B1644 DTC Code: A Comprehensive Guide


In the world of automobiles, the B1644 DTC code plays a significant role in diagnosing and fixing potential issues with vehicles. Whether you are a car enthusiast, a mechanic, or simply a curious individual, understanding this trouble code can prove immensely helpful. This article aims to provide an in-depth exploration of the B1644 DTC code, its significance, possible causes, and potential solutions. So, let’s dive right in!

What is a B1644 DTC Code?

The B1644 DTC code stands for “Body Control Module (BCM) Keep Alive Memory Error.” This code indicates an issue with the body control module’s keep alive memory, which is responsible for saving important data and settings when the vehicle is turned off. When this memory becomes corrupt, it can lead to various problems within the vehicle’s electrical system.

Symptoms of the B1644 DTC Code

When the B1644 DTC code is triggered, you may experience the following symptoms in your vehicle:

  1. Malfunctioning Electrical Components: One of the primary indications of a B1644 DTC code is the malfunctioning of various electrical components, such as power windows, locks, mirrors, or interior lights. These components may become unresponsive or operate inconsistently.

  2. Intermittent Electrical Failures: Another common symptom is intermittent electrical failures. You may notice that certain electrical features work fine at times, but suddenly stop functioning without any apparent reason.

  3. Check Engine Light: The appearance of the dreaded check engine light may indicate the presence of a B1644 DTC code. While this light can indicate numerous issues, its appearance, coupled with malfunctioning electrical components, can be a strong indicator of a problem with the body control module.

Possible Causes of the B1644 DTC Code

Several issues can trigger the B1644 DTC code. Understanding these causes can help in diagnosing and rectifying the problem effectively:

1. BCM Battery Failure

The body control module relies on battery power to maintain its memory when the vehicle is not running. If the battery supplying power to the BCM fails or becomes weak, it can lead to a B1644 DTC code.

2. Faulty Wiring or Loose Connection

Loose connections or faulty wiring in the vehicle’s electrical system can disrupt the communication between the BCM and other components, resulting in a B1644 DTC code.

3. Software Glitches or Corrupted Data

In some cases, software glitches or corrupted data within the body control module itself can trigger the B1644 DTC code. This can occur due to various reasons, such as faulty programming or unexpected power surges.

How to Diagnose the B1644 DTC Code

Diagnosing the B1644 DTC code requires a systematic approach. Here are the steps you can follow:

  1. Scan the Vehicle: Use a professional OBD-II scan tool to retrieve the trouble codes stored in the vehicle’s computer. Look specifically for the B1644 DTC code.

  2. Inspect the Battery: Check the battery’s voltage and ensure it is in good condition. If the battery is weak or fails during testing, it may need to be replaced.

  3. Check Wiring and Connections: Inspect the wiring and connections between the BCM and other electrical components. Look for loose, damaged, or corroded connections. Repair or replace any faulty wiring or connections.

  4. Reset the BCM: If no visible issues are detected, resetting the body control module might help. Disconnect the battery cables and touch them together for a few seconds. Reconnect the cables and test the vehicle to see if the trouble code has cleared.

Frequently Asked Questions

1. Can I drive my vehicle with the B1644 DTC code?

While it may be possible to drive your vehicle with the B1644 DTC code, it is not advisable. The code usually indicates a problem with the electrical system, which can lead to unexpected failures while driving. It is best to have the issue diagnosed and fixed before continuing to drive the vehicle.

2. How much does it cost to fix the B1644 DTC code?

The cost of fixing the B1644 DTC code can vary depending on multiple factors, such as the make and model of the vehicle, the specific cause of the trouble code, and your location. It is recommended to consult a professional mechanic or a dealership for an accurate estimate.

3. Can I fix the B1644 DTC code myself?

Fixing the B1644 DTC code yourself can be challenging, especially if you have limited experience with vehicle electronics. It involves diagnosing electrical issues, checking wiring connections, and potentially resetting or reprogramming the body control module. It is best to consult a qualified mechanic for proper diagnosis and repair.

In conclusion, the B1644 DTC code can be a troublesome issue for vehicle owners. By understanding its meaning, symptoms, causes, and diagnostic steps, you are better equipped to tackle this problem. Remember, it is always recommended to seek professional assistance if you are unsure about handling electrical issues in your vehicle.

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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