AutoCodes – Scion – C2126 Scion

C2126 Scion 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 Scion 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.

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Code Popularity 2,527

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 17, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C2126 Scion 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 Scion - Transmitter ID not Received in Main Mode - AutoCodes.com — C2126 Scion Code - Transmitter ID not Received in Main Mode

What does this mean?

What are the Possible Causes of the DTC C2126 Scion?

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

How to Fix the DTC C2126 Scion?

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 Scion 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 C2126 Scion Code

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

- Common symptoms include difficulty starting the vehicle, malfunctioning keyless entry system, and a flashing security light on the dashboard.

2. What could be causing the OBDII code C2126 in a Scion to trigger?

- The code C2126 typically triggers when there is a communication error between the key fob transmitter and the vehicle's security system module.

3. How can I troubleshoot the "Transmitter ID not Received in Main Mode" issue in my Scion?

- Start by checking the battery in your key fob, ensuring it has enough power. If the battery is fine, try reprogramming the key fob following the manufacturer's instructions.

4. Can a DIY enthusiast fix the OBDII code C2126 issue in a Scion at home?

- Yes, some cases of the C2126 code can be resolved at home by replacing the key fob battery or reprogramming the key fob. However, if the issue persists, it's best to seek professional help.

5. Is it safe to continue driving my Scion with the C2126 code triggered?

- It is generally safe to drive the vehicle with the C2126 code triggered, but you may experience inconvenience with the keyless entry system. It's recommended to address the issue promptly to avoid potential lockout situations.

6. How much does it typically cost to repair the OBDII code C2126 in a Scion at a dealership?

- The cost of repairing the C2126 code at a dealership can vary depending on the exact cause of the issue. It may range from a simple key fob battery replacement to more complex module reprogramming, costing anywhere from $50 to $300 or more.

7. What are the long-term effects of ignoring the OBDII code C2126 in a Scion?

- Ignoring the C2126 code may lead to continued issues with the keyless entry system, potential lockout situations, and increased inconvenience. It's best to address the problem promptly to avoid further complications.

8. Can weather conditions or environmental factors trigger the OBDII code C2126 in a Scion?

- Extreme weather conditions or electromagnetic interference can potentially disrupt the communication between the key fob transmitter and the vehicle's security system, leading to the C2126 code being triggered.