AutoCodes – Buick – B2723 Buick

B2723 Buick Code - PASS-Key Detection Circuit

Quick Answer

The Body Control Module (BCM) supplies a 5 volt signal and a ground circuit for the PASS-KeyÂ® system. Common causes include Faulty Ignition Key, Faulty Ignition Lock Cylinder, Faulty Body Control Module (BCM). 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: B2723 Buick indicates PASS-Key Detection Circuit.
Common causes: Common causes include Faulty Ignition Key, Faulty Ignition Lock Cylinder, Faulty Body Control Module (BCM).
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 1,681

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 Jan 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2723 Buick Description

The Body Control Module (BCM) supplies a 5 volt signal and a ground circuit for the PASS-KeyÂ® system. This allows the BCM to detect PASS-KeyÂ® resistance values. Inserting the PASS-KeyÂ® (with resistor pellet) in the ignition lock cylinder completes the PASS-KeyÂ® circuit. Contacts in the ignition lock cylinder mate with the pellet contacts. The BCM compares the resistance value of the key pellet to the valid resistance programmed into the BCM. If the proper resistance value is read, the BCM allows the following functions to occur: The theft deterrent relay to energize, The steering column to unlock and The BCM sends a message through the serial data line to the Powertrain Control Module (PCM) to enable fuel delivery. If the resistance value is incorrect, a malfunction is present and a DTC will set.

OBDII Code B2723 Buick - PASS-Key Detection Circuit - AutoCodes.com — B2723 Buick Code - PASS-Key Detection Circuit

What does this mean?

What are the Possible Causes of the DTC B2723 Buick?

Faulty Ignition Key
Faulty Ignition Lock Cylinder
Faulty Body Control Module (BCM)

How to Fix the DTC B2723 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 B2723 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 B2723 Buick Code

1. What does the OBDII code B2723 mean on a Buick?

B2723 indicates an issue with the PASS-Key detection circuit, which is part of the vehicle's anti-theft system.

2. What are the common symptoms of code B2723 in a Buick?

Symptoms include the engine not starting, the security light staying on, or intermittent starting issues.

3. What causes the B2723 code to appear on a Buick?

Common causes include a faulty ignition key, damaged wiring in the PASS-Key system, or a malfunctioning ignition lock cylinder.

4. Can a worn ignition key trigger code B2723?

Yes, a worn or damaged ignition key can prevent the PASS-Key system from properly detecting the key, triggering the code.

5. How can I diagnose the B2723 code on my Buick?

Start by inspecting the ignition key and lock cylinder for wear or damage, then check the wiring and connections in the PASS-Key system for continuity or corrosion.

6. Is it safe to drive a Buick with the B2723 code?

No, as this code usually prevents the engine from starting, it needs to be resolved before the vehicle can be driven.

7. How do you fix code B2723 on a Buick?

Repairs may involve replacing a worn ignition key, repairing damaged wiring, or replacing the ignition lock cylinder if itâ€™s faulty.

8. Can a dead battery cause the B2723 code on a Buick?

A dead or weak battery can disrupt the anti-theft system and might cause related issues, but it is not a direct cause of this specific code.

9. Does clearing the B2723 code fix the problem?

Clearing the code may temporarily reset the system, but the underlying issue must be fixed to prevent the code from returning.

10. How much does it cost to repair the B2723 code on a Buick?

Repair costs vary depending on the issue. A new ignition key may cost $50-$150, while replacing the ignition lock cylinder can cost $200-$400, including labor.