AutoCodes – Lexus – C2172 Lexus

C2172 Lexus 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 Lexus 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 12,969

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C2172 Lexus 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 Lexus - Transmitter ID Not Registered In 2nd Mode - AutoCodes.com — C2172 Lexus Code - Transmitter ID Not Registered In 2nd Mode

What does this mean?

What are the Possible Causes of the DTC C2172 Lexus?

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 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 C2172 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.

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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 Lexus Code

1. What are the common symptoms of OBDII code C2172 in a Lexus related to "Transmitter ID Not Registered In 2nd Mode"?

- The common symptoms include issues with keyless entry, difficulty starting the vehicle, and warning lights on the dashboard.

2. What could be causing the OBDII code C2172 to trigger in a Lexus?

- The code C2172 can be triggered due to a faulty key fob, problems with the vehicle's immobilizer system, or issues with the communication between the key fob and the vehicle.

3. How can I diagnose the cause of the OBDII code C2172 in my Lexus?

- To diagnose the issue, you can try using a different key fob, checking the key fob battery, inspecting the vehicle's immobilizer system, and scanning for other related trouble codes.

4. Are there any DIY repair tips for fixing the "Transmitter ID Not Registered In 2nd Mode" issue in a Lexus?

- DIY repair tips include replacing the key fob battery, reprogramming the key fob, checking and repairing any loose wiring connections, and resetting the vehicle's immobilizer system.

5. Can a professional automotive technician help with resolving the OBDII code C2172 in a Lexus?

- Yes, a professional technician can use specialized diagnostic equipment to pinpoint the exact cause of the issue, perform key fob reprogramming, and ensure proper communication between the key fob and the vehicle.

6. What are the potential risks of ignoring the OBDII code C2172 related to "Transmitter ID Not Registered In 2nd Mode" in a Lexus?

- Ignoring the code may lead to continued issues with keyless entry, starting the vehicle, and potential immobilization of the vehicle if the problem worsens.

7. Is it safe to continue driving my Lexus with the OBDII code C2172 present?

- It is generally not recommended to drive the vehicle with unresolved OBDII codes, as they can indicate underlying issues that may affect the vehicle's performance and safety.

8. How much does it typically cost to repair the "Transmitter ID Not Registered In 2nd Mode" issue in a Lexus?

- The repair cost can vary depending on the exact cause of the problem, but it may involve expenses for key fob replacement, reprogramming, or immobilizer system repair, ranging from a few hundred to a few thousand dollars.

9. Can weather conditions or environmental factors trigger the OBDII code C2172 in a Lexus?

- Extreme weather conditions or environmental factors such as electromagnetic interference can potentially affect the communication between the key fob and the vehicle, leading to the triggering of the code C2172.

10. How can I prevent the recurrence of the OBDII code C2172 related to "Transmitter ID Not Registered In 2nd Mode" in my Lexus?

- To prevent the issue from happening again, regularly check the key fob battery, keep the key fob and vehicle away from strong electromagnetic sources, and ensure proper maintenance of the vehicle's immobilizer system.