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Engine-Codes – Generic – C1120

C1120 Code - Front Left Input ABS Solenoid

Quick Answer

The C1120 diagnostic trouble code refers to an issue with the Front Left Input ABS Solenoid in the vehicle's anti-lock braking system (ABS). Common causes include Faulty ABS solenoid, Wiring or connector issues, ABS module failure. 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
C1120 indicates Front Left Input ABS Solenoid.
Common causes
Common causes include Faulty ABS solenoid, Wiring or connector issues, ABS module failure.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code C1120 Description

The C1120 diagnostic trouble code refers to an issue with the Front Left Input ABS Solenoid in the vehicle's anti-lock braking system (ABS). The ABS solenoid is responsible for regulating hydraulic pressure to the brakes to prevent wheel lock-up during sudden braking or slippery road conditions. When this solenoid malfunctions, it can lead to potential safety hazards, as the ABS system may not function properly, affecting the vehicle's ability to brake efficiently and maintain stability on the road.

OBDII Code C1120 - Front Left Input ABS Solenoid
C1120 Code - Front Left Input ABS Solenoid

Common Causes of C1120

  1. Faulty ABS solenoid
  2. Wiring or connector issues
  3. ABS module failure
  4. Low brake fluid level
  5. Contaminated brake fluid

Symptoms of C1120

  1. Illuminated ABS warning light on the dashboard
  2. Increased stopping distance when braking
  3. ABS system engages unexpectedly or fails to engage
  4. Brakes feel spongy or unresponsive
  5. Traction control system may be affected

How to Fix C1120

  1. Begin by inspecting the wiring and connectors leading to the Front Left Input ABS Solenoid for any damage or corrosion. Repair or replace as necessary.
  2. Check the brake fluid level and quality. Top up or flush and bleed the system if needed.
  3. Test the ABS solenoid for proper function using a diagnostic tool. Replace the solenoid if it fails the test.
  4. If the issue persists, the ABS module may need to be replaced. Ensure it is properly programmed and calibrated for the specific vehicle.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the ABS system is functioning correctly.

Cost to Fix C1120

The cost of repairing a Front Left Input ABS Solenoid issue can vary depending on the extent of the problem and the specific vehicle. On average, parts for ABS solenoids can range from $100 to $300, while labor costs can add another $100 to $200. Overall, the total repair cost could be between $200 and $500. It's important to note that diagnostic time and labor rates at auto repair shops can fluctuate, so it's advisable to check with local providers for a more accurate estimate.

What does this mean?

Tech Notes for C1120

The ABS has an electronic control unit to control major functions. The control unit accepts input signals from sensors and controls operation of the actuator. It is also important to check for conventional problems such as air leaks in the booster or lines, lack of brake fluid, or other problems with the brake system.
It is much more difficult to diagnose a problem that occurs intermittently rather than continuously. Most intermittent problems are caused by poor electrical connections or faulty wiring. In this case, careful checking of suspicious circuits may help prevent the replacement of good parts.

When is the Code Detected?

Circuit of front Left Input ABS solenoid is open or shorted, or control line is open or shorted to power supply or ground.

Need more information about the C1120 code?

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Code C1120 Information for Specific Makes

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 C1120 Code

1. What are common symptoms of OBDII code C1120 (Front Left Input ABS Solenoid)?

Common symptoms include the ABS warning light illuminating on the dashboard, decreased braking performance, and potential ABS system malfunctions.

2. What can cause OBDII code C1120 to trigger?

The code C1120 is typically triggered by a malfunction in the front left ABS solenoid, which may be caused by wiring issues, a faulty solenoid, or problems with the ABS control module.

3. How can I diagnose the cause of OBDII code C1120?

Diagnosing code C1120 involves using a diagnostic scanner to read the code, inspecting the front left ABS solenoid and its wiring for any visible damage, and testing the solenoid and related components for proper functionality.

4. What are some repair tips for fixing OBDII code C1120?

Repair tips include checking and repairing any damaged wiring, replacing the front left ABS solenoid if faulty, ensuring proper connections, and resetting the ABS system after repairs are made.

5. Can driving with OBDII code C1120 pose any risks?

Driving with OBDII code C1120 can pose risks, such as reduced braking efficiency and potential loss of ABS functionality, which can affect the vehicle's ability to maintain traction and stability during braking.

6. How important is it to address OBDII code C1120 promptly?

It is important to address OBDII code C1120 promptly to ensure the ABS system functions properly, maintain safe braking performance, and prevent potential safety hazards on the road.

7. Is it possible to clear OBDII code C1120 without fixing the issue?

Clearing the code without fixing the underlying issue may temporarily turn off the warning light, but the problem will persist, leading to ongoing ABS system malfunctions and potential safety risks.

8. Can OBDII code C1120 be intermittent?

Yes, OBDII code C1120 can be intermittent, with the ABS warning light appearing and disappearing sporadically as the issue with the front left ABS solenoid comes and goes.

9. How much does it typically cost to repair OBDII code C1120?

The cost to repair OBDII code C1120 can vary depending on the cause of the issue, the extent of the repairs needed, and labor rates. It is recommended to consult a professional mechanic for an accurate estimate.

10. Can OBDII code C1120 be prevented?

While some causes of OBDII code C1120 may be unavoidable, regular maintenance, prompt repairs of ABS system issues, and careful driving can help prevent the recurrence of this code.

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