B1355 DTC Code: A Comprehensive Guide


In the realm of automotive diagnostics, trouble codes play a vital role in identifying and resolving issues that may arise within a vehicle’s systems. One such code is the B1355 DTC code, which can give valuable insights into specific problems related to a vehicle’s electrical circuitry. This article aims to provide a deep and detailed analysis of the B1355 DTC code, including its definition, potential causes, symptoms, and possible solutions.

Understanding the B1355 DTC Code

The B1355 DTC code is specific to General Motors (GM) vehicles and is related to a fault within the Ignition Run/Crank Input Circuit. This code typically occurs when there is a discrepancy between the ignition switch’s run (start) position and the crank input signal received by the Body Control Module (BCM). The BCM is responsible for numerous functions within the vehicle, including monitoring and controlling various electrical components.

Potential Causes of the B1355 DTC Code

1. Faulty Ignition Switch

One potential cause of the B1355 DTC code is a malfunctioning or worn-out ignition switch. Over time, the ignition switch may experience wear and tear, leading to inconsistent signals being transmitted to the BCM. If the BCM senses a discrepancy between the expected run position and the actual crank input, it may trigger the B1355 DTC code.

2. Wiring Issues

Another possible cause of the B1355 DTC code can be attributed to wiring problems. Loose, damaged, or shorted wires within the ignition switch circuit can disrupt the proper transmission of signals, resulting in the code being triggered. It is essential to thoroughly inspect the wiring harness and connectors associated with the ignition system to identify any potential issues.

3. Faulty Body Control Module (BCM)

In some cases, a malfunctioning Body Control Module (BCM) may be responsible for the B1355 DTC code. The BCM is responsible for receiving and analyzing various input signals from sensors and switches throughout the vehicle. If the BCM fails to interpret the correct signals from the ignition switch circuit, it may trigger the B1355 code as a safety measure.

Symptoms of the B1355 DTC Code

When the B1355 DTC code is triggered, several symptoms may manifest, indicating potential underlying issues within the vehicle. Some of the common symptoms associated with this code include:

  • Intermittent or complete failure to start the engine
  • Engine stalling while driving or at idle
  • Malfunctioning or erratic gauges on the instrument cluster
  • Inability to disengage the vehicle’s anti-theft system
  • Illuminated Check Engine Light

It is essential to note that while these symptoms are often present with the B1355 DTC code, they can also be associated with other issues. Therefore, a comprehensive diagnosis is crucial to pinpoint the root cause accurately.

Resolving the B1355 DTC Code

Addressing the B1355 DTC code requires a systematic approach to troubleshooting and diagnosis. Here are some potential solutions to consider:

  1. Check the Ignition Switch: Start by inspecting the ignition switch for any signs of wear or damage. If necessary, replace the ignition switch with a new one from a reputable manufacturer. Ensure proper installation and verify that the switch is functioning correctly.

  2. Inspect Wiring and Connectors: Carefully examine the wiring harness and connectors associated with the ignition system. Look for loose or damaged wires, corrosion, or signs of short circuits. Repair or replace any faulty components as needed.

  3. Test the Body Control Module (BCM): If the previous steps do not resolve the issue, it may be necessary to test the BCM’s functionality. Consult the vehicle’s service manual or seek professional assistance to perform comprehensive diagnostics and, if required, replace the BCM.

Remember, it is crucial to follow the recommended diagnostic procedures outlined by the vehicle manufacturer to accurately identify and resolve the B1355 DTC code. Professional assistance or guidance from a certified automotive technician may be required, especially for complex diagnostic procedures.

Frequently Asked Questions

Q1: Can the B1355 DTC code be cleared/reset without fixing the underlying issue?

A1: Clearing or resetting the B1355 DTC code without addressing the underlying problem is not recommended. Resetting the code may temporarily eliminate the Check Engine Light, but the issue causing the code will persist. It is essential to diagnose and resolve the root cause to ensure the vehicle’s optimal performance and safety.

Q2: Can a DIY enthusiast diagnose and fix the B1355 DTC code?

A2: While some individuals with automotive knowledge may successfully diagnose and resolve simpler issues, the B1355 DTC code involves complex electrical systems. Due to the potential dangers and complexities involved, it is advisable to seek professional assistance or guidance from a certified automotive technician for accurate diagnosis and reliable repairs.

Q3: Are there any preventive measures to avoid the B1355 DTC code?

A3: While certain factors leading to the B1355 code may be beyond driver control, regular maintenance and servicing can help minimize the risk. Following the recommended maintenance schedule, ensuring proper wiring connections, and promptly addressing any warning signs or symptoms can contribute to early detection and prevention of potential issues related to the B1355 DTC code.


In summary, the B1355 DTC code signifies a problem within the Ignition Run/Crank Input Circuit of GM vehicles. Understanding the potential causes, symptoms, and appropriate resolutions is crucial for accurate diagnosis and efficient repairs. Remember to follow recommended diagnostic procedures and, if necessary, consult a certified automotive technician for comprehensive assistance. By addressing the B1355 DTC code promptly and accurately, you can ensure the optimal performance and safety of your vehicle.

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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