AutoCodes – Generic – B3123

B3123 Code - Keyless Entry Antenna 5

Quick Answer

The rear center console antenna is located in rear of the center console assembly and is used to establish low frequency communications with the keyless entry transmitter. Common causes include Faulty Keyless Entry Antenna Center Console Rear, Keyless Entry Antenna Center Console Rear harness is open or shorted, Keyless Entry Antenna Center Console Rear 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: B3123 indicates Keyless Entry Antenna 5.
Common causes: Common causes include Faulty Keyless Entry Antenna Center Console Rear, Keyless Entry Antenna Center Console Rear harness is open or shorted, Keyless Entry Antenna Center Console Rear 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.

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Code Popularity 3,300

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 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3123 Description

The rear center console antenna is located in rear of the center console assembly and is used to establish low frequency communications with the keyless entry transmitter. When the driver attempts to change the ignition status of the vehicle, the Keyless Entry Control Module communicates with the rear center console antenna. The Diagnostic Trouble Code (DTC) sets when the keyless entry control module detects a short to ground on the rear center console keyless entry antenna signal circuit.

OBDII Code B3123 - Keyless Entry Antenna 5 - AutoCodes.com — B3123 Code - Keyless Entry Antenna 5

What does this mean?

What are the Possible Causes of the DTC B3123?

Faulty Keyless Entry Antenna Center Console Rear
Keyless Entry Antenna Center Console Rear harness is open or shorted
Keyless Entry Antenna Center Console Rear circuit poor electrical connection
Faulty Keyless Entry Control Module

How to Fix the DTC B3123?

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 B3123 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 B3123 code?

Need more information on how to fix the B3123 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3123 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3123 Buick — Keyless Entry Antenna 5
B3123 Cadillac — Keyless Entry Antenna 5
B3123 Chevrolet — Keyless Entry Antenna 5
B3123 GMC — Keyless Entry Antenna 5

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 B3123 Code

1. What does OBDII code B3123 mean?

B3123 indicates an issue with Keyless Entry Antenna 5, which may involve a malfunction in the antenna responsible for receiving signals from the key fob.

2. What are common symptoms of code B3123?

Symptoms include the keyless entry system not working properly, difficulty unlocking or locking the vehicle with the fob, and possible warning lights or messages on the dashboard.

3. What causes the B3123 code to appear?

The code may be caused by a damaged or faulty antenna, wiring issues, a disconnected antenna, or interference from nearby electronic devices.

4. How can I diagnose code B3123?

Start by visually inspecting the Keyless Entry Antenna 5 and its wiring for damage or disconnection. Use a scan tool to confirm the fault and test the antennaâ€™s functionality with a multimeter.

5. Can I still drive my car with code B3123 active?

Yes, you can drive the vehicle, but the keyless entry system may not function properly, which could be inconvenient or unsafe in certain situations.

6. How is code B3123 typically fixed?

Repairs may involve replacing the faulty Keyless Entry Antenna 5, repairing damaged wiring, or securely reconnecting the antenna if it has become disconnected.

7. How much does it cost to fix code B3123?

Repair costs vary but typically range from $100 to $300 depending on whether the antenna needs replacement or if the issue is with wiring.

8. Can I fix the B3123 code myself?

If you have basic automotive knowledge, you can inspect and possibly replace the antenna or repair the wiring, but more complex issues may require professional help.

9. What tools are needed to resolve code B3123?

Youâ€™ll need a scan tool to confirm the code, a multimeter to test the antenna, and possibly basic hand tools to access and replace components.

10. Can interference cause the B3123 code?

Yes, electronic interference from other devices or signals can sometimes affect the keyless entry system, so try operating the system in a different environment to rule out interference.