U019B - Understanding DTC U019B: Communication Issue with the Body Control Module in Common Vehicles

Quick Answer

U019B means: U019B signifies a communication failure between the Body Control Module and other modules in the vehicle.

Fix: Check and replace faulty components Cost: $300 - $800 Time: 90-180 minutes

Can I drive with U019B? Immediate attention is recommended to prevent further electrical issues.

Common Questions

What does U019B mean and how does it affect my car?

The U019B code means that your Body Control Module is having trouble communicating with other electronic systems in your vehicle. This can lead to issues with lights, locks, and other electronic features. Ignoring this problem could lead to more severe electrical failures and safety concerns.

What are the most common causes of U019B and how much does it cost to fix?

Common causes include a faulty Body Control Module, damaged wiring, or software issues. Repair costs can range from $50 for a software update to $800 for a BCM replacement, depending on the specific problem and vehicle make.

Can I drive my car with U019B or should I stop immediately?

It is not advisable to drive your vehicle with the U019B code active. Doing so can lead to malfunctioning electronic systems, which may compromise safety and cause further damage.

How can I diagnose U019B myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for DTCs, view freeze frame data, and monitor real-time data from the BCM and other modules. Look for any inconsistencies in communication and check the wiring and connectors for visible issues.

What vehicles are most commonly affected by U019B?

Commonly affected vehicles include the 2016-2020 Chevrolet Malibu, 2017-2021 GMC Acadia, and some models of Ford and Dodge from the same years. Check for any recalls or Technical Service Bulletins (TSBs) related to these issues.

How can I prevent U019B from happening again?

To prevent U019B from recurring, ensure regular maintenance of your vehicle's electrical systems, avoid overloading the BCM with aftermarket accessories, and keep connections clean and secure. Regular diagnostics using the GeekOBD APP can also help catch potential issues early.

What is U019B?

The U019B code indicates a communication issue between the vehicle's control modules, specifically concerning the Body Control Module (BCM). This code often appears in various vehicle models, including the 2016-2020 Chevrolet Malibu and the 2017-2021 GMC Acadia. When your vehicle’s computer system detects that the BCM is not communicating as expected with other modules, it triggers the U019B code. This can lead to various electrical problems like malfunctioning lights or issues with the power windows. The BCM is responsible for managing numerous functions, including lighting, security, and climate control settings. If this module cannot communicate properly, it may result in multiple systems failing, thereby affecting the vehicle's performance and safety. In practical terms, this can lead to disappointing experiences, such as being unable to start your vehicle or experiencing erratic behavior from electronic components. If you see this code, it’s essential to address it promptly to avoid further complications and ensure the reliability of your vehicle.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U019B is present:

  • Check engine light illuminates and remains on, indicating potential communication issues with the BCM.
  • Electrical components such as power windows or locks fail to respond intermittently, frustrating the user experience.
  • Malfunctioning dashboard indicators that may flicker or remain lit without cause, leading to confusion about vehicle status.
  • Erratic operation of climate control settings, which may lead to discomfort while driving.
  • Complete failure of the vehicle to start, which can leave the driver stranded unexpectedly.

Possible Causes

Most common causes of U019B (ordered by frequency):

  1. The most common cause of U019B is a faulty Body Control Module, which has a likelihood of about 60%. A BCM can fail due to age, exposure to moisture, or electrical surges.
  2. A second cause could be damaged wiring or connectors associated with the BCM, with a likelihood of 25%. This can happen due to wear and tear or improper installation during repairs.
  3. The third potential cause is software issues in the BCM, which can occur during updates or resets, with a likelihood of around 10%. Keeping the software updated can help prevent this.
  4. A less common but serious cause is a failing power supply to the BCM, which can disrupt its operation and is essential to diagnose quickly.
  5. A rare cause could be interference from aftermarket accessories that have been installed, which may confuse the BCM's communication pathways.

U019B Repair Costs

Cost Breakdown by Repair Type

BCM Replacement

Replacing the Body Control Module if it is found to be faulty.

  • Total: $300 - $800
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring or connectors leading to the BCM.

  • Total: $100 - $400
  • Success rate: 90%
Software Update

Updating the BCM software to fix communication issues.

  • Total: $50 - $150
  • Success rate: 75%
Money-Saving Tips for U019B
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional U019B Diagnosis Process

Follow these systematic steps to accurately diagnose U019B. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion around the BCM and its connectors (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion around the BCM and its connectors (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Use the app to retrieve all diagnostic trouble codes and freeze frame data, giving context to the U019B code (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Use the app to retrieve all diagnostic trouble codes and freeze frame data, giving context to the U019B code (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or other diagnostic tools to test the BCM and associated wiring for continuity and proper voltage (20-30 minutes)

Step 3: Component testing - Use a multimeter or other diagnostic tools to test the BCM and associated wiring for continuity and proper voltage (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - After repairs, verify the proper operation of the BCM and clear any fault codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - After repairs, verify the proper operation of the BCM and clear any fault codes using the GeekOBD APP (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to ensure all electronic systems are functioning correctly and to confirm the repair (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to ensure all electronic systems are functioning correctly and to confirm the repair (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: BCM Replacement on 2017 Chevrolet Malibu

Vehicle: 2017 Chevrolet Malibu, 45,000 miles

Problem: Customer reported multiple electrical failures including inoperable power windows and a persistent check engine light.

Diagnosis: Initial inspection showed no visible damage; OBD2 scan revealed U019B and other related codes. Testing confirmed a faulty BCM.

Solution: Replaced the Body Control Module and reprogrammed it to the vehicle.

Cost: $650 (parts and labor included)

Result: All electronic systems restored to normal functionality; customer reported satisfaction with repair.

Case Study 2: Wiring Repair on 2019 GMC Acadia

Vehicle: 2019 GMC Acadia, 30,000 miles

Problem: Vehicle had intermittent electrical issues and the check engine light was illuminated.

Diagnosis: Inspection revealed frayed wiring leading to the BCM; OBD2 scan confirmed U019B.

Solution: Repaired the damaged wiring and secured all connectors.

Cost: $250 (parts and labor included)

Result: Resolved the electrical issues, and no further problems reported post-repair.

Diagnose U019B

Use GeekOBD APP for professional diagnosis!

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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: U019B
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes