C091F - Understanding the C091F Code in 2016-2020 Ford Explorer and Other Models

Quick Answer

C091F means: C091F indicates a communication issue within the steering assist system.

Fix: Check and replace faulty components Cost: $300 - $800 Time: 90-180 minutes

Can I drive with C091F? Immediate attention is recommended to ensure safe vehicle operation.

Common Questions

What does C091F mean and how does it affect my car?

The C091F code indicates that there is a communication problem within the steering assist system. This can lead to heavy steering, difficulty maneuvering, and may pose safety risks while driving. It's crucial to address this issue quickly to ensure safe vehicle operation.

What are the most common causes of C091F and how much does it cost to fix?

Common causes include a faulty steering assist control module, damaged wiring, and poor connections. Repair costs can range from $100 for simple wiring repairs to $800 for module replacement, depending on the issue.

Can I drive my car with C091F or should I stop immediately?

It's advisable to stop driving if the C091F code appears, as it indicates potential steering issues that could affect your ability to control the vehicle safely.

How can I diagnose C091F myself using GeekOBD APP?

You can use the GeekOBD APP to scan for the C091F code and any related codes. Analyze the freeze frame data to understand when the error occurred, and check for any abnormalities in the steering system parameters.

What vehicles are most commonly affected by C091F?

The C091F code is commonly reported in the 2016-2020 Ford Explorer, but it may also affect other vehicles with similar steering assist systems, such as the 2017-2020 Ford F-150.

How can I prevent C091F from happening again?

Regular vehicle maintenance, including checking wiring connections and performing software updates, can help prevent the C091F code from reappearing. Keeping the steering system clean and free from corrosion is also beneficial.

What is C091F?

The DTC C091F code indicates a fault in the vehicle's communication network, particularly related to the steering assist system. This diagnostic trouble code often arises in vehicles equipped with advanced steering technologies, such as the 2016-2020 Ford Explorer. The error signifies that the steering assist module is unable to communicate effectively with other control modules or sensors, which could lead to compromised steering performance. This malfunction may result in a range of issues, from a stiff steering wheel to complete loss of power steering. In real-world scenarios, drivers may experience difficulty maneuvering their vehicle, especially at lower speeds. Ignoring this code can lead to more severe steering problems, posing safety risks. Addressing a C091F code promptly is essential to maintain the vehicle's handling and overall safety. Drivers may also notice an illuminated warning light on the dashboard, which serves as an early indicator that something is amiss within the steering system. If this code is triggered, it's crucial to proceed with a thorough diagnosis to pinpoint the exact issue and take appropriate action.

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

Symptoms

Common symptoms when C091F is present:

  • The steering wheel feels unusually heavy or unresponsive, especially during low-speed maneuvers.
  • An illuminated check engine light or a steering warning light on the dashboard.
  • Drivers may notice a sudden loss of power steering assistance while driving, making it difficult to steer.
  • Unusual noises or vibrations coming from the steering column when turning the wheel.
  • Inconsistent steering response, where the steering may feel loose or overly tight at times.

Possible Causes

Most common causes of C091F (ordered by frequency):

  1. The most common cause of the C091F code is a faulty steering assist control module, which can occur in approximately 60% of cases. This module may fail due to electrical issues or software glitches.
  2. A second common cause is damaged or corroded wiring in the steering system. This can disrupt communication between components and is often exacerbated by environmental factors.
  3. Poor connections or loose plugs can also lead to C091F. Regular maintenance checks can help prevent this by ensuring all connections are secure.
  4. In rare cases, a defective steering angle sensor may cause this trouble code. This sensor is crucial for providing accurate data to the steering system.
  5. Lastly, although less common, software issues within the vehicle's control module can lead to communication failures, requiring a software update or reprogramming.

C091F Repair Costs

Cost Breakdown by Repair Type

Steering Assist Control Module Replacement

Replacing the steering assist control module if it's found to be faulty.

  • Total: $300 - $800
  • Success rate: 85%
Wiring Repair or Replacement

Repairing or replacing damaged wiring or connectors in the steering system.

  • Total: $100 - $300
  • Success rate: 75%
Software Update

Updating or reprogramming the vehicle's control module to fix communication issues.

  • Total: $50 - $150
  • Success rate: 90%
Money-Saving Tips for C091F
  • 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 C091F Diagnosis Process

Follow these systematic steps to accurately diagnose C091F. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Perform a visual inspection of the wiring and connectors related to the steering assist system

Step 1: Perform a visual inspection of the wiring and connectors related to the steering assist system. Look for any signs of damage 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: Use the GeekOBD APP to conduct an OBD2 scan

Step 2: Use the GeekOBD APP to conduct an OBD2 scan. Retrieve all related codes and freeze frame data to provide context for the C091F code (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: Test the steering assist control module using a multimeter to check for power and ground signals, ensuring the module is functioning correctly (20-30 minutes)

Step 3: Test the steering assist control module using a multimeter to check for power and ground signals, ensuring the module is functioning correctly (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: If any repairs were made, verify the system's functionality by performing a system function test and clearing the codes (10-15 minutes)

Step 4: If any repairs were made, verify the system's functionality by performing a system function test and clearing the codes (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: Conduct a road test under various driving conditions to confirm that the steering