C0F42 - Understanding the Code: Common in 2015-2020 Ford and Honda Models

Quick Answer

C0F42 means: C0F42 indicates a problem with the electric power steering system, often leading to increased steering effort.

Fix: Check and replace faulty components Cost: $300 - $600 Time: 90-180 minutes

Can I drive with C0F42? Immediate attention is recommended to avoid safety risks while driving.

Common Questions

What does C0F42 mean and how does it affect my car?

C0F42 signifies a problem with your vehicle's electric power steering system, which affects how easily you can steer your car. If this code appears, it may lead to heavy steering or even a complete loss of steering assist, making driving difficult and potentially unsafe.

What are the most common causes of C0F42 and how much does it cost to fix?

Common causes include wiring issues, faulty control modules, and sensor malfunctions. Repair costs can range from $150 for wiring repairs to $1,200 for a power steering motor replacement, depending on the specific problem.

Can I drive my car with C0F42 or should I stop immediately?

It is not safe to drive your vehicle if you see the C0F42 code. Heavy or unresponsive steering can pose serious safety risks. It is advisable to address the issue promptly.

How can I diagnose C0F42 myself using GeekOBD APP?

Using the GeekOBD APP, connect to your vehicle's OBD2 port to read diagnostic codes. The app will provide you with the C0F42 code and related freeze frame data, which can help you understand the severity of the issue and guide your next steps.

What vehicles are most commonly affected by C0F42?

C0F42 is often found in 2015-2020 Ford vehicles and certain Honda models. It's important to check for any recalls or technical service bulletins (TSBs) related to your specific vehicle model.

How can I prevent C0F42 from happening again?

Regular maintenance checks, including inspecting wiring and connectors for wear and tear, can help prevent C0F42 from recurring. Additionally, keeping the steering system components clean and functioning properly can also reduce the risk.

What is C0F42?

DTC C0F42 is a diagnostic trouble code that indicates a fault in the vehicle's electric power steering (EPS) system. Specifically, it usually points to an issue with the power steering assist or the control module responsible for regulating the EPS system. This code can be triggered by various factors, including faulty sensors, wiring issues, or a malfunctioning steering assist motor. When this code appears, drivers may experience symptoms such as heavy steering, a warning light on the dashboard, or even a complete loss of power steering assist. Understanding the implications of C0F42 is crucial for maintaining vehicle safety and performance. If left unaddressed, it might not only affect driving comfort but could also lead to further damage to the steering system, resulting in more extensive repairs. It's important to act promptly if DTC C0F42 is stored in your vehicle’s computer, as driving with impaired steering can be dangerous. Regular diagnostics and timely repairs can help prevent the recurrence of this issue and ensure your vehicle remains safe and responsive on the road.

System: C - Chassis (ABS, Steering, Suspension)

Symptoms

Common symptoms when C0F42 is present:

  • The check engine light remains illuminated on the dashboard, indicating a persistent issue that requires attention.
  • Steering feels unusually heavy, especially during low-speed maneuvers, making it difficult to steer the vehicle.
  • Drivers may notice a sudden loss of power steering assist, causing the vehicle to feel unmanageable, particularly when turning.
  • Unusual noises coming from the steering column when turning the wheel might also occur, suggesting mechanical issues.
  • Inconsistent steering response can be felt, leading to unpredictable handling and increased driver fatigue.

Possible Causes

Most common causes of C0F42 (ordered by frequency):

  1. Wiring issues, such as frayed or corroded connections, are the most common cause (approximately 40%). These can interfere with the signal between the EPS control unit and the steering assist motor.
  2. A faulty power steering control module can also trigger C0F42, leading to improper functioning of the EPS system. This issue typically arises due to manufacturing defects or wear over time.
  3. Sensor malfunctions, particularly those related to the steering angle or torque sensor, can lead to erroneous readings and trigger the C0F42 code. Regular inspections can help prevent this.
  4. Less common causes include software glitches within the vehicle's onboard computer systems, which may require a software update to resolve.
  5. Rarely, complete failure of the power steering assist motor can occur, requiring immediate replacement to restore proper steering functionality.

C0F42 Repair Costs

Cost Breakdown by Repair Type

Power Steering Control Module Replacement

Replacing the control module to restore proper communication within the EPS system.

  • Total: $300 - $600
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring or connectors that affect the EPS system.

  • Total: $150 - $300
  • Success rate: 90%
Power Steering Motor Replacement

In cases of motor failure, replacing the power steering motor to restore functionality.

  • Total: $600 - $1,200
  • Success rate: 80%
Money-Saving Tips for C0F42
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional C0F42 Diagnosis Process

Follow these systematic steps to accurately diagnose C0F42. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter to test the EPS control module and related wiring for continuity and proper voltage (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the EPS control module and related wiring for continuity and proper voltage (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm successful repairs and check for reoccurrence of the code (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm successful repairs and check for reoccurrence of the code (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Ford Fusion C0F42 Diagnosis and Repair

Vehicle: 2017 Ford Fusion, 45,000 miles

Problem: Customer reported heavy steering and illuminated warning light.

Diagnosis: OBD2 scan revealed code C0F42. Visual inspection showed corroded wiring at the EPS control module.

Solution: Repaired damaged wiring and replaced the power steering control module.

Cost: $480 (parts: $300 for module, $180 for labor)

Result: Steering response returned to normal, and no further codes were detected after a road test.

Case Study 2: Honda Civic C0F42 Troubleshooting

Vehicle: 2019 Honda Civic, 30,000 miles

Problem: Customer experienced sudden loss of power steering assist.

Diagnosis: C0F42 was the only code present. Tested the power steering motor, which was found to be faulty.

Solution: Replaced the power steering motor and recalibrated the system.

Cost: $800 (parts: $600 for motor, $200 for labor)

Result: The vehicle's steering function was restored, and the customer reported satisfaction with the repair.

Diagnose C0F42

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: C0F42
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes