AutoCodes – Chevrolet – B2722 Chevrolet

B2722 Chevrolet 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 Chevrolet 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 7,220

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

What does this mean?

What are the Possible Causes of the DTC B2722 Chevrolet?

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

How to Fix the DTC B2722 Chevrolet?

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 Chevrolet 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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Need more information on how to fix the B2722 Chevrolet code? Get Access to Factory Service Manuals

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Get the B2722 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 Chevrolet Code

1. What are common symptoms of OBDII code B2722 in a Chevrolet related to PASS-Key detection circuit?

- Common symptoms include issues with starting the vehicle, intermittent stalling, and the security light staying illuminated on the dashboard.

2. What can cause the OBDII code B2722 in a Chevrolet PASS-Key detection circuit?

- The code B2722 can be triggered by a faulty ignition key, a defective ignition lock cylinder, a failed PASS-Key module, or damaged wiring in the PASS-Key system.

3. How can I diagnose the OBDII code B2722 in a Chevrolet PASS-Key detection circuit?

- Diagnosis involves checking the condition of the ignition key, inspecting the ignition lock cylinder, testing the PASS-Key module, and examining the wiring for any signs of damage.

4. Is it safe to drive my Chevrolet with the OBDII code B2722 related to PASS-Key detection circuit?

- It is not recommended to drive the vehicle with this code as it may lead to starting issues or stalling, which can pose a safety risk. It's best to address the issue promptly.

5. Can I repair the OBDII code B2722 in a Chevrolet PASS-Key detection circuit myself?

- The repair for this code may involve replacing the ignition key, ignition lock cylinder, PASS-Key module, or repairing damaged wiring. It's recommended to seek professional help for accurate diagnosis and repair.

6. How much does it cost to fix the OBDII code B2722 in a Chevrolet PASS-Key detection circuit?

- The cost of repair can vary depending on the specific cause of the code. It's best to get a diagnosis from a mechanic to determine the exact repair needed and associated costs.

7. Are there any preventative measures to avoid triggering the OBDII code B2722 in a Chevrolet PASS-Key detection circuit?

- Keeping the ignition key in good condition, avoiding rough handling or excessive force when starting the vehicle, and regular maintenance of the PASS-Key system can help prevent issues.

8. Can a low battery trigger the OBDII code B2722 in a Chevrolet PASS-Key detection circuit?

- A low battery can potentially cause issues with the PASS-Key system, leading to the code B2722. Ensuring the battery is in good condition and properly charged is important for overall vehicle health.

9. Will resetting the OBDII code B2722 in a Chevrolet PASS-Key detection circuit make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to return. It's important to diagnose and fix the root cause of the problem.

10. How long does it take to repair the OBDII code B2722 in a Chevrolet PASS-Key detection circuit?

- The repair time can vary based on the specific cause of the code and the complexity of the repair needed. It's advisable to consult with a professional technician for an accurate estimate of repair time.