B1642 DTC Code: Causes, Symptoms, and Solutions


In the realm of automotive diagnostics, the B1642 DTC code holds significant importance. This diagnostic trouble code, along with countless others, allows technicians and enthusiasts to identify and troubleshoot specific issues within a vehicle’s systems. In this article, we will delve deeply into the B1642 DTC code, exploring its causes, symptoms, and potential solutions. So, let’s initiate our journey of understanding this intriguing code!

Understanding the B1642 DTC Code

The B1642 DTC code relates to a specific problem within a vehicle’s electrical system. This code is predominantly present in modern vehicles equipped with onboard diagnostic systems, as it helps detect malfunctions that affect various components such as sensors, circuits, and actuators. It specifically points to an issue with the Memory Set Switch Circuit.

Causes of the B1642 DTC Code

To better comprehend the B1642 DTC code, let’s explore some of the common causes that trigger this diagnostic trouble code.

1. Faulty Memory Set Switch

One of the primary causes behind the B1642 DTC code is a malfunctioning or defective memory set switch. This switch, typically found near the driver’s seat, allows the driver to save their desired seat adjustments. If the memory set switch is damaged or not functioning properly, it can trigger the B1642 DTC code.

2. Short Circuit

Short circuits within the Memory Set Switch Circuit can also lead to the B1642 DTC code. When an unintended connection occurs between wires, it can disrupt the normal flow of electrical current. Short circuits can be caused by damaged wiring, loose connections, or faulty components.

3. Open Circuit

An open circuit, wherein the electrical current is interrupted due to a break in the circuit, is another potential cause of the B1642 DTC code. Open circuits can arise from damaged wiring, disconnected connectors, or faulty components within the Memory Set Switch Circuit.

Symptoms of the B1642 DTC Code

The B1642 DTC code manifests itself through several discernible symptoms. Recognizing these symptoms can aid in prompt diagnosis and resolution of the underlying issue.

1. Malfunctioning Memory Set Switch

When the B1642 DTC code is present, one of the noticeable symptoms is a malfunctioning memory set switch. The switch may fail to function altogether, preventing the driver from saving their desired seat adjustments.

2. Inoperative Seat Adjustments

Another symptom associated with the B1642 DTC code is the inability to adjust the seats. The affected seats may become unresponsive to the driver’s attempts to modify their position, hindering comfort and convenience.

3. Illuminated Malfunction Indicator Lamp (MIL)

In certain instances, the B1642 DTC code triggers the illumination of the Malfunction Indicator Lamp (MIL) on the vehicle’s dashboard. The MIL serves as a visual indicator of potential issues and prompts the driver to seek professional assistance.

Solutions for the B1642 DTC Code

Once the B1642 DTC code has been identified, it is essential to address the underlying problem promptly. Here are a few potential solutions to consider.

1. Diagnosis and Repair

Begin by conducting a thorough diagnosis using specialized diagnostic tools to pinpoint the exact cause of the B1642 DTC code. Once identified, repair or replace the faulty memory set switch, wiring, or components to rectify the issue. It is highly recommended to consult a certified technician for accurate diagnosis and efficient repair.

2. Inspection and Cleaning

In some cases, the B1642 DTC code may be triggered by dirt, dust, or debris interfering with the memory set switch or its connectors. Conduct a careful inspection of the switch and associated components, and if necessary, clean them using appropriate electrical contact cleaners to restore proper functionality.

3. Circuit Testing and Continuity Checks

Another effective approach is to perform circuit testing and continuity checks within the Memory Set Switch Circuit. This involves inspecting the wiring for any breaks, ensuring proper connections, and verifying electrical continuity. Repair or replace any damaged wiring or components accordingly to address the B1642 DTC code.

Frequently Asked Questions (FAQs)

To further enrich your understanding, here are some frequently asked questions related to the B1642 DTC code, along with their answers.

Q1: Is it possible to drive the vehicle with the B1642 DTC code?

A1: It is generally safe to drive the vehicle with the B1642 DTC code. However, it is recommended to have the issue addressed by a professional at the earliest convenience to prevent further complications.

Q2: Can the B1642 DTC code be reset without repairs?

A2: Resetting the B1642 DTC code without addressing the underlying cause is essentially clearing the symptom without resolving the problem. It is strongly advised to identify and rectify the root cause to prevent the code from reappearing.

Q3: Can I fix the B1642 DTC code myself?

A3: While some DIY enthusiasts may have the necessary skills to tackle certain repairs, resolving the B1642 DTC code is best left to qualified technicians. They possess the expertise, specialized tools, and diagnostic equipment required for effective diagnosis and repair.


Navigating the world of automotive diagnostics can be daunting, especially when faced with a specific DTC code like B1642. In this comprehensive article, we explored the causes, symptoms, and solutions associated with the B1642 DTC code. By understanding these aspects, you are now equipped to take the appropriate steps to resolve this code and restore optimal performance to your vehicle. Remember, if you encounter the B1642 DTC code, consult a professional to ensure accurate diagnosis and efficient repair.

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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