C1155 DTC Code


In the world of automotive diagnostics, the C1155 DTC code stands out as one of the most commonly encountered trouble codes. This article aims to shed light on this specific DTC code, exploring its meaning, causes, symptoms, and possible solutions. Whether you’re a professional mechanic or an avid DIYer, understanding the ins and outs of the C1155 DTC code can prove invaluable in the pursuit of troubleshooting and repairing your vehicle. So, let’s dive deep into the world of the C1155 DTC code!

Understanding the C1155 DTC Code

The C1155 DTC code refers to a fault that affects the ABS (Anti-Lock Braking System) wheel speed sensor on one of the wheels in a vehicle. More specifically, it indicates that a problem exists with the front left ABS sensor. This code is often encountered in vehicles equipped with ABS systems, particularly in the later model years.

Possible Causes of C1155 DTC Code

Several factors can contribute to the triggering of the C1155 DTC code. Here are some of the most common causes:

  1. Faulty ABS Sensor: The primary cause of the C1155 DTC code is a malfunctioning front left ABS wheel speed sensor. Over time, these sensors can become worn, damaged, or covered in debris, leading to inaccurate readings and triggering the code.

  2. Wiring Issues: Damaged or corroded wiring leading to the ABS sensor can disrupt the signal transmission, causing the C1155 DTC code to appear. It is crucial to inspect the wiring harness for any visible damage, such as fraying or exposed wires.

  3. ABS Sensor Mounting: Improper sensor installation or a loose sensor mounting can result in inconsistent readings and, ultimately, the trigger of the C1155 DTC code. Ensure that the sensor is securely mounted in its designated position.

Symptoms of C1155 DTC Code

When the C1155 DTC code is triggered, drivers may experience several symptoms, indicating the presence of a potential problem within the ABS system. These symptoms include:

  1. Illuminated ABS Light: The activation of the ABS warning light on the vehicle’s dashboard is one of the most visible indications of a C1155 DTC code. The ABS light serves as a clear signal for the driver to seek inspection and repair.

  2. ABS System Inoperable: Alongside the illuminated ABS light, the ABS system may become inoperable. This means that the vehicle will lose the benefits provided by the ABS system, such as enhanced braking control and stability.

  3. Unusual Braking Behaviors: In certain cases, drivers may encounter abnormal braking behaviors, such as increased stopping distances, a vibrating brake pedal, or even a pulsating feeling when applying the brakes. These symptoms can arise due to the faulty readings provided by the malfunctioning ABS sensor.

Troubleshooting the C1155 DTC Code

To diagnose and potentially resolve the C1155 DTC code, follow these steps:

  1. Visual Inspection: Begin by performing a thorough visual inspection of the front left ABS sensor. Check for any signs of physical damage, debris accumulation, or loose mounting. If any issues are detected, address them accordingly.

  2. Wiring Inspection: Proceed to examine the wiring connecting the ABS sensor to the vehicle’s electrical system. Look out for any signs of damage, corrosion, or loose connections. Repair or replace any damaged components as necessary.

  3. Sensor Testing: Utilizing a suitable diagnostic tool, measure the resistance and voltage output of the ABS sensor. Compare the readings to the manufacturer’s specifications to determine if the sensor is functioning within the correct parameters. Replace the sensor if it fails the tests.

Frequently Asked Questions

  1. Q: Can I safely drive my vehicle with a C1155 DTC code?

    • A: Driving a vehicle with a C1155 DTC code is not recommended. The code indicates a faulty ABS sensor, which compromises the functionality of the ABS system. It is crucial to seek inspection and repair promptly to ensure optimal braking performance.
  2. Q: Can I manually reset the C1155 DTC code without professional equipment?

    • A: While some DTC codes can be cleared by disconnecting the vehicle’s battery, the C1155 code is often persistent. It is advisable to use a diagnostic tool with code-clearing capabilities to reset the code properly.
  3. Q: How much does it typically cost to repair a C1155 DTC code?

    • A: The cost of repairing a C1155 DTC code can vary depending on several factors, including the make and model of the vehicle, labor costs in your area, and the extent of the repair needed. It is best to consult with a trusted mechanic to get an accurate estimate for your specific situation.

In conclusion, the C1155 DTC code indicates a problem with the front left ABS wheel speed sensor. By understanding its causes, symptoms, and troubleshooting steps, you can effectively diagnose and address the underlying issue. Remember to prioritize your safety and seek professional help if needed to ensure your vehicle’s ABS system remains in optimal working condition.

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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