Safety Warning
- Do not drive at highway speeds - steering may fail completely without warning
- Electric power steering systems contain high voltage components - avoid DIY repairs
- Vehicle may have unpredictable steering response during emergency maneuvers
- Have vehicle towed to repair facility if steering becomes completely inoperative
Quick Diagnosis Summary
If your 2019 Ford Fusion Hybrid is displaying diagnostic trouble code C0040, you're dealing with a serious electric power steering (EPS) system failure that requires immediate attention. This code specifically indicates a malfunction in the electric power steering motor or its control systems, which can lead to complete steering failure without warning.
The C0040 code is particularly concerning because it affects your vehicle's safety and drivability. Unlike traditional hydraulic power steering systems, the electric power steering in your Fusion Hybrid relies entirely on electronic components and motors, making it more susceptible to sudden failures that can leave you with extremely heavy steering or complete loss of power assistance.
What Does Code C0040 Mean in Your Ford Fusion Hybrid?
Code C0040 translates to "Electric Power Steering Motor Circuit Malfunction" in Ford vehicles. This diagnostic trouble code triggers when the vehicle's computer detects an electrical problem within the EPS motor circuit, including issues with the motor itself, its control module, or associated wiring and sensors.
In your 2019 Ford Fusion Hybrid, the EPS system uses a brushless electric motor mounted on the steering column to provide power assistance. When this system fails and triggers C0040, it means the motor cannot provide the necessary torque assistance, making steering significantly more difficult.
Symptoms of Electric Power Steering Failure (C0040)
Ford Fusion Hybrid owners experiencing C0040 code typically notice several distinct symptoms:
- Magnetic stepping sensation: The steering wheel feels like it's moving in small, discrete steps rather than smoothly, especially noticeable when making small corrections
- Heavy steering effort: Turning the wheel requires significantly more physical force, particularly at low speeds or when parking
- Intermittent power assistance: The steering may work normally one moment and become heavy the next
- Symptoms persist with engine off: Unlike hydraulic systems, EPS problems often remain evident even when the vehicle isn't running
- Warning lights: Power steering warning light illuminated on the dashboard
- Unusual noises: Clicking, grinding, or whirring sounds from the steering column area
- Poor steering return: The steering wheel doesn't naturally return to center after turning
Common Causes of C0040 Code in 2019 Ford Fusion Hybrid
Electric Power Steering Motor Failure (Most Common)
The brushless electric motor in your Fusion Hybrid's EPS system is the most likely culprit when C0040 appears. These motors contain internal components like brushes, encoders, and magnetic sensors that can fail over time. The stepping sensation you feel is often caused by the motor's encoder failing to provide smooth position feedback, causing the motor to move in discrete steps rather than continuous motion.
Power Steering Control Module Malfunction
The EPS control module acts as the brain of the power steering system, interpreting input from various sensors and commanding the motor accordingly. When this module malfunctions, it may send erratic signals to the EPS motor, creating the characteristic stepping sensation. Module failures can be caused by electrical surges, moisture intrusion, or internal component degradation.
EPS Motor Position Sensor Failure
The position sensor tells the control module exactly where the steering wheel is positioned and how fast it's moving. Ford EPS systems are particularly sensitive to position sensor failures, which can cause the system to lose track of steering input and respond unpredictably. This is a known issue in many Ford vehicles from this era.
Wiring and Connector Issues
The high-current electrical connections in the EPS system can corrode or become loose over time, especially in hybrid vehicles where electrical systems are more complex. Poor connections can cause intermittent failures and trigger the C0040 code.
Professional Diagnosis of C0040 Code
Proper diagnosis of C0040 requires specialized equipment and expertise. A qualified technician will:
- Use advanced scan tools to read live data from the EPS system
- Perform electrical testing of the motor circuit and control module
- Check for additional codes that might indicate related problems
- Test the motor's resistance and current draw
- Inspect wiring harnesses and connectors for damage or corrosion
- Verify proper operation of position sensors and feedback circuits
The diagnosis process is critical because similar symptoms can result from different causes, and replacing the wrong component can be extremely costly.
