B1664 DTC Code: Understanding the Meaning and Troubleshooting


In the realm of automotive diagnostics, understanding and deciphering Diagnostic Trouble Codes (DTCs) is of utmost importance. These codes provide valuable insights into the health of your vehicle’s various systems, enabling effective troubleshooting and repairs. In this article, we will delve into the intricacies of the B1664 DTC code. We will explore its meaning, potential causes, and possible troubleshooting steps to rectify the underlying issue. So, let’s dive in!

Understanding the B1664 DTC Code

The B1664 DTC code is a specific code that appears on the diagnostic scanner or the onboard diagnostic system of a vehicle. It is related to a fault in the body control module (BCM) of the vehicle. The BCM is a crucial component responsible for controlling and monitoring various body-related functions such as lighting systems, power windows, central locking, and more.

When the BCM detects an issue or malfunction within its circuitry or associated components, it logs the B1664 code. This code serves as a flag for technicians, indicating that there is a problem that requires attention and further troubleshooting.

Possible Causes of the B1664 DTC Code

  • Faulty BCM: The most common cause of the B1664 DTC code is a malfunctioning or faulty body control module. This may occur due to internal circuitry issues or component failure within the BCM itself. In such cases, a replacement or repair of the BCM may be necessary.

  • Wiring or Connector Problems: Another potential cause of the B1664 DTC code is faulty wiring or connector-related issues. Damaged, corroded, or disconnected wires and connectors can disrupt the proper functioning of the BCM, triggering the code. Thorough inspection and rectification of any such issues may be required.

  • Power Supply Issues: A poor or inconsistent power supply to the BCM can also lead to the B1664 DTC code. This may be due to problems with the battery, alternator, or associated wiring. Ensuring proper voltage supply to the BCM is crucial to prevent code recurrence.

Troubleshooting the B1664 DTC Code

To address the B1664 DTC code, it is important to follow a systematic troubleshooting approach. Here are some steps and considerations to help resolve the issue:

  1. Diagnostic Scan: Begin by performing a comprehensive diagnostic scan using a suitable OBD-II scanner. This scan will help confirm the presence of the B1664 code and provide additional information about any associated codes. Make note of any other codes present to aid the diagnostic process.

  2. Visual Inspection: Perform a visual inspection of the wiring harnesses and connectors related to the BCM. Look for any signs of damage, corrosion, or loose connections. Repair or replace any faulty components as necessary.

  3. Battery and Power Supply: Inspect the vehicle’s battery and charging system to ensure proper voltage supply. Check for loose terminals, damaged cables, or faulty alternator. Repair or replace any problematic components.

  4. BCM Testing: If no obvious issues are found during the visual inspection, further testing of the BCM may be required. Consult the vehicle’s service manual or seek professional assistance to perform relevant tests such as continuity checks, resistance checks, and functional tests on the BCM.

  5. Replacement or Repair: Depending on the results of the diagnostic tests, it may be necessary to replace or repair the BCM. This should ideally be performed by a qualified technician with proper knowledge and tools to avoid potential complications.

Frequently Asked Questions (FAQs)

Q1: Can the B1664 DTC code cause any negative impact on vehicle performance?

A1: In most cases, the B1664 code does not directly affect the performance of the vehicle. However, it is essential to address the underlying issue as it may impair the proper functioning of various body-related systems, such as lighting, windows, or central locking.

Q2: Can I drive my vehicle with the B1664 DTC code?

A2: It is generally safe to drive the vehicle with the B1664 code; however, certain features influenced by the BCM may not operate correctly. It is recommended to rectify the issue at the earliest convenience to ensure optimal functionality of these systems.

Q3: How much does it typically cost to replace a faulty BCM?

A3: The cost of replacing a faulty BCM can vary depending on various factors such as the make and model of the vehicle, the location of the repair facility, and whether a new or used BCM is sourced. On average, the cost can range from $200 to $600, inclusive of parts and labor.


Understanding and addressing the B1664 DTC code is crucial for maintaining the optimal performance and functionality of your vehicle. By recognizing its meaning, potential causes, and following the appropriate troubleshooting steps, you can rectify the issue and ensure the seamless operation of body-related systems. Remember to consult your vehicle’s service manual or seek professional assistance for accurate diagnosis and repairs. Stay proactive and keep your vehicle in top shape!

About author


Meet Sam Mitchell, your experienced and reliable guide in the complex world of car fault codes. With a robust career spanning over 15 years as a professional car mechanic, John has the skills, knowledge, and practical experience to help you navigate car fault issues with confidence.


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