AutoCodes – Generic – B2723

B2723 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 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 3,044

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

What does this mean?

What are the Possible Causes of the DTC B2723?

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

How to Fix the DTC B2723?

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 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 B2723 code?

Need more information on how to fix the B2723 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2723 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2723 Buick — PASS-Key Detection Circuit
B2723 Cadillac — PASS-Key Detection Circuit
B2723 Chevrolet — PASS-Key Detection Circuit
B2723 GMC — PASS-Key Detection Circuit
B2723 Infiniti — Rear Sonar Sensor Right Outer
B2723 Nissan — Rear Sonar Sensor Right Outer

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 Code

1. What are the common symptoms of OBDII code B2723 (PASS-Key Detection Circuit)?

- Common symptoms include difficulty starting the vehicle, the engine not turning over, and the security light on the dashboard staying illuminated.

2. What are the possible causes of OBDII code B2723?

- The code B2723 can be caused by issues with the ignition key, faulty PASS-Key module, damaged wiring in the PASS-Key system, or a malfunctioning ignition switch.

3. How can I diagnose OBDII code B2723?

- Diagnosing code B2723 involves using a scan tool to retrieve the trouble codes, testing the PASS-Key system components for continuity and proper operation, and checking the key resistance.

4. What are some repair tips for fixing OBDII code B2723?

- Repair tips for code B2723 include checking and replacing the ignition key, inspecting and repairing any damaged wiring in the PASS-Key system, testing and replacing the PASS-Key module if necessary, and ensuring proper connections at the ignition switch.

5. Can OBDII code B2723 be fixed without professional help?

- While some DIY enthusiasts may be able to troubleshoot and repair code B2723 on their own, it is recommended to seek professional help, especially if the issue is related to the PASS-Key module or complex wiring problems.

6. Is it safe to continue driving with OBDII code B2723 present?

- It is not recommended to continue driving with code B2723 present, as it may lead to starting issues and potential immobilization of the vehicle in the future.

7. How much does it typically cost to repair OBDII code B2723?

- The cost of repairing OBDII code B2723 can vary depending on the root cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

8. Can OBDII code B2723 cause any other problems in the vehicle?

- In addition to starting issues, OBDII code B2723 can potentially cause the vehicle's security system to malfunction, leading to further complications in starting and operating the vehicle.

9. How long does it take to repair OBDII code B2723?

- The repair time for OBDII code B2723 can vary depending on the complexity of the issue and the availability of parts, but it may take a few hours to half a day to diagnose and fix the problem.

10. Are there any preventive measures to avoid OBDII code B2723 in the future?

- To prevent OBDII code B2723, it is advisable to regularly maintain the ignition key, inspect and repair any wiring issues promptly, and avoid using damaged or aftermarket keys that may not be compatible with the PASS-Key system.