AutoCodes – Buick – B3123 Buick

B3123 Buick 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 Buick 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 956

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

What does this mean?

What are the Possible Causes of the DTC B3123 Buick?

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 Buick?

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 Buick 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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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 Buick Code

1. What does the OBDII code B3123 mean on a Buick?

B3123 indicates an issue with Keyless Entry Antenna 5, which is responsible for receiving signals from the key fob in a specific area of the vehicle.

2. What are the common symptoms of the B3123 code?

Symptoms may include the keyless entry system not working in certain areas of the vehicle, difficulty locking/unlocking doors, or intermittent response from the key fob.

3. What causes the B3123 code to trigger?

The code can be caused by a faulty antenna, damaged wiring or connectors, interference from other electronic devices, or a malfunction in the keyless entry module.

4. How do I diagnose the B3123 code?

Start by scanning for codes with an OBDII scanner, inspect the Keyless Entry Antenna 5 for physical damage, check for broken or corroded wiring, and test the antenna signal with specialized diagnostic tools.

5. Can a weak key fob battery cause the B3123 code?

While a weak key fob battery can cause keyless entry issues, it is unlikely to trigger the B3123 code specifically. However, replacing the key fob battery is a good first step in troubleshooting.

6. How do I fix the B3123 code on my Buick?

Repairs may involve replacing the faulty Keyless Entry Antenna 5, repairing damaged wiring or connectors, or reprogramming the keyless entry system if necessary.

7. Where is Keyless Entry Antenna 5 located in a Buick?

The exact location varies by model, but it is typically found in areas such as the rear quarter panel, trunk, or near the vehicleâ€™s interior. Consult your service manual for the specific location.

8. Can I drive with the B3123 code active?

Yes, you can drive with the B3123 code active, but the keyless entry system may not function properly, which could be inconvenient.

9. Does the B3123 code require professional repair?

If basic troubleshooting like checking wiring and connectors doesn't resolve the issue, itâ€™s recommended to seek professional repair to avoid damaging the keyless entry system.

10. Will clearing the B3123 code fix the problem?

Clearing the code may temporarily reset the system, but the underlying issue with Keyless Entry Antenna 5 must be addressed to prevent the code from returning.