AutoCodes – GMC – B2722 GMC

B2722 GMC 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: B2722 GMC 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 1,730

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 B2722 GMC 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 B2722 GMC - PASS-Key Detection Circuit - AutoCodes.com — B2722 GMC Code - PASS-Key Detection Circuit

What does this mean?

What are the Possible Causes of the DTC B2722 GMC?

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

How to Fix the DTC B2722 GMC?

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 B2722 GMC 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 B2722 GMC Code

1. What are the common symptoms of OBDII code B2722 GMC PASS-Key Detection Circuit?

The common symptoms include issues with starting the vehicle, intermittent stalling, and the security light staying illuminated.

2. What are the possible causes of OBDII code B2722 GMC PASS-Key Detection Circuit?

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

3. How can I diagnose the OBDII code B2722 GMC PASS-Key Detection Circuit?

Diagnosis typically involves checking the ignition key for damage, inspecting the wiring in the PASS-Key system, and using a scanner to retrieve the specific trouble code.

4. Can I repair OBDII code B2722 GMC PASS-Key Detection Circuit myself?

Depending on the cause, some repairs can be done by DIY enthusiasts, such as replacing a faulty ignition key or addressing wiring issues. More complex repairs may require professional assistance.

5. Is it safe to drive with OBDII code B2722 GMC PASS-Key Detection Circuit?

It is not recommended to drive with this code unresolved, as it can lead to potential issues with starting and operating the vehicle.

6. How much does it typically cost to repair OBDII code B2722 GMC PASS-Key Detection Circuit?

The cost of repair can vary widely depending on the specific cause of the code and whether you choose to address it yourself or take it to a mechanic. Costs may range from a few dollars for a new key to several hundred dollars for more extensive repairs.

7. Are there any temporary fixes for OBDII code B2722 GMC PASS-Key Detection Circuit?

Temporary fixes may include resetting the system by disconnecting the battery, but it is important to address the root cause of the code to prevent further issues.

8. Can a low battery trigger OBDII code B2722 GMC PASS-Key Detection Circuit?

A low battery can potentially trigger this code due to voltage fluctuations affecting the PASS-Key system. Ensuring your battery is in good condition can help prevent such issues.

9. How long does it typically take to repair OBDII code B2722 GMC PASS-Key Detection Circuit?

The repair time can vary based on the cause of the code and the complexity of the repair. Simple fixes like replacing a key may take a short time, while more involved repairs can take several hours or more.

10. Will OBDII code B2722 GMC PASS-Key Detection Circuit cause permanent damage to my vehicle if left unresolved?

Leaving this code unresolved can lead to more serious issues over time, such as complete failure to start the vehicle. It is advisable to address the code promptly to avoid potential damage.