AutoCodes – Toyota – C2172 Toyota

C2172 Toyota Code - Transmitter ID Not Registered In 2nd Mode

Quick Answer

The IDs of each tire pressure warning valve and transmitter are registered to the Tire Pressure Warning ECU. Common causes include Faulty Tire Pressure Warning ECU, Tire Pressure Warning ECU harness is open or shorted, Tire Pressure Warning ECU circuit poor electrical connection. 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
C2172 Toyota indicates Transmitter ID Not Registered In 2nd Mode.
Common causes
Common causes include Faulty Tire Pressure Warning ECU, Tire Pressure Warning ECU harness is open or shorted, Tire Pressure Warning ECU circuit poor electrical connection.
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 2,788
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code C2172 Toyota Description

The IDs of each tire pressure warning valve and transmitter are registered to the Tire Pressure Warning ECU. When the ECU detects that an ID is not one of the registered IDs, or cannot receive an ID signal, a Diagnostic Trouble Code (DTC) is output.
OBDII Code C2172 Toyota - Transmitter ID Not Registered In 2nd Mode - AutoCodes.com
C2172 Toyota Code - Transmitter ID Not Registered In 2nd Mode

What are the Possible Causes of the DTC C2172 Toyota?

  • Faulty Tire Pressure Warning ECU
  • Tire Pressure Warning ECU harness is open or shorted
  • Tire Pressure Warning ECU circuit poor electrical connection

How to Fix the DTC C2172 Toyota?

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 C2172 Toyota 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 C2172 Toyota Code

1. What are the common symptoms of OBDII code C2172 in a Toyota vehicle?

- Common symptoms include issues with the tire pressure monitoring system (TPMS), warning lights on the dashboard, and difficulty in detecting tire pressure.

2. What does the OBDII code C2172 "Transmitter ID Not Registered In 2nd Mode" mean in a Toyota?

- This code indicates that the TPMS sensor transmitter ID is not communicating properly with the vehicle's system when in 2nd mode.

3. What are the possible causes of OBDII code C2172 in a Toyota?

- Possible causes include faulty TPMS sensor, low sensor battery, TPMS sensor not programmed correctly, or issues with the TPMS receiver.

4. How can I diagnose the OBDII code C2172 in my Toyota?

- Diagnosis involves checking the TPMS sensor batteries, verifying proper sensor programming, inspecting for physical sensor damage, and ensuring the sensors are within range of the vehicle.

5. Can I drive my Toyota with the OBDII code C2172 present?

- It is generally safe to drive with this code, but it is important to address the TPMS issue promptly to ensure proper tire pressure monitoring.

6. How do I repair OBDII code C2172 in my Toyota?

- Repair options include replacing the faulty TPMS sensor, reprogramming the sensor IDs, ensuring proper sensor placement, and resetting the TPMS system.

7. Is it possible to reset the OBDII code C2172 in a Toyota without professional help?

- You can attempt to reset the code by using an OBDII scanner to clear the code after resolving the TPMS issue that triggered it.

8. How much does it typically cost to repair OBDII code C2172 in a Toyota?

- The cost of repair can vary depending on the specific issue, but it may range from $50 to $200 for a single TPMS sensor replacement.

9. Can weather conditions affect the triggering of OBDII code C2172 in a Toyota?

- Extreme temperatures or pressure changes can sometimes cause TPMS sensor malfunctions, which may lead to the triggering of this code.

10. How often should I check the TPMS sensors in my Toyota to prevent OBDII code C2172 from occurring?

- It is recommended to check the TPMS sensors during regular tire maintenance, such as when rotating tires or checking tire pressure, to prevent issues that could trigger this code.

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