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C2123 Subaru Code - Transmitter 3 No Data

Quick Answer

The C2123 code for Subaru vehicles specifically refers to an issue with Transmitter 3 No Data. Common causes include Faulty transmitter, Weak transmitter battery, Interference with the transmitter signal. 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
C2123 Subaru indicates Transmitter 3 No Data.
Common causes
Common causes include Faulty transmitter, Weak transmitter battery, Interference with the transmitter signal.
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 11, 2024
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Code C2123 Subaru Description

The C2123 code for Subaru vehicles specifically refers to an issue with Transmitter 3 No Data. This code typically indicates a problem with the communication between the transmitter and the vehicle's systems. The transmitter is an essential component of the vehicle's keyless entry system, which allows the driver to remotely lock and unlock the doors, as well as start the engine.

OBDII Code C2123 Subaru - Transmitter 3 No Data
C2123 Subaru Code - Transmitter 3 No Data

Common Causes of C2123 Subaru

  1. Faulty transmitter
  2. Weak transmitter battery
  3. Interference with the transmitter signal
  4. Wiring or connection issues with the transmitter
  5. Faulty receiver module in the vehicle

Symptoms of C2123 Subaru

  1. Keyless entry system not working
  2. Inability to start the engine remotely
  3. Doors not locking or unlocking remotely
  4. Warning light on the dashboard indicating a keyless entry system fault

How to Fix C2123 Subaru

  1. Replace the transmitter battery: Start by replacing the battery in Transmitter 3 to ensure that it is providing a strong signal to the vehicle.
  2. Check transmitter signal: Verify that the transmitter is sending a signal properly and that there is no interference affecting the communication with the vehicle.
  3. Inspect wiring and connections: Check the wiring and connections related to the transmitter to ensure there are no loose or damaged components.
  4. Replace transmitter: If the transmitter itself is faulty, it may need to be replaced to resolve the issue.
  5. Reset keyless entry system: In some cases, resetting the keyless entry system can help reestablish communication between the transmitter and the vehicle.

Cost to Fix C2123 Subaru

The cost of repairing a C2123 code for a Subaru vehicle can vary depending on the specific issue causing the code and the labor rates at the auto repair shop. In general, replacing a transmitter battery or resetting the keyless entry system may cost around $50-$100. However, if the issue requires replacing the transmitter or addressing wiring problems, the cost can range from $100-$300 or more. It is recommended to consult with a professional technician for an accurate estimate based on the specific diagnosis of the vehicle.

What does this mean?

Tech Notes for C2123 Subaru

When the low tire pressure warning light illuminates, immediately check the air pressure of all tires and adjust to the specified pressure. After adjusting air pressure, drive the vehicle at 25 mph (40 km/h) or more to start TPM system re-checking of the tire inflation pressures. Warning light should turn off in a few minutes.

If the warning light is still on after adjusting tire pressure, check for a damaged tire and repair as necessary. If warning light blinks 25 times and then illuminates, and there is not a tire without a tire pressure sensor installed, there is a malfunction in the TPM system. See appropriate manufacturer service information.

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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 C2123 Subaru Code

1. What are the common symptoms of OBDII code C2123 in a Subaru related to Transmitter 3 No Data?

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

2. What can cause the OBDII code C2123 in a Subaru indicating Transmitter 3 No Data?

- The code C2123 can be caused by a faulty key fob transmitter, a problem with the receiver unit, or issues with the wiring and connections.

3. How can I diagnose the OBDII code C2123 in my Subaru related to Transmitter 3 No Data?

- To diagnose this code, you can start by checking the battery in the key fob, ensuring it is transmitting signals, inspecting the receiver unit, and examining the wiring for any damage.

4. Are there any quick fixes for OBDII code C2123 in a Subaru?

- A quick fix could involve replacing the battery in the key fob, reprogramming the key fob, or checking and securing any loose wiring connections.

5. Can I continue to drive my Subaru with the OBDII code C2123 related to Transmitter 3 No Data?

- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent potential problems with starting the vehicle or the keyless entry system.

6. How much does it typically cost to repair OBDII code C2123 in a Subaru?

- The cost of repair can vary depending on the root cause of the issue, but it may range from replacing the key fob battery to more extensive repairs involving the receiver unit or wiring.

7. Will resetting the OBDII code C2123 in my Subaru make it go away permanently?

- Resetting the code may temporarily clear it, but if the underlying issue such as a faulty key fob or wiring problem is not addressed, the code is likely to reappear.

8. Is it possible to prevent OBDII code C2123 related to Transmitter 3 No Data in my Subaru?

- Regularly checking the condition of the key fob, replacing the battery when needed, and ensuring proper maintenance of the keyless entry system can help prevent this code from occurring.

9. Can a DIY enthusiast fix OBDII code C2123 in a Subaru?

- Depending on the cause of the code, some DIY enthusiasts may be able to address the issue by replacing the key fob battery or checking and securing wiring connections. However, more complex problems may require professional assistance.

10. How long does it usually take to repair OBDII code C2123 in a Subaru?

- The repair time can vary based on the specific cause of the issue. Simple fixes like replacing the key fob battery can be done quickly, while more involved repairs may take longer, potentially a few hours to a day.

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