C1155 Mercury 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 Mercury 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.
Code C1155 Mercury Description
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.
What are the Possible Causes of the DTC C1155 Mercury?
- 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 Mercury?
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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1155 Mercury 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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Frequently Asked Questions about C1155 Mercury Code
1. What does the OBDII code C1155 mean for a Mercury vehicle?
C1155 indicates a fault in the left front wheel speed sensor input circuit, which can affect the vehicle's ABS and traction control systems.
2. What are the common symptoms of code C1155 in a Mercury?
Symptoms include an illuminated ABS or traction control warning light, erratic speedometer readings, or reduced braking performance.
3. What causes the C1155 code to appear in a Mercury?
The code is commonly caused by a damaged or faulty left front wheel speed sensor, corroded wiring, loose connections, or a malfunctioning ABS module.
4. Can I still drive my Mercury with the C1155 code?
While you can drive the vehicle, the ABS and traction control systems may not function properly, increasing the risk of skidding or losing control in slippery conditions.
5. How do I diagnose the C1155 code on a Mercury?
Start by inspecting the left front wheel speed sensor, its wiring, and connectors for damage or corrosion. Use a multimeter to check the sensor's resistance and continuity.
6. How do I fix the C1155 code in a Mercury?
Repairs may include replacing the left front wheel speed sensor, cleaning or repairing corroded wiring, or addressing issues within the ABS module.
7. How much does it cost to fix a C1155 code on a Mercury?
The cost depends on the specific issue but typically ranges from $150 to $400, including parts and labor for replacing the wheel speed sensor.
8. Will clearing the C1155 code solve the problem?
Clearing the code without addressing the root cause will not fix the issue, and the code is likely to reappear.
9. Can a dirty wheel hub cause the C1155 code?
Yes, debris or buildup around the wheel hub can interfere with the wheel speed sensor's readings and trigger the code.
10. Is it necessary to recalibrate the ABS after fixing the C1155 code?
In most cases, recalibration is not required, but it's best to consult the vehicle's manual or a professional to ensure proper ABS functionality.
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