C2172 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 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.
Code C2172 Description
What are the Possible Causes of the DTC C2172?
- 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?
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 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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Information for Specific Makes
- C2172 Lexus — Transmitter ID Not Registered In 2nd Mode
- C2172 Scion — Transmitter ID Not Registered In 2nd Mode
- C2172 Toyota — Transmitter ID Not Registered In 2nd Mode
Frequently Asked Questions about C2172 Code
1. What does OBDII code C2172 mean?
C2172 indicates that the transmitter ID of a tire pressure monitoring system (TPMS) sensor is not registered in the vehicle’s second mode, leading to a malfunction in the system.
2. What are the common symptoms of code C2172?
Symptoms include the TPMS warning light illuminating, incorrect tire pressure readings, or failure to display any tire pressure information.
3. What causes the C2172 code to appear?
The code can be caused by an unprogrammed or replaced TPMS sensor, interference during the ID registration process, or a malfunction in the TPMS control module.
4. How can I fix OBDII code C2172?
Reprogram or register the transmitter ID of the affected TPMS sensor using a TPMS tool or scan tool specific to your vehicle’s make and model.
5. Can a dead TPMS sensor battery cause code C2172?
Yes, a dead TPMS sensor battery can prevent the sensor from transmitting its ID, triggering the C2172 code.
6. Is replacing the TPMS sensor always necessary to fix code C2172?
No, replacing the sensor is not always necessary; reprogramming or re-registering the existing sensor ID often resolves the issue.
7. Can a C2172 code be cleared without fixing the issue?
You can clear the code temporarily, but it will likely return if the transmitter ID is not properly registered or the underlying issue is not resolved.
8. What tools are needed to fix code C2172?
You’ll need a TPMS scan tool or a compatible diagnostic scanner to register or program the transmitter ID.
9. Does a tire rotation trigger code C2172?
It can, if the TPMS sensor IDs are not reprogrammed or relearned after the tire rotation.
10. Can I drive with the C2172 code active?
Yes, but the TPMS system may not function correctly, which could prevent you from receiving accurate tire pressure warnings.
Discuss the causes and fixes for C2172 OBDII Code
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