B1333 DTC Code: Everything You Need to Know


In the world of automotive diagnostics, fault codes play a crucial role in identifying and resolving issues within a vehicle. One such code is the B1333 Diagnostic Trouble Code (DTC), which is used to pinpoint specific problems related to a vehicle’s electrical system. In this comprehensive article, we will delve deep into the B1333 DTC code, its meaning, causes, symptoms, and possible solutions. So, buckle up and let’s explore!

Understanding the B1333 DTC Code

The B1333 DTC code is an alphanumeric sequence that signifies a particular problem related to the vehicle’s body control module (BCM). This code is usually encountered in Ford vehicles and is often associated with issues pertaining to the door ajar switch signal.

When this code is triggered, it indicates that the BCM has detected an abnormal or inconsistent signal from the door ajar switch. This switch is responsible for informing the vehicle’s computer system whether a door is open or closed. So, when the B1333 code is displayed, it suggests that there may be malfunctioning or incorrect inputs coming from one or more door ajar switches.

Causes of B1333 DTC Code

Now that we understand the meaning of the B1333 DTC code, let’s explore some of the potential causes behind its occurrence. Identifying the root cause will help in pinpointing the exact issue and resolving it effectively. Here are some possible reasons:

  1. Malfunctioning Door Ajar Switch: The primary cause of the B1333 code is often a faulty or malfunctioning door ajar switch. This switch may get stuck or fail to send correct signals to the BCM, resulting in the triggering of the B1333 DTC code.

  2. Electrical Wiring Issues: Another common cause could be faulty electrical wiring connected to the door ajar switch. Damaged or compromised wiring may lead to inconsistent signals being transmitted, causing the B1333 code to be recorded.

  3. BCM Malfunction: In certain cases, the body control module itself may be malfunctioning. This module is responsible for receiving and interpreting signals from various sensors, including the door ajar switches. If the BCM is faulty, it may inaccurately interpret the signals, leading to the B1333 code being triggered.

Symptoms of B1333 DTC Code

When a vehicle displays the B1333 DTC code, it is often accompanied by specific symptoms. These symptoms may vary depending on the make and model of the vehicle, but here are some common indicators associated with the B1333 code:

  • Interior Lights Malfunction: One of the most noticeable symptoms is the irregular behavior of the interior lights. They may flicker, stay continuously illuminated, or fail to turn on/off as per the door’s status.

  • Door Ajar Indicator: The vehicle’s door ajar indicator may display incorrect information or remain lit even when all doors are closed, indicating a potential issue with the door ajar switches.

  • Battery Drainage: In some cases, a malfunctioning door ajar switch can cause unnecessary power drain from the vehicle’s battery if it fails to send the correct signal to the BCM, resulting in lights or other electrical components remaining on.

Resolving the B1333 DTC Code Issue

When faced with the B1333 DTC code, it is important to diagnose and resolve the issue promptly to prevent further complications. Here are some steps that can help in resolving the B1333 code problem:

  1. Inspect Door Ajar Switches: Begin by inspecting all door ajar switches for proper functionality. Check for any physical damage, debris, or obstructions that may hinder their operation. Clean or replace any faulty switches as needed.

  2. Verify Wiring Connections: Examine the wiring connections between the door ajar switches and the BCM. Ensure that the connections are secure, undamaged, and free from corrosion. Repair or replace any compromised wiring harnesses if required.

  3. Test Body Control Module: If the above steps do not resolve the issue, it may be necessary to test the body control module for malfunctions. This requires specialized diagnostic equipment, so consulting a professional technician or visiting an authorized service center is advisable.

Frequently Asked Questions (FAQs)

Q: Can I continue driving my vehicle with the B1333 DTC code?

A: It is generally safe to drive the vehicle with the B1333 DTC code. However, it is important to address the issue promptly to avoid any potential electrical problems, battery drainage, or inaccurate readings from the door ajar switches.

Q: Can I fix the B1333 DTC code issue myself?

A: While some basic inspections and cleaning can be done by an experienced DIYer, diagnosing and resolving the B1333 DTC code issue often requires advanced diagnostic equipment and technical expertise. It is recommended to seek professional assistance for accurate diagnosis and proper repair.

Q: How much does it cost to fix the B1333 DTC code problem?

A: The total cost of resolving the B1333 DTC code issue can vary depending on multiple factors, including the make and model of the vehicle, the severity of the problem, and whether the repair is performed at a dealership or an independent auto repair shop. It is advisable to obtain quotes from reputable service providers for a reliable estimate.


The B1333 DTC code can be a pesky issue within a vehicle’s electrical system, specifically related to door ajar switches. Understanding the causes, symptoms, and potential solutions discussed in this article can assist in diagnosing and resolving the problem effectively. Remember, if in doubt, it is always recommended to consult a certified technician for accurate diagnosis and expert guidance.

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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