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Engine-Codes – Generic – C1304

C1304 Code - EPS Control System Malfunction

Quick Answer

The C1304 diagnostic trouble code (DTC) refers to an EPS (Electric Power Steering) control system malfunction. Common causes include Faulty EPS motor, Electrical issues such as wiring damage or a blown fuse, Sensor malfunction. 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
C1304 indicates EPS Control System Malfunction.
Common causes
Common causes include Faulty EPS motor, Electrical issues such as wiring damage or a blown fuse, Sensor malfunction.
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 Sep 09, 2024
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Code C1304 Description

The C1304 diagnostic trouble code (DTC) refers to an EPS (Electric Power Steering) control system malfunction. The EPS system is responsible for providing assistance to the driver in steering the vehicle by utilizing an electric motor rather than traditional hydraulic systems. When this code appears, it indicates that there is a problem with the EPS control system, which can affect the vehicle's steering performance and safety.

OBDII Code C1304 - EPS Control System Malfunction
C1304 Code - EPS Control System Malfunction

Common Causes of C1304

  1. Faulty EPS motor
  2. Electrical issues such as wiring damage or a blown fuse
  3. Sensor malfunction
  4. Poor connection between components
  5. Software issues in the EPS control unit

Symptoms of C1304

  1. Erratic steering behavior
  2. Difficulty turning the steering wheel
  3. Loss of power steering assistance
  4. Illumination of the EPS warning light on the dashboard

How to Fix C1304

  1. Diagnose the specific cause of the EPS control system malfunction using a diagnostic scanner to retrieve the trouble codes and pinpoint the issue.
  2. Inspect the electrical connections and wiring harness for any damage or corrosion, repairing or replacing as necessary.
  3. Test the EPS motor and sensors to ensure they are functioning correctly, replacing any faulty components.
  4. Update the software in the EPS control unit if needed to address any programming issues.
  5. Clear the trouble codes and test drive the vehicle to ensure the steering system is operating properly.

Cost to Fix C1304

The typical repair costs for an EPS control system malfunction can vary depending on the specific issue causing the code to trigger. In general, parts for this repair can range from $200 to $800, while labor costs can be anywhere from $100 to $300. Overall, you can expect to pay between $300 and $1100 for this repair, including parts and labor. However, it's important to note that these costs can vary based on factors such as location, vehicle make and model, and the shop's labor rates. It's recommended to get quotes from multiple auto repair shops to find the best price for your specific situation.

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Code C1304 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 C1304 Code

1. What does OBDII code C1304 mean?

C1304 indicates a malfunction in the Electric Power Steering (EPS) control system, which affects the vehicle's steering assist functionality.

2. What are the common symptoms of code C1304?

Symptoms include a loss of power steering assist, heavy or unresponsive steering, an illuminated EPS or check engine light, and possible warning messages on the dashboard.

3. What causes code C1304 to trigger?

This code is often caused by a faulty EPS control module, loose or damaged wiring, poor electrical connections, or issues with the steering angle sensor.

4. Can I drive my car with a C1304 code?

You can drive the car, but steering may require significantly more effort, especially at low speeds. It’s recommended to fix the issue promptly for safety.

5. How is code C1304 diagnosed?

A technician will use a scan tool to read the code, inspect the EPS system for wiring or connection issues, and test the EPS control module and related sensors.

6. How do you fix an EPS control system malfunction (C1304)?

Repairs may involve replacing the EPS control module, repairing damaged wiring, cleaning corroded connections, or recalibrating the steering angle sensor.

7. How much does it cost to fix OBDII code C1304?

Repair costs vary depending on the issue but can range from $100 for minor wiring repairs to $1,000 or more if the EPS control module needs replacement.

8. Can a dead battery cause C1304 to appear?

Yes, a weak or dead battery can cause voltage drops that may affect the EPS system and trigger the C1304 code.

9. Does the C1304 code require recalibration after repairs?

Yes, recalibrating the steering angle sensor or EPS system may be necessary after repairs to ensure proper functionality.

10. Can clearing the C1304 code solve the problem?

Clearing the code may turn off the warning temporarily, but if the underlying issue isn’t resolved, the code is likely to return.

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