Quick Answer
C0A79 means: C0A79 indicates a problem in the power steering control system, affecting steering assist.
Can I drive with C0A79? Immediate attention is recommended to ensure safe vehicle operation.
Common Questions
What does C0A79 mean and how does it affect my car?
The C0A79 code indicates a malfunction in your vehicle's power steering control system. This can lead to issues with steering assist, making it harder to turn the steering wheel, particularly at slow speeds. If ignored, it could result in unsafe driving conditions.
What are the most common causes of C0A79 and how much does it cost to fix?
Common causes include a faulty power steering control module, which can cost between $300 and $600 to replace. Other causes, like a malfunctioning steering angle sensor, may cost around $150 to $300. It's essential to get a proper diagnosis for accurate repair costs.
Can I drive my car with C0A79 or should I stop immediately?
While you may be able to drive your vehicle short distances, it's advisable to avoid driving until the issue is resolved. The loss of steering assist can lead to dangerous situations, particularly in emergencies or tight driving conditions.
How can I diagnose C0A79 myself using GeekOBD APP?
Start by connecting the GeekOBD APP to your vehicle's OBD2 port. Run a full scan to retrieve DTCs and freeze frame data. Pay attention to related codes and symptom descriptions to pinpoint the issue.
What vehicles are most commonly affected by C0A79?
This code is frequently seen in models like the 2016-2020 Ford Fusion, but it can also affect other Ford vehicles with electric power steering systems. Always check for recalls or technical service bulletins related to your specific model.
How can I prevent C0A79 from happening again?
Regular maintenance is key to preventing C0A79. Ensure your vehicle's electrical system is inspected, keep your steering components lubricated, and stay updated on software updates from your manufacturer.
What is C0A79?
The diagnostic trouble code (DTC) C0A79 indicates a malfunction in the power steering control system. This code typically triggers when the vehicle's onboard computer detects a problem with the electric power steering (EPS) system. Affected vehicles, such as the 2016-2020 Ford Fusion, may experience issues that limit steering assist, leading to heavy steering or difficulty maneuvering. This can be particularly concerning during low-speed maneuvers or tight turns. Drivers may notice that the steering feels unresponsive or requires more effort, which can compromise vehicle safety. The EPS system relies on various sensors and actuators to provide the necessary steering assistance, and a fault in any of these components can trigger the C0A79 code. Common symptoms include a warning light on the dashboard, typically the 'Power Steering' light, and potential steering stiffness. Addressing this issue promptly is crucial, as ignoring it could lead to further complications, including damage to the steering system or increased difficulty in driving. Understanding the nature of this code and its implications is the first step in ensuring the safety and performance of your vehicle.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0A79 is present:
- The power steering warning light illuminates on the dashboard, alerting the driver to a potential issue.
- Steering feels unusually heavy or unresponsive, especially during low-speed turns or parking.
- Drivers may experience difficulty maneuvering, particularly in tight spaces or during sharp turns.
- Inconsistent steering feedback, where the steering wheel may feel loose or too tight at times.
- Unusual noises, such as whining or grinding, may occur when turning the steering wheel.
Possible Causes
Most common causes of C0A79 (ordered by frequency):
- The most common cause is a faulty power steering control module, which accounts for about 40% of cases. This module can fail due to electrical shorts or software issues.
- Another prevalent issue is a malfunctioning steering angle sensor, which is crucial for accurate steering input. Its failure can lead to steering assist problems.
- Worn or damaged steering components, such as the rack and pinion, can contribute to the C0A79 code. Regular inspections and maintenance can help prevent this.
- Less common but serious causes include electrical wiring issues, such as frayed or corroded wires that disrupt power to the EPS system, potentially leading to complete loss of steering assist.
- A rare but possible cause could be a software glitch in the vehicle's ECU, which may require a software update or reprogramming to resolve.
C0A79 Repair Costs
Cost Breakdown by Repair Type
Power Steering Control Module Replacement
Replacing the faulty power steering control module with a new or remanufactured unit.
- Total: $300 - $600
- Success rate: 85%
Steering Angle Sensor Replacement
Replacing a malfunctioning steering angle sensor to restore proper EPS function.
- Total: $150 - $300
- Success rate: 75%
Money-Saving Tips for C0A79
- 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 C0A79 Diagnosis Process
Follow these systematic steps to accurately diagnose C0A79. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for obvious signs such as damaged wiring, loose connections, or corrosion, which may take about 5-10 minutes
Step 1: Initial visual inspection - Check for obvious signs such as damaged wiring, loose connections, or corrosion, which may take about 5-10 minutes.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context, typically taking 10-15 minutes
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context, typically taking 10-15 minutes.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the power steering control module and sensors, which can take 20-30 minutes
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the power steering control module and sensors, which can take 20-30 minutes.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes to ensure the issue is resolved, taking approximately 10-15 minutes
Step 4: System function test - Verify proper operation after repairs and clear codes to ensure the issue is resolved, taking approximately 10-15 minutes.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success, which may take 15-20 minutes
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success, which may take 15-20 minutes.
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: 2018 Ford Fusion Power Steering Control Module Replacement
Vehicle: 2018 Ford Fusion, 45,000 miles
Problem: Customer reported heavy steering and illuminated power steering warning light.
Diagnosis: After scanning with the GeekOBD APP, code C0A79 was confirmed. Visual inspection revealed corrosion on the power steering control module connections.
Solution: Replaced the power steering control module and cleaned all connections. Conducted a function test.
Cost: $450 (parts: $300 for module, $150 for labor)
Result: Customer reported smooth steering post-repair and no further issues.
Case Study 2: 2017 Ford Explorer Steering Angle Sensor Replacement
Vehicle: 2017 Ford Explorer, 60,000 miles
Problem: Driver experienced intermittent power steering assist and C0A79 code appeared.
Diagnosis: Used the GeekOBD APP for diagnostics, which pointed to a faulty steering angle sensor.
Solution: Replaced the steering angle sensor and recalibrated the system.
Cost: $200 (parts: $150 for sensor, $50 for labor)
Result: The steering assist returned to normal, and the code did not reappear.