C1158 Ford Code - Left Front Wheel Speed Sensor Input Signal Erratic
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
- C1158 Ford indicates Left Front Wheel Speed Sensor Input Signal Erratic.
- 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 C1158 Ford 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 C1158 Ford?
- 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 C1158 Ford?
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 C1158 Ford 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 C1158 Ford Code
1. What does the OBDII code C1158 mean on a Ford?
The code C1158 indicates an erratic input signal from the left front wheel speed sensor, which is part of the ABS system.
2. What are the common symptoms of the C1158 code?
Symptoms include an illuminated ABS warning light, loss of ABS function, and potential traction control issues.
3. What causes the C1158 code on a Ford vehicle?
Common causes include a faulty left front wheel speed sensor, damaged wiring or connectors, a malfunctioning ABS module, or debris obstructing the sensor.
4. Can I still drive my Ford with the C1158 code active?
Yes, but your ABS and traction control systems may not function properly, increasing the risk of wheel lock-up during hard braking.
5. How do I diagnose the C1158 code?
Start by inspecting the left front wheel speed sensor, wiring, and connectors for damage or debris. Use a multimeter or scan tool to check the sensor’s signal.
6. How do I fix the C1158 code on a Ford?
Repairs may include cleaning or replacing the left front wheel speed sensor, repairing damaged wiring, or addressing issues with the ABS module.
7. How much does it cost to fix the C1158 code?
Costs vary, but replacing a wheel speed sensor typically ranges from $100 to $300, including parts and labor.
8. Can a dirty wheel hub cause the C1158 code?
Yes, debris or rust on the wheel hub can interfere with the sensor’s ability to read the tone ring, causing an erratic signal.
9. Will resetting the code fix the C1158 issue?
Resetting the code without addressing the root cause will only temporarily clear the warning; the issue will likely return.
10. Can a failing ABS module trigger the C1158 code?
Yes, a malfunctioning ABS module can disrupt communication with the wheel speed sensor and cause this code to appear.
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