C2172 Code - Transmitter ID Not Registered In 2nd Mode
Quick Answer
The diagnostic trouble code C2172 indicates that the transmitter ID is not registered in the 2nd mode. Common causes include Faulty transmitter battery, Transmitter signal interference, Transmitter programming error. 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 transmitter battery, Transmitter signal interference, Transmitter programming error.
- 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 C2172 Description
The diagnostic trouble code C2172 indicates that the transmitter ID is not registered in the 2nd mode. In modern vehicles, transmitters are used for keyless entry, remote start, and other functions. The transmitter ID is a unique identifier assigned to each transmitter in order to communicate with the vehicle's onboard computer system. When the transmitter ID is not registered in the 2nd mode, it means that the vehicle is unable to recognize the transmitter, leading to issues with keyless entry, remote start, and other related functions.
Common Causes of C2172
- Faulty transmitter battery
- Transmitter signal interference
- Transmitter programming error
- Vehicle's onboard computer malfunction
- Wiring or connection issues between the transmitter and the vehicle's computer system
Symptoms of C2172
- Inability to unlock or lock the vehicle using the transmitter
- Remote start feature not working
- Warning light on the dashboard indicating a keyless entry system fault
- Intermittent issues with starting the vehicle remotely
- Security alarm system may be triggered unexpectedly
How to Fix C2172
- Check the transmitter battery: Start by replacing the transmitter battery to ensure it is not the cause of the issue.
- Reprogram the transmitter: If the transmitter is still not registering, reprogram the transmitter to communicate with the vehicle's computer system.
- Check for signal interference: Ensure that there is no signal interference affecting the communication between the transmitter and the vehicle.
- Inspect wiring and connections: Check the wiring and connections between the transmitter and the vehicle's computer system for any damage or loose connections.
- Reset the vehicle's computer system: If all else fails, resetting the vehicle's computer system may resolve the issue and allow for the proper registration of the transmitter ID.
Cost to Fix C2172
The typical repair costs for addressing the C2172 code can vary depending on the specific cause of the issue. In general, the cost of replacing a transmitter battery is relatively low, usually ranging from $5 to $20. Reprogramming the transmitter may cost around $50 to $100, depending on the technician's labor rates. If the issue is related to wiring or connection problems, the repair costs can range from $100 to $300, including parts and labor. It is advisable to consult with a professional technician to get an accurate estimate based on the specific diagnosis and repair needed for your vehicle. Keep in mind that labor rates at auto repair shops can vary, so it's essential to inquire about the rates in your area for a more precise cost estimate.
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Code C2172 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.
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