Engine-Codes.com
Engine-Codes – Toyota – C2172 Toyota

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

Quick Answer

The C2172 diagnostic trouble code for Toyota vehicles indicates that the transmitter ID is not registered in the 2nd mode. Common causes include Faulty key fob or transmitter, Weak or dead battery in the key fob, Malfunctioning immobilizer system. 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 key fob or transmitter, Weak or dead battery in the key fob, Malfunctioning immobilizer system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code C2172 Toyota Description

The C2172 diagnostic trouble code for Toyota vehicles indicates that the transmitter ID is not registered in the 2nd mode. In simpler terms, this means that the vehicle's key fob or remote transmitter is not being recognized by the vehicle's immobilizer system when attempting to start the engine. The immobilizer system is a security feature that prevents the engine from starting without the correct key or transmitter signal.

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

Common Causes of C2172 Toyota

  1. Faulty key fob or transmitter
  2. Weak or dead battery in the key fob
  3. Malfunctioning immobilizer system
  4. Communication error between key fob and vehicle's onboard computer

Symptoms of C2172 Toyota

  1. Engine not starting
  2. Vehicle stalling unexpectedly
  3. Immobilizer warning light illuminated on the dashboard
  4. Key fob not working to unlock or lock the vehicle

How to Fix C2172 Toyota

  1. Replace the battery in the key fob: Start by replacing the battery in the key fob to ensure that it is transmitting a strong signal to the vehicle's immobilizer system.
  2. Reprogram the key fob: If replacing the battery does not resolve the issue, the key fob may need to be reprogrammed to sync with the vehicle's immobilizer system.
  3. Check immobilizer system: Have the immobilizer system checked by a professional to determine if there are any faults or malfunctions that need to be addressed.
  4. Replace key fob: If the key fob is found to be faulty, it may need to be replaced with a new one to ensure proper functioning.
  5. Clear the trouble code: Once the issue has been resolved, clear the trouble code from the vehicle's onboard computer to reset the system.

Cost to Fix C2172 Toyota

The typical repair costs for addressing the C2172 code can vary depending on the specific cause of the issue. Replacing the battery in the key fob may cost around $5-$10, while reprogramming the key fob or replacing it entirely can range from $50-$200. Having the immobilizer system checked by a professional may cost between $100-$200. Overall, the total repair costs for this issue could range from $100-$400, including parts and labor. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and labor rates at auto repair shops.

Need more information about the C2172 Toyota code?

Need more information on how to fix the C2172 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C2172 Toyota 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 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.

Discuss the causes and fixes for C2172 Toyota OBDII Code

Submit a New Comment

Code C2172 Toyota comments

No comments found for this page.