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Engine-Codes – Scion – C2171 Scion

C2171 Scion Code - Transmitter ID not Registered

Quick Answer

The C2171 code for Scion vehicles indicates that the transmitter ID is not registered. Common causes include Faulty transmitter, Receiver issue in the vehicle, Communication problem between transmitter 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 Scion indicates Transmitter ID not Registered.
Common causes
Common causes include Faulty transmitter, Receiver issue in the vehicle, Communication problem between transmitter 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code C2171 Scion Description

The C2171 code for Scion vehicles indicates that the transmitter ID is not registered. In modern vehicles, transmitters are used for keyless entry, remote start, and other functions. When the transmitter ID is not registered, it means that the vehicle's computer system is not recognizing the signal from the transmitter, which can lead to various issues with the vehicle's systems.

OBDII Code C2171 Scion - Transmitter ID not Registered
C2171 Scion Code - Transmitter ID not Registered

Common Causes of C2171 Scion

  1. Faulty transmitter
  2. Receiver issue in the vehicle
  3. Communication problem between transmitter and receiver
  4. Wiring issue
  5. Computer system malfunction

Symptoms of C2171 Scion

  1. Keyless entry not working
  2. Remote start not functioning
  3. Vehicle not starting
  4. Security system malfunctions
  5. Warning light on the dashboard

How to Fix C2171 Scion

  1. Check the transmitter battery and replace if necessary.
  2. Re-register the transmitter ID with the vehicle's computer system.
  3. Inspect the receiver in the vehicle for any damage or malfunctions.
  4. Check the wiring for any loose connections or damage.
  5. If needed, reprogram the vehicle's computer system to recognize the transmitter ID.

Cost to Fix C2171 Scion

The typical repair costs for addressing a C2171 code on a Scion vehicle can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty transmitter or reprogramming the vehicle's computer system can range from $100 to $300. Additional costs may be incurred if there are wiring issues or damage to the receiver that needs to be addressed. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 C2171 Scion Code

1. What does the OBDII code C2171 mean on a Scion?

C2171 indicates that the vehicle's system has detected a "Transmitter ID not Registered," usually related to the Tire Pressure Monitoring System (TPMS).

2. What are the common symptoms of the C2171 code?

Symptoms include the TPMS warning light illuminating on the dashboard and possibly no real-time tire pressure readings on the vehicle's display.

3. What causes the C2171 code to appear?

The code is often caused by unregistered or mismatched TPMS sensor IDs, a dead TPMS sensor battery, or interference during sensor registration.

4. How do I fix the C2171 code on my Scion?

You need to register the TPMS sensor IDs to the vehicle's ECU using a TPMS programming tool or scan tool. Replace faulty sensors if needed.

5. Can I drive with the C2171 code active?

Yes, but the TPMS system will not function properly, meaning you won't be alerted to low tire pressure, which could be a safety issue.

6. How is the C2171 code diagnosed?

A technician will use a TPMS scan tool to check the sensor IDs, verify their status, and reprogram or replace any malfunctioning sensors.

7. Do I need to replace all TPMS sensors if I get the C2171 code?

No, only replace the sensor(s) with dead batteries or that cannot be registered. Sometimes reprogramming the existing sensors is sufficient.

8. Can a battery replacement in a TPMS sensor clear the C2171 code?

Yes, if the sensor battery was the issue. However, the sensor will still need to be re-registered to the vehicle after replacement.

9. What tools are needed to resolve the C2171 code?

A TPMS scan tool, OBDII scanner, or a compatible programming device is needed to register or reprogram the sensors.

10. How much does it cost to fix the C2171 code?

Costs can vary. Reprogramming sensors typically costs $50–$100 at a shop, while sensor replacements range from $50–$150 per sensor, plus labor.

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