AutoCodes – Generic – C2171

C2171 Code - Transmitter ID not Registered

Quick Answer

The IDs of each tire pressure warning valve and transmitter are registered to the Tire Pressure Warning ECU and Receiver. Common causes include 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: C2171 indicates Transmitter ID not Registered.
Common causes: Common causes include 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 1,129

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 21, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C2171 Description

The IDs of each tire pressure warning valve and transmitter are registered to the Tire Pressure Warning ECU and Receiver. When the Tire Pressure Warning ECU and Receiver detect that a transmitter ID code is not registered in the ECU, a Diagnostic Trouble Code (DTC) is output.

OBDII Code C2171 - Transmitter ID not Registered - AutoCodes.com — C2171 Code - Transmitter ID not Registered

What does this mean?

What are the Possible Causes of the DTC C2171?

Faulty Tire Pressure Warning ECU and Receiver

How to Fix the DTC C2171?

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 C2171 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.

Need more information about the C2171 code?

Need more information on how to fix the C2171 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C2171 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C2171 Lexus — Transmitter ID not Registered
C2171 Scion — Transmitter ID not Registered
C2171 Toyota — Transmitter ID not Registered

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 C2171 Code

1. What are the common symptoms of OBDII code C2171 (Transmitter ID not Registered)?

- Common symptoms include the tire pressure monitoring system (TPMS) warning light staying on, inaccurate tire pressure readings, and a message indicating TPMS malfunction.

2. What are the possible causes of OBDII code C2171 (Transmitter ID not Registered)?

- Possible causes include faulty tire pressure sensors, low sensor battery voltage, sensor signal interference, incorrect sensor placement, or a malfunctioning TPMS module.

3. How can I diagnose the cause of OBDII code C2171 (Transmitter ID not Registered)?

- Diagnosis involves using a TPMS tool to check sensor IDs, sensor battery voltage, sensor signal strength, and communication with the TPMS module. Visually inspecting the sensors and their placement is also important.

4. Can I reset OBDII code C2171 (Transmitter ID not Registered) without fixing the underlying issue?

- Resetting the code without addressing the root cause will not resolve the TPMS problem. It's essential to diagnose and fix the issue to ensure proper TPMS functionality.

5. How do I repair OBDII code C2171 (Transmitter ID not Registered)?

- Repair options include replacing faulty tire pressure sensors, ensuring proper sensor placement and tightness, replacing sensor batteries if needed, and recalibrating the TPMS system.

6. Are there any DIY tips for addressing OBDII code C2171 (Transmitter ID not Registered)?

- DIY tips include checking tire pressure regularly, ensuring correct sensor placement during tire changes, and using a TPMS tool to monitor sensor IDs and battery levels.

7. Can driving with OBDII code C2171 (Transmitter ID not Registered) cause any safety concerns?

- Driving with a malfunctioning TPMS system due to this code can compromise tire pressure monitoring accuracy, potentially leading to unsafe driving conditions. It's important to address the issue promptly.

8. How long does it typically take to repair OBDII code C2171 (Transmitter ID not Registered)?

- The repair time can vary depending on the exact cause of the issue. Simple fixes like sensor battery replacement may take a short time, while more complex issues could require more extensive troubleshooting.

9. Will OBDII code C2171 (Transmitter ID not Registered) cause my vehicle to fail an emissions test?

- This code is related to the TPMS system and is unlikely to cause an emissions test failure. However, it should still be addressed to ensure proper tire pressure monitoring functionality.

10. Is it necessary to visit a mechanic for OBDII code C2171 (Transmitter ID not Registered) or can I fix it myself?

- Depending on your experience and tools available, you may be able to diagnose and repair the issue yourself. However, if you are unsure or the problem persists, consulting a mechanic or tire service professional is recommended.