C1158 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 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 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?
- 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?
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 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
- C1158 Ford — Left Front Wheel Speed Sensor Input Signal Erratic
- C1158 Lincoln — Left Front Wheel Speed Sensor Input Signal Erratic
- C1158 Mazda — Left Front ABS Wheel Speed Sensor/Sensor Rotor
- C1158 Mercury — Left Front Wheel Speed Sensor Input Signal Erratic
Frequently Asked Questions about C1158 Code
1. What does OBDII code C1158 mean?
Code C1158 indicates an issue with the left front wheel speed sensor, specifically that its input signal is erratic or inconsistent.
2. What are the common symptoms of code C1158?
Symptoms may include an illuminated ABS or traction control warning light, erratic ABS or traction control operation, and potential loss of ABS functionality.
3. What causes the C1158 code to appear?
Common causes include a faulty left front wheel speed sensor, damaged or corroded wiring, a loose or dirty sensor connector, or a damaged tone ring.
4. Can a dirty wheel speed sensor trigger code C1158?
Yes, dirt or debris on the left front wheel speed sensor or tone ring can interfere with signal transmission and trigger the code.
5. How do you diagnose code C1158?
Diagnosis involves checking the left front wheel speed sensor, inspecting the wiring and connectors for damage or corrosion, and testing the sensor’s output using a multimeter or scan tool.
6. Can driving with code C1158 cause further damage?
While it’s usually safe to drive, the vehicle’s ABS and traction control systems may not function properly, increasing the risk of skidding in slippery conditions.
7. How do you fix code C1158?
Repairs may include cleaning or replacing the left front wheel speed sensor, fixing damaged wiring, ensuring the tone ring is clean and intact, or replacing the sensor connector if corroded.
8. How much does it cost to fix code C1158?
The cost varies but typically ranges from $100 to $300, depending on whether the issue is with the sensor, wiring, or other components.
9. Can low tire pressure cause code C1158?
Low tire pressure is unlikely to cause this specific code, but it can affect wheel speed readings and should be checked as part of regular maintenance.
10. Is a scan tool necessary to clear code C1158?
Yes, after repairs are completed, a scan tool is typically required to clear the code and ensure the issue is resolved.
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