AutoCodes – Generic – B324A

B324A Code - Rear Cargo Door Unlock Motor Circuit

Quick Answer

When the Body Control Module (BCM) receives a liftgate release command, it will provide voltage to one side of the relay and ground to the other side of the relay. Common causes include Faulty Rear Cargo Door Unlock Motor, Rear Cargo Door Unlock Motor harness is open or shorted, Rear Cargo Door Unlock Motor circuit poor electrical connection. 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: B324A indicates Rear Cargo Door Unlock Motor Circuit.
Common causes: Common causes include Faulty Rear Cargo Door Unlock Motor, Rear Cargo Door Unlock Motor harness is open or shorted, Rear Cargo Door Unlock Motor circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,293

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 Mar 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B324A Description

When the Body Control Module (BCM) receives a liftgate release command, it will provide voltage to one side of the relay and ground to the other side of the relay. This will energize the relay causing the switch side of the relay to close and will then provide B+ voltage to the liftgate latch assembly.

OBDII Code B324A - Rear Cargo Door Unlock Motor Circuit - AutoCodes.com — B324A Code - Rear Cargo Door Unlock Motor Circuit

What does this mean?

What are the Possible Causes of the DTC B324A?

Faulty Rear Cargo Door Unlock Motor
Rear Cargo Door Unlock Motor harness is open or shorted
Rear Cargo Door Unlock Motor circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B324A?

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 B324A 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 B324A code?

Need more information on how to fix the B324A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B324A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B324A Buick — Rear Cargo Door Unlock Motor Circuit
B324A Cadillac — Rear Cargo Door Unlock Motor Circuit
B324A Chevrolet — Rear Cargo Door Unlock Motor Circuit
B324A GMC — Rear Cargo Door Unlock Motor Circuit

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 B324A Code

1. What does OBDII code B324A mean?

Code B324A indicates a problem with the rear cargo door unlock motor circuit, typically involving an electrical fault or malfunction in the circuit controlling the door's unlock mechanism.

2. What are the symptoms of code B324A?

Common symptoms include the rear cargo door not unlocking, intermittent functionality of the unlock mechanism, or no response when using the key fob or interior controls.

3. What causes the B324A code to appear?

This code can be caused by a faulty unlock motor, damaged wiring or connectors in the circuit, a blown fuse, or a malfunctioning body control module (BCM).

4. Can I still drive my vehicle with the B324A code?

Yes, you can drive your vehicle; however, you may lose the ability to unlock the rear cargo door electronically, which can be inconvenient.

5. How do I diagnose the B324A code?

Start by checking the rear cargo door unlock motor, inspecting the wiring and connectors for damage or corrosion, and testing the circuit for continuity. Use a scan tool to confirm the code and clear it after repairs.

6. How can I fix the B324A code?

Repairs may include replacing the rear cargo door unlock motor, repairing or replacing damaged wiring or connectors, replacing a blown fuse, or reprogramming or replacing the BCM if necessary.

7. How much does it cost to repair a B324A code issue?

Repair costs vary depending on the root cause, ranging from $50 to $150 for wiring repairs and up to $500 or more if the BCM or unlock motor must be replaced.

8. Can a blown fuse cause the B324A code?

Yes, a blown fuse in the circuit controlling the rear cargo door unlock motor can trigger this code and should be checked during diagnosis.

9. Is the rear cargo door unlock motor easy to replace?

In most vehicles, the motor is accessible by removing the rear cargo door's interior panel. While it may require some tools and patience, it is generally a moderate DIY repair.

10. Can a software issue cause the B324A code?

Yes, a malfunction in the body control module's programming could cause this code. In such cases, reprogramming or replacing the BCM may be necessary.