AutoCodes – Generic – B2722

B2722 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 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 2,358

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

What does this mean?

What are the Possible Causes of the DTC B2722?

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

How to Fix the DTC B2722?

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 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 B2722 code?

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

Need Help with the Code?

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

Information for Specific Makes

B2722 Buick — PASS-Key Detection Circuit
B2722 Cadillac — PASS-Key Detection Circuit
B2722 Chevrolet — PASS-Key Detection Circuit
B2722 Chrysler — Occupant Restraint Controller Unlocked All Deployment Disabled
B2722 Dodge — Occupant Restraint Controller Unlocked All Deployment Disabled
B2722 GMC — PASS-Key Detection Circuit
B2722 Infiniti — Rear Sonar Sensor Right Inner
B2722 Jeep — Occupant Restraint Controller Unlocked All Deployment Disabled
B2722 Nissan — Rear Sonar Sensor Right Inner
B2722 RAM — Occupant Restraint Controller Unlocked All Deployment Disabled

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 Code

1. What does OBDII code B2722 mean?

Code B2722 indicates a problem in the PASS-Key detection circuit, which is part of the vehicle's anti-theft system.

2. What are the symptoms of a B2722 code?

Common symptoms include the engine failing to start, the security light staying illuminated, or intermittent starting issues.

3. What causes a B2722 code to appear?

This code can be caused by a faulty ignition key, a damaged ignition lock cylinder, a malfunctioning PASS-Key module, or wiring/connectivity issues in the detection circuit.

4. How can I diagnose a B2722 code?

Start by checking the ignition key for damage, inspecting the ignition lock cylinder, testing the PASS-Key module, and verifying the wiring connections for continuity and proper function.

5. Can a damaged ignition key trigger a B2722 code?

Yes, a damaged or worn ignition key that cannot be properly read by the PASS-Key system can trigger this code.

6. Is it safe to drive with a B2722 code?

No, driving may not be possible as this code often prevents the engine from starting due to the anti-theft system being triggered.

7. How do I fix a B2722 code?

Repairs may involve replacing the ignition key, repairing the ignition lock cylinder, replacing the PASS-Key module, or fixing damaged wiring in the detection circuit.

8. Can a weak battery cause a B2722 code?

While unlikely, a weak or failing battery can sometimes cause communication issues in the PASS-Key system, leading to this code.

9. Do I need to reprogram the key after fixing a B2722 code?

If a new key or module is installed, reprogramming the key to the vehicle's anti-theft system may be required. Consult your vehicle's service manual or a professional.

10. How much does it cost to fix a B2722 code?

The repair cost can vary, ranging from $50-$300 for a new key or cylinder replacement to $500 or more if the PASS-Key module needs replacement or extensive wiring repairs.