Repair Options for C0040 Electric Power Steering Failure
Professional Repair (Recommended)
Due to the safety-critical nature of steering systems and the complexity of electric power steering components, professional repair is strongly recommended for C0040 issues. Typical repairs include:
- EPS Motor Replacement: Most common solution, involves removing the steering column and installing a new or remanufactured motor assembly
- Control Module Replacement: May require programming to match your specific vehicle
- Position Sensor Replacement: Often integrated into the motor assembly
- Wiring Harness Repair: Less common but necessary when electrical connections are damaged
Why DIY Repair Isn't Recommended
Electric power steering repair is not suitable for DIY mechanics due to:
- Safety risks from high-voltage electrical components in hybrid vehicles
- Need for specialized tools and diagnostic equipment
- Requirement for precise calibration after installation
- Risk of airbag deployment when working on steering column
- Potential for complete steering failure if improperly repaired
Cost Breakdown for C0040 Repairs
Repair costs for C0040 electric power steering failure typically range from $800 to $1500, depending on the specific cause:
- EPS Motor Replacement: $900-$1400 (includes labor)
- Control Module Replacement: $600-$1000
- Position Sensor Replacement: $400-$800
- Diagnostic Fee: $100-$150
- Programming/Calibration: $50-$100
These costs can vary significantly based on your location, whether you choose OEM or aftermarket parts, and labor rates at different shops. Some repairs may be covered under Ford's powertrain warranty if your vehicle is still within the coverage period.
Prevention and Maintenance Tips
While electric power steering systems require minimal maintenance compared to hydraulic systems, you can take steps to extend their life:
- Avoid extreme steering wheel positions for extended periods
- Don't hold the steering wheel at full lock while stationary
- Address electrical issues promptly to prevent voltage spikes
- Keep the steering column area clean and dry
- Have the system inspected during regular maintenance
- Watch for early warning signs like unusual noises or heavy steering
Safety Considerations with C0040 Code
Critical Safety Warning: Do not drive at highway speeds when experiencing C0040 symptoms. The electric power steering can fail completely without warning, leaving you with extremely heavy steering that could cause loss of vehicle control.
If you must drive the vehicle, keep speeds low and avoid highway driving. Consider having the vehicle towed to a repair facility if steering becomes completely inoperative or unpredictable.
Frequently Asked Questions
You should avoid driving at highway speeds with C0040 code. While the vehicle may still be steerable, the electric power steering can fail completely without warning. If you must drive, keep speeds low and avoid busy roads. Have the vehicle towed to a repair facility if steering becomes completely inoperative.
Repair costs typically range from $800 to $1500 depending on the specific cause. EPS motor replacement is the most common repair, costing $900-$1400 including labor. Control module replacement costs $600-$1000, while position sensor replacement ranges from $400-$800.
The stepping sensation is typically caused by a failing encoder or position sensor in the EPS motor. Instead of providing smooth feedback, the faulty sensor causes the motor to move in discrete steps. This can also result from a malfunctioning control module sending erratic signals to the motor.
C0040 repairs may be covered under Ford's powertrain warranty if your 2019 Fusion Hybrid is still within the coverage period. The powertrain warranty typically covers 5 years or 60,000 miles. Check with your Ford dealer to determine if your specific issue qualifies for warranty coverage.
While you can clear the C0040 code with an OBD-II scanner, this won't fix the underlying problem. The code will return as soon as the system detects the failure again. Clearing codes without proper repair can be dangerous as it removes the warning that alerts you to the steering system problem.
Unlike hydraulic power steering systems that only operate when the engine is running, electric power steering systems can remain partially active even with the engine off. This allows the symptoms of EPS failure, including the stepping sensation, to be noticeable even when the vehicle isn't running.