob, or addressing any communication errors. However, more complex issues may require professional assistance.

5. Is it safe to continue driving with OBDII code C2126 in my Lexus?

While the vehicle may still be operable with this code, it is best to address the issue promptly to prevent any further complications with starting the vehicle or using the keyless entry system.

6. How much does it typically cost to repair OBDII code C2126 in a Lexus?

The cost of repair can vary depending on the underlying cause of the issue. Simple fixes like replacing a key fob battery may be inexpensive, while more complex repairs involving the receiver or communication system can be more costly.

7. Can a dealership or auto repair shop help me with OBDII code C2126 in my Lexus?

Yes, experienced technicians at a dealership or auto repair shop with knowledge of Lexus vehicles can diagnose and repair the issue related to OBDII code C2126.

8. What steps can I take to prevent OBDII code C2126 from occurring in my Lexus?

To prevent this code from occurring, regularly check and replace the key fob battery, keep the key fob and receiver clean, and avoid exposing the key fob to extreme temperatures or moisture.

9. Will resetting the OBDII system clear the code C2126 in my Lexus?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause of the problem.

10. How urgent is it to address OBDII code C2126 in my Lexus?

While the urgency may vary depending on the specific symptoms and driving conditions, it is generally recommended to address this code promptly to ensure the proper functioning of the vehicle's keyless entry system and starting mechanism.