B1357 DTC Code: Causes, Symptoms, and Solutions


In the world of automotive diagnostics, DTC (Diagnostic Trouble Code) plays a significant role in identifying and resolving various issues within a vehicle. One such trouble code is the B1357 DTC code. In this article, we will dive deep into the causes, symptoms, and possible solutions related to the B1357 DTC code. So, if you own a vehicle and are experiencing this specific trouble code, keep reading to understand its implications and how to tackle it effectively.

Understanding the B1357 DTC Code

The B1357 DTC code refers to an ignition key-in circuit failure. The code is usually set when the Body Control Module (BCM) detects an open or short circuit in the ignition key-in switch circuit. This circuit is responsible for communicating the status of the ignition key to various vehicle systems, such as the interior lights, door locks, and anti-theft system.

Causes of B1357 DTC Code

There are several potential causes behind the occurrence of the B1357 DTC code. These include:

  1. Faulty Ignition Key: A damaged or malfunctioning ignition key can trigger the B1357 DTC code. This can be due to wear and tear, improper handling, or exposure to water or extreme temperatures.

  2. Faulty Ignition Key-in Switch: If the ignition key-in switch fails to properly communicate with the BCM, it can result in the B1357 DTC code. This can be caused by loose connections, corrosion, or a faulty switch mechanism.

  3. Short Circuit: A short circuit in the ignition key-in switch circuit can also lead to the B1357 DTC code. This can occur due to damaged wiring, a defective component, or faulty electrical connections.

Symptoms of B1357 DTC Code

When the B1357 DTC code is triggered, you may experience one or more of the following symptoms:

  • Inoperative Interior Lights: The interior lights of your vehicle may fail to function properly. They may not turn on when you open the door or manually activate the switch.

  • Inability to Lock/Unlock Doors: You may find it difficult to lock or unlock the doors using the key fob or the interior switches. This can be a result of the faulty key-in switch circuit affected by the B1357 DTC code.

  • Anti-Theft System Malfunction: The B1357 DTC code can also impact the anti-theft system of your vehicle. This may lead to issues when trying to start your car or trigger false alarms.

Solutions for B1357 DTC Code

Here are some potential solutions to consider when dealing with the B1357 DTC code:

  1. Inspect and Replace Ignition Key: Start by examining your ignition key for any physical damage or signs of wear. If necessary, replace the key with a new one. Make sure to use the appropriate key for your vehicle to avoid compatibility issues.

  2. Check Ignition Key-in Switch Circuit: Inspect the ignition key-in switch circuit for any loose or corroded connections. Ensure that all wiring and connectors associated with the circuit are in good condition. Repair or replace any damaged components as needed.

  3. Consult a Professional Technician: If you are unable to resolve the B1357 DTC code on your own, it’s recommended to take your vehicle to a qualified technician. They have the necessary tools and expertise to diagnose and repair the issue effectively.

Frequently Asked Questions

1. Can I still drive my car with the B1357 DTC code?

Yes, you can technically drive your car with the B1357 DTC code. However, it is advisable to address the issue as soon as possible to prevent any further complications or potential failures in the affected systems.

2. Can I reset the B1357 DTC code myself?

While you may be able to clear the trouble code using an OBD-II scanner, it’s important to identify and resolve the underlying issue causing the code. Simply resetting the code without addressing the root cause may lead to the code reappearing in the future.

3. How much does it cost to fix the B1357 DTC code?

The cost of repairing the B1357 DTC code can vary depending on the specific cause and the complexity of the repair. It is recommended to consult a professional technician or your vehicle’s manufacturer for an accurate estimate of the repair cost.


The B1357 DTC code is an ignition key-in circuit failure that can affect various systems in your vehicle. By understanding the causes, symptoms, and possible solutions discussed in this article, you can take appropriate steps to diagnose and address the issue effectively. Remember, if you are uncertain or unable to resolve the problem on your own, it is always wise to seek professional assistance to ensure proper diagnosis and repair of the B1357 DTC code.

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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