Quick Answer
C0978 means: DTC C0978 refers to a malfunction in the Power Steering Control Module, affecting steering assistance.
Can I drive with C0978? Immediate attention is recommended to ensure safe vehicle operation.
Common Questions
What does C0978 mean and how does it affect my car?
C0978 indicates a malfunction in the Power Steering Control Module, which could make steering difficult, especially at low speeds. Long-term neglect of this issue can lead to more severe steering failures.
What are the most common causes of C0978 and how much does it cost to fix?
The most common causes include a faulty Power Steering Control Module and damaged wiring. Repair costs can range from $100 to $600 depending on the specific issue and necessary parts.
Can I drive my car with C0978 or should I stop immediately?
It's advisable to avoid driving the vehicle until the issue is resolved, as steering difficulties can pose a serious safety hazard.
How can I diagnose C0978 myself using GeekOBD APP?
You can use the GeekOBD APP to scan for codes, view live data, and freeze frame information, helping you pinpoint the issue before taking further action.
What vehicles are most commonly affected by C0978?
Commonly affected vehicles include the 2016-2020 Ford Explorer, as well as other models with similar electronic power steering systems. Always check for recalls or technical service bulletins.
How can I prevent C0978 from happening again?
Regular maintenance, including checking fluid levels and inspecting wiring and connections, can help prevent future occurrences of C0978.
What is C0978?
The diagnostic trouble code (DTC) C0978 indicates a malfunction in the Power Steering Control Module (PSCM). This code is particularly common in vehicles like the 2016-2020 Ford Explorer, but it can also appear in other models that utilize electronic power steering systems. Essentially, the PSCM is responsible for managing the power steering assist provided to the driver. If this module fails or detects a fault, it sends the C0978 code to the vehicle's onboard diagnostics system. The symptoms can range from a noticeable increase in steering effort (particularly at low speeds) to the complete loss of power steering assist. In severe cases, the steering may feel stiff, making it difficult to maneuver the vehicle safely. Ignoring this code could lead to more significant issues, including steering failure, which poses a serious safety risk while driving. The complexity of modern steering systems means that diagnosing and fixing the problem often requires specialized tools and knowledge, including access to the GeekOBD APP for accurate diagnostics and real-time data monitoring. Understanding this code is crucial for any vehicle owner, as timely intervention can not only restore vehicle performance but also prevent costly repairs in the future.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0978 is present:
- The check engine light illuminates on the dashboard, indicating a fault in the power steering system.
- Steering becomes excessively stiff, particularly when turning at low speeds, making it challenging to steer.
- Drivers may experience intermittent power steering assist, leading to fluctuating steering effort while driving.
- There may be a noticeable whining noise coming from the steering column when turning the wheel, indicating a potential issue.
- In some cases, the steering wheel may feel 'off-center' or require additional effort to stay straight.
Possible Causes
Most common causes of C0978 (ordered by frequency):
- The most common cause of DTC C0978 is a faulty Power Steering Control Module, which accounts for approximately 60% of cases. This module can fail due to wear or electrical issues.
- Another frequent cause is damaged wiring or poor connections within the power steering system, which can lead to inconsistent signals sent to the PSCM.
- A third possible cause is low power steering fluid levels, which can lead to overheating and subsequent failure of the power steering system. Regular fluid checks can help prevent this.
- Less commonly, a malfunctioning steering rack may contribute to this code, resulting in a more complex repair situation.
- In rare cases, software glitches in the vehicle's control module can trigger the C0978 code, necessitating a software update or reset.
C0978 Repair Costs
Cost Breakdown by Repair Type
Power Steering Control Module Replacement
Replacing the faulty Power Steering Control Module with a new or refurbished unit.
- Total: $300 - $600
- Success rate: 85%
Wiring Repair
Repairing or replacing damaged wiring or connectors within the power steering system.
- Total: $100 - $200
- Success rate: 75%
Money-Saving Tips for C0978
- 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 C0978 Diagnosis Process
Follow these systematic steps to accurately diagnose C0978. 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 in the power steering system (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion in the power steering system (5-10 minutes).
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).
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the Power Steering Control Module and associated components (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the Power Steering Control Module and associated components (20-30 minutes).
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).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm successful repair and ensure steering operates correctly (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm successful repair and ensure steering operates correctly (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: Power Steering Control Module Replacement on 2017 Ford Explorer
Vehicle: 2017 Ford Explorer, 65,000 miles
Problem: Customer reported difficulty steering and check engine light illuminated.
Diagnosis: Diagnostic scan revealed C0978; further testing showed a faulty Power Steering Control Module.
Solution: Replaced the Power Steering Control Module and performed a system reset.
Cost: $450 (including parts and labor)
Result: Steering was restored to normal function, and the check engine light was cleared.
Case Study 2: Wiring Repair on 2018 Ford Escape
Vehicle: 2018 Ford Escape, 40,000 miles
Problem: Driver noticed intermittent power steering assist and a whirring noise.
Diagnosis: After scanning for codes, C0978 was found; inspection revealed damaged wiring.
Solution: Repaired the damaged wiring and secured all connections.
Cost: $150 (including labor)
Result: Power steering assist returned to normal, and the symptoms were resolved.