AutoCodes – Scion – C2125 Scion

C2125 Scion Code - No Signal from Transmitter ID 5 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: C2125 Scion indicates No Signal from Transmitter ID 5 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 780

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 C2125 Scion 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 C2125 Scion - No Signal from Transmitter ID 5 In Main Mode - AutoCodes.com — C2125 Scion Code - No Signal from Transmitter ID 5 In Main Mode

What does this mean?

What are the Possible Causes of the DTC C2125 Scion?

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

How to Fix the DTC C2125 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 C2125 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 C2125 Scion Code

What does OBDII code C2125 mean for a Scion?

OBDII code C2125 indicates that there is no signal from transmitter ID 5 in main mode, which typically relates to an issue with the tire pressure monitoring system (TPMS).

What are the common symptoms of the C2125 code?

Common symptoms include the TPMS warning light being illuminated on the dashboard and potentially inaccurate tire pressure readings.

What could cause the C2125 code to trigger?

Causes may include a malfunctioning tire pressure sensor, a dead battery in the tire sensor, damaged wiring, or issues with the TPMS control module.

How can I diagnose the C2125 code?

To diagnose the C2125 code, use an OBDII scanner to confirm the code and check each tire pressure sensor's functionality, inspect wiring for damage, and ensure the TPMS module is working properly.

What should I check first if I encounter the C2125 code?

Start by checking the battery life of the tire pressure sensor associated with ID 5, as a dead battery is a common cause for this code.

Can I reset the C2125 code myself?

Yes, you can reset the code using an OBDII scanner, but it's important to address the underlying issue before doing so to prevent the code from reappearing.

Is it safe to drive with the C2125 code?

While it may be safe to drive, it is advised to address the issue promptly as inaccurate tire pressure readings can affect vehicle safety and performance.

What are some common repair solutions for the C2125 code?

Common repairs may include replacing the faulty tire pressure sensor, installing a new battery in the sensor, or fixing any damaged wiring associated with the TPMS.

How much does it typically cost to fix the C2125 code?

Repair costs can vary widely, but expect to spend anywhere from $50 to $200 for a tire pressure sensor replacement, depending on the vehicle and labor costs.

Can a tire rotation affect the C2125 code?

Yes, if the tire sensors are not properly reprogrammed or reset after a tire rotation, it may lead to this code appearing due to a mismatch in the sensor IDs.