B1335 DTC Code


The B1335 Diagnostic Trouble Code (DTC) is an alphanumeric code that is associated with a specific fault or problem in the vehicle’s electronic control module (ECM) system. It is commonly found in Ford vehicles, although it may be present in other makes and models as well. The B1335 code relates specifically to a fault in the door ajar lamp circuit, indicating that there is an issue with the sensor or the wiring connected to the door ajar system. This article will provide you with a comprehensive understanding of the B1335 DTC code, its causes, symptoms, and possible solutions.

Causes of the B1335 DTC Code

The B1335 DTC code can be triggered due to various reasons. It is essential to understand and identify these causes to effectively diagnose and resolve the issue. Some common causes of the B1335 code include:

  1. Faulty Door Ajar Sensor: One of the primary reasons for the B1335 code is a malfunctioning or failed door ajar sensor. The sensor may have become damaged, clogged, or worn out over time, resulting in inaccurate readings and triggering the code.

  2. Wiring Issues: Another possible cause of the B1335 code is faulty wiring connecting the door ajar sensor and the ECM. Damaged or broken wires can disrupt the flow of electrical signals, leading to improper functioning of the door ajar lamp circuit.

  3. ECM Malfunction: In some cases, the B1335 code may be a result of a malfunction within the electronic control module itself. The ECM is responsible for processing the inputs from various sensors, and if it fails to do so accurately, it may trigger the B1335 code.

Symptoms of the B1335 DTC Code

When the B1335 code is present, there are specific symptoms you may experience in your vehicle. Recognizing these symptoms can help in the diagnosis and resolution of the issue. Some common symptoms associated with the B1335 DTC code include:

  1. Door Ajar Warning Light: The most apparent symptom is the illumination of the door ajar warning light on your vehicle’s dashboard. This light indicates that there is an issue with the door ajar lamp circuit.

  2. Dome Light Malfunction: Another possible symptom is the malfunctioning of the interior dome light. It may fail to turn on or off correctly, even when the doors are opened or closed.

  3. False Door Open Warning: The vehicle’s computer system may falsely detect that the doors are open, resulting in warning chimes or messages indicating a door open when it is not the case.

  4. Battery Drainage: In some instances, the B1335 code can cause battery drainage as the interior lights may remain on, even when the doors are closed, leading to a dead battery.

Resolving the B1335 DTC Code

Resolving the B1335 code involves a systematic approach to identify and rectify the underlying issue. Here are some possible solutions to consider:

  1. Sensor Inspection: Start by inspecting the door ajar sensor for signs of damage or debris that may be affecting its performance. Clean or replace the sensor as necessary.

  2. Wiring Inspection: Thoroughly examine the wiring connected to the door ajar circuit, looking for loose connections, frayed wires, or any signs of damage. Repair or replace any faulty wiring.

  3. Resetting the ECM: In some cases, resetting the ECM may resolve the B1335 code. Disconnect the battery for a few minutes, then reconnect it to clear any stored error codes in the ECM.

  4. Professional Assistance: If the above steps do not resolve the issue, it is advisable to seek professional help from a certified mechanic or technician. They will have the necessary tools and expertise to diagnose and repair the underlying problem effectively.

Frequently Asked Questions (FAQs)

Q1: Can I drive my vehicle with the B1335 code?

A1: It is generally safe to drive your vehicle with the B1335 code, but it is essential to get the issue resolved as soon as possible. Ignoring the problem may result in other electrical malfunctions or potential safety hazards.

Q2: Can I fix the B1335 code myself?

A2: While some basic troubleshooting steps can be performed by vehicle owners, resolving the B1335 code often requires specialized tools and knowledge. It is recommended to seek professional assistance for an accurate diagnosis and repair.

Q3: How much does it cost to fix the B1335 DTC code?

A3: The cost of fixing the B1335 code may vary depending on the underlying cause and the labor rates in your area. It is best to consult with a professional mechanic for an accurate estimate tailored to your specific vehicle and situation.

In conclusion, the B1335 DTC code is associated with a fault in the door ajar lamp circuit. By understanding the causes, symptoms, and possible solutions outlined in this article, you are better equipped to diagnose and resolve the issue effectively. Remember, seeking professional assistance is always recommended for complex electrical or vehicle-related problems.

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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