B1590 DTC Code: Understanding and Resolving the Issue


In the automotive world, DTC codes play a vital role in diagnosing and addressing potential issues with vehicles. One of these codes is the B1590 DTC code – an obscure yet significant code that requires attention. In this article, we dive deep into the world of B1590 DTC codes, shedding light on its meaning, potential causes, and suitable solutions. So, let’s get started!

What is the B1590 DTC Code?

The B1590 DTC code is an acronym for Body DTC (Diagnostic Trouble Code) 1590. It specifically relates to a fault in the body control module (BCM) or body control module A (BCMA). The BCMA is an essential component responsible for managing various electrical systems and functions within the vehicle’s body, such as central locking, windows, lighting, and more.

When the BCM or BCMA detects an issue or malfunction in one of these systems, it triggers the B1590 DTC code. This code serves as a warning sign that something is amiss and requires attention to prevent further complications or damage.

Common Causes of the B1590 DTC Code

To properly address the B1590 DTC code, it is crucial to understand its underlying causes. Here are some common triggers that may lead to this code:

  1. Electrical Wiring Issues:

    Faulty or damaged electrical wiring within the body control module system can disrupt the flow of data and trigger the B1590 DTC code. Damaged wiring can result from accidents, wear and tear, or rodent infestation.

    Electrical Wiring Issues

  2. Malfunctioning Body Control Module:

    A malfunctioning body control module can also trigger the B1590 DTC code. This could be due to internal component failures, water ingress, or software glitches. A comprehensive diagnostic scan should be performed to identify if the BCM is the root cause.

  3. Sensor and Switch Failures:

    Defective sensors or switches in various body systems, such as the central locking or lighting systems, can lead to the B1590 DTC code. These failures might occur due to aging, environmental factors, or poor quality components.

Resolving the B1590 DTC Code

Now that we have a good understanding of the possible causes, let’s explore the steps to resolve the B1590 DTC code. Keep in mind that addressing this code may require the expertise of a professional mechanic or dealership. However, here are some general guidelines to guide you:

  1. Thorough Inspection of Electrical Wiring:

    Start by inspecting the electrical wiring associated with the body control module. Look for any signs of damage, such as exposed wires, cuts, or loose connections. If any issues are detected, repair or replace the affected wiring accordingly.

  2. Diagnostic Scan:

    Perform a comprehensive diagnostic scan on the body control module system. This will help identify any specific faults or malfunctions within the module. If the BCM is indeed the culprit, consider consulting a professional technician for further guidance.

  3. Sensor and Switch Testing:

    Test the sensors and switches involved in the affected body system. This can be done using specialized diagnostic tools. Replace any faulty components to rectify the B1590 DTC code and ensure the smooth operation of the corresponding system.

Frequently Asked Questions (FAQs)

Q1: Can I resolve the B1590 DTC code on my own?

Answer: While basic troubleshooting steps like checking wiring connections can be done by experienced DIY enthusiasts, resolving the B1590 DTC code often requires professional expertise. Consulting a qualified mechanic or technician is recommended to ensure a proper diagnosis and resolution.

Q2: How much does it cost to fix the B1590 DTC code?

Answer: The cost to fix the B1590 DTC code can vary depending on the specific cause and required repairs. Factors such as the need for replacement parts, professional labor costs, and dealership pricing policies can influence the overall cost. It is advisable to obtain quotes from trusted mechanics or dealerships to get a clearer estimate.

Q3: Can ignoring the B1590 DTC code cause other issues?

Answer: Ignoring the B1590 DTC code can lead to potential risks and complications. Since the code signifies underlying problems within essential vehicle systems, such as central locking or lighting, leaving it unresolved can result in further malfunctions and potentially compromise safety.


The B1590 DTC code is an important identifier of faults within the body control module system of a vehicle. Understanding its causes and implementing suitable solutions is essential to ensure the smooth operation of critical vehicle systems. Remember to prioritize professional consultation and diagnostics to resolve this code accurately and mitigate any related risks.

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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