AutoCodes – Cadillac – B2722 Cadillac

B2722 Cadillac 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 Cadillac 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 647

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

What does this mean?

What are the Possible Causes of the DTC B2722 Cadillac?

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

How to Fix the DTC B2722 Cadillac?

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 Cadillac 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 Cadillac Code

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

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

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

The possible causes include a faulty ignition key, damaged or malfunctioning PASS-Key sensor, wiring issues in the PASS-Key system, or a defective Body Control Module (BCM).

3. How can I diagnose OBDII code B2722 (Cadillac PASS-Key Detection Circuit)?

Diagnosing this code involves checking the ignition key for damage, inspecting the PASS-Key sensor for proper operation, testing the wiring for continuity and shorts, and scanning the BCM for any related trouble codes.

4. Can I still drive my Cadillac with OBDII code B2722 (PASS-Key Detection Circuit)?

It is not recommended to drive the vehicle with this code present, as it may lead to potential starting issues or a no-start condition in the future.

5. What repairs are typically needed to fix OBDII code B2722 (Cadillac PASS-Key Detection Circuit)?

Repairs may involve replacing a faulty ignition key, repairing or replacing the PASS-Key sensor, repairing damaged wiring in the PASS-Key system, or replacing a defective BCM.

6. Are there any DIY tips for troubleshooting OBDII code B2722 (Cadillac PASS-Key Detection Circuit)?

DIY tips include checking the condition of the ignition key, visually inspecting the PASS-Key sensor for damage, and ensuring all wiring connections in the PASS-Key system are secure.

7. How much does it cost to repair OBDII code B2722 (Cadillac PASS-Key Detection Circuit) at a dealership?

The cost of repairs can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more at a dealership.

8. Can a locksmith help with OBDII code B2722 (Cadillac PASS-Key Detection Circuit) issues?

Yes, a locksmith specializing in automotive security systems may be able to assist with diagnosing and repairing issues related to the PASS-Key system.

9. Will resetting the OBDII code B2722 (Cadillac 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 reappear.

10. How long does it take to repair OBDII code B2722 (Cadillac PASS-Key Detection Circuit)?

The repair time can vary depending on the specific cause of the code and the complexity of the repair, but it may take anywhere from 1 to 4 hours to fix the issue.