AutoCodes – Generic – C1155

C1155 Code - Left Front Wheel Speed Sensor Input Circuit Failure

Quick Answer

The ABS module receives wheel speed readings from each wheel speed sensor and processes this information to determine if an ABS event is necessary. Common causes include Faulty Left Front Wheel Speed Sensor, Left Front Wheel Speed Sensor harness is open or shorted, Left Front Wheel Speed Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C1155 indicates Left Front Wheel Speed Sensor Input Circuit Failure.
Common causes: Common causes include Faulty Left Front Wheel Speed Sensor, Left Front Wheel Speed Sensor harness is open or shorted, Left Front Wheel Speed Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 40,395

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 30, 2020

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code C1155 Description

The ABS module receives wheel speed readings from each wheel speed sensor and processes this information to determine if an ABS event is necessary. The wheel speed sensor detects the magnetic field of the sensor ring as it passes the face of the active wheel speed sensor.
The active wheel speed sensor generates a signal that is sent to the ABS module. The wheel speed sensor circuitry connects to the ABS module through 2 wires and a connector at each wheel speed sensor. When the ignition is turned to the RUN position, the ABS module carries out a self-test by sending a reference voltage to all of the wheel speed sensors through their circuitry to determine if they are functional.
The ABS module continuously monitors and compares the rotational speed of each wheel and when it detects an impending wheel lock, modulates brake pressure to the appropriate brake caliper. This is accomplished by triggering the hydraulic control unit (HCU) to open and close the appropriate solenoid valves. Once the affected wheel returns to normal speed, the ABS module returns the solenoid valves to their normal position and normal (base) braking resumes.

OBDII Code C1155 - Left Front Wheel Speed Sensor Input Circuit Failure - AutoCodes.com — C1155 Code - Left Front Wheel Speed Sensor Input Circuit Failure

What does this mean?

What are the Possible Causes of the DTC C1155?

Faulty Left Front Wheel Speed Sensor
Left Front Wheel Speed Sensor harness is open or shorted
Left Front Wheel Speed Sensor circuit poor electrical connection

How to Fix the DTC C1155?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1155 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

C1155 Ford — Left Front Wheel Speed Sensor Input Circuit Failure
C1155 Infiniti — Brake Fluid Level Low
C1155 Lincoln — Left Front Wheel Speed Sensor Input Circuit Failure
C1155 Mercury — Left Front Wheel Speed Sensor Input Circuit Failure
C1155 Nissan — Brake Fluid Level Low

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1155 Code

1. What are common symptoms of OBDII code C1155 (Left Front Wheel Speed Sensor Input Circuit Failure)?

The common symptoms include the ABS light illuminated on the dashboard, traction control system malfunctions, and possible loss of anti-lock brake system functionality.

2. What are the possible causes of OBDII code C1155?

Possible causes of code C1155 include a faulty left front wheel speed sensor, damaged wiring or connectors in the sensor circuit, or a problem with the ABS module.

3. How can I diagnose the cause of OBDII code C1155?

Diagnosing code C1155 typically involves inspecting the left front wheel speed sensor and its wiring for damage, testing the sensor's resistance, and using a scan tool to check for any stored trouble codes in the ABS system.

4. Can I continue driving with OBDII code C1155?

It is not recommended to continue driving with code C1155 present, as it may affect the proper functioning of the ABS system, potentially compromising vehicle safety.

5. Is it possible to repair OBDII code C1155 at home?

Depending on your automotive repair skills, you may be able to repair code C1155 at home by replacing the left front wheel speed sensor, fixing any damaged wiring, or addressing issues with the ABS module.

6. How much does it cost to fix OBDII code C1155?

The cost of fixing code C1155 can vary depending on the root cause of the issue, the make and model of the vehicle, and whether you choose to do the repairs yourself or take it to a professional mechanic. Costs may range from a few hundred to over a thousand dollars.

7. Can a bad wheel bearing cause OBDII code C1155 to appear?

Yes, a bad wheel bearing can cause erratic wheel speed sensor readings, leading to OBDII code C1155 being triggered. It is important to inspect both the wheel bearing and the wheel speed sensor when diagnosing this issue.

8. Will resetting the OBDII code C1155 make it go away permanently?

Simply resetting the code may temporarily clear the warning light, but if the underlying issue causing code C1155 is not addressed, the code is likely to reappear once the problem is detected again by the vehicle's diagnostic system.

9. How urgent is it to fix OBDII code C1155?

It is recommended to address code C1155 promptly to ensure the proper functioning of the ABS system and maintain vehicle safety. Ignoring the issue may lead to further damage or safety risks.

10. Can extreme weather conditions affect the occurrence of OBDII code C1155?

Extreme weather conditions, such as heavy rain or snow, can potentially exacerbate issues with the wheel speed sensor or its circuit, leading to the triggering of code C1155. Regular maintenance and checks can help prevent such issues.