Code U0422: Solve Invalid data received from body control module

Last Updated on March 18, 2025

Modern vehicles rely heavily on electronic communication systems, making OBD2 (On-Board Diagnostics) scanners essential for identifying potential issues. One such trouble code that car owners may encounter is U0422—a communication malfunction between vehicle control modules.
Understanding what this code means, its causes, symptoms, and fixes will help you address the issue efficiently. In this guide, we’ll break down everything you need to know about U0422, ensuring that your vehicle remains in top working condition.

What Does the U0422 Trouble Code Mean?

The U0422 trouble code indicates a communication failure between the Body Control Module (BCM) and other vehicle control modules. This issue is commonly associated with Controller Area Network (CAN) bus communication errors.

The BCM is responsible for managing multiple electrical functions in a vehicle, including:
✔ Central locking system
✔ Power windows
✔ Immobilizer system
✔ Interior lighting and dashboard controls

When the BCM receives invalid data, it triggers the U0422 fault code, leading to potential operational failures in the vehicle’s electrical systems.

Symptoms of Trouble Code U0422

If your vehicle has the U0422 error code, you may experience the following issues:

🚨 Check Engine Light (CEL) illuminated
🚗 Difficulty starting the vehicle
🔒 BCM-controlled functions stop working, including power windows, central locks, and dashboard controls

Common Causes of U0422 Trouble Code

Several factors can lead to a U0422 error, including:

🔧 Faulty Body Control Module (BCM) – If the BCM itself is damaged, it may fail to communicate with other control modules.

🔧 Open or Shorted BCM Wiring Harness – A damaged harness connection can disrupt the flow of signals, causing communication errors.

🔧 Poor Electrical Connections – Loose, corroded, or faulty connectors and terminals can lead to inconsistent data transmission between modules.

How to Diagnose Trouble Code U0422

To accurately identify and resolve the U0422 trouble code, follow these steps:

1️⃣ Use an OBD2 Scanner – Perform a full vehicle scan to check for multiple error codes that may indicate a BCM communication failure.

2️⃣ Inspect Wiring & Connectors – Visually examine the wiring harness and connectors for any signs of wear, corrosion, or disconnections.

3️⃣ Test the Electrical Circuit – Use a multimeter to check for continuity, voltage, and resistance in the wiring that connects the BCM to the CAN bus.

4️⃣ Verify the Ground Circuit – Ensure that the ground connections for the BCM are secure and free from rust or corrosion.

5️⃣ Test the BCM – If no wiring issues are found, the BCM itself may be faulty and require replacement.

Common Mistakes When Diagnosing U0422

🚫 Skipping wiring and connector checks – Many technicians immediately replace the BCM without inspecting wiring faults, leading to unnecessary expenses.

🚫 Ignoring the ground circuit – A poor ground connection can mimic BCM failure symptoms, so always check the ground wiring.

🚫 Not verifying the issue with a different scanner – Sometimes, an OBD2 scanner may misread error codes, so it’s best to confirm the issue using a reliable scan tool.

How to Fix Trouble Code U0422

To resolve the U0422 error, follow these steps:

✔ Step 1: Inspect & Repair Wiring and Connectors

• Locate and inspect the BCM wiring harness for damaged, frayed, or loose connections.
• Repair or replace any faulty wiring that is affecting communication.

✔ Step 2: Check Ground Connections

• Ensure that the BCM’s ground wire is properly secured to prevent electrical issues.

✔ Step 3: Test for Communication Errors

• Use a diagnostic tool to check if the BCM can successfully communicate with other control modules.

✔ Step 4: Replace the BCM (if necessary)

• If all wiring and ground connections are intact, but the problem persists, the BCM may be faulty and require replacement.

✔ Step 5: Consult Technical Service Bulletins (TSBs)

• Vehicle manufacturers release Technical Service Bulletins (TSBs) that provide official diagnostic and repair guidelines. These bulletins can help you save time and money while fixing your vehicle.

Final Thoughts on the U0422 Error Code

The U0422 trouble code is a BCM-related communication error that can affect your vehicle’s electrical components. While it is not an immediate safety hazard, it can cause operational issues that should be addressed as soon as possible.

✅ Most U0422 issues can be fixed within an hour by checking wiring, ground connections, and the BCM itself.
✅ Repair costs typically range between $75 and $100, making it an affordable fix compared to major electrical system failures.

If you’re unable to fix the issue yourself, consult a professional mechanic who can use advanced diagnostics to pinpoint the problem efficiently.

FAQs About U0422 Trouble Code

1. What does trouble code U0422 mean?
The U0422 error code indicates a communication failure between the Body Control Module (BCM) and other control modules, causing malfunctions in electronic systems like windows, locks, and dashboard functions.

2. Can I drive with a U0422 error code?
Yes, you can still drive, but some electrical features may not function properly. It is best to fix the issue as soon as possible to avoid further complications.

3. How do I fix U0422 code errors?

• Check and repair damaged BCM wiring or connectors
• Inspect ground connections
• Test BCM communication with a diagnostic scanner
• Replace the BCM if necessary

4. How much does it cost to fix a U0422 code?
The repair cost ranges from $75 to $100, depending on whether wiring repairs or BCM replacement is needed.

5. What happens if I ignore the U0422 trouble code?
Ignoring this error may cause inconsistent electrical performance, such as failing power windows, lock malfunctions, or dashboard warning lights staying on.