C1155 – OBD-II DTC

OBD-II DTC C1155 – Speed Wheel Sensor LF Input Circuit Failure

DTC C1155 meaning

DTC C1155 refers to a diagnostic trouble code indicating a failure in the left front speed wheel sensor input circuit. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components to ensure proper functionality. The left front speed wheel sensor is crucial for providing accurate wheel speed data to the vehicle’s anti-lock braking system (ABS) and traction control system (TCS).

DTC C1155 symptoms

Common symptoms associated with DTC C1155 may include:

• Illumination of the ABS warning light on the dashboard
• Loss of ABS functionality
• Increased stopping distances
• Unusual behavior of the traction control system
• Potential activation of the brake warning light

DTC C1155 causes

Several factors can lead to the occurrence of DTC C1155, including:

• Faulty left front speed wheel sensor
• Damaged or corroded wiring in the sensor circuit
• Poor electrical connections or loose connectors
• Issues with the ABS control module
• Mechanical problems such as a damaged wheel bearing

DTC C1155 seriousness

DTC C1155 is considered a serious issue as it affects the vehicle’s braking system. The failure of the left front speed wheel sensor can lead to:

• Reduced braking efficiency
• Increased risk of skidding or loss of control during braking
• Potential safety hazards for the driver and passengers

It is essential to address this code promptly to ensure safe vehicle operation.

How to diagnose DTC C1155

To diagnose DTC C1155, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the C1155 code.
2. Inspect the left front speed wheel sensor for visible damage or wear.
3. Check the wiring and connectors for signs of corrosion or loose connections.
4. Test the sensor’s resistance and voltage output according to manufacturer specifications.
5. Examine the ABS control module for any faults or error codes.
6. Perform a road test to observe the behavior of the ABS and traction control systems.

How to fix DTC C1155 step-by-step instructions

To fix DTC C1155, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on electrical components.
2. Inspect and repair or replace the left front speed wheel sensor if it is faulty.
3. Repair any damaged wiring or connectors in the sensor circuit.
4. Reconnect the battery and clear the DTC using an OBD-II scanner.
5. Perform a road test to verify that the ABS and traction control systems are functioning correctly.
6. If the code reappears, further diagnose the ABS control module and related components.

How to erase DTC C1155

To erase DTC C1155, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the vehicle’s ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes from the vehicle’s memory.
5. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

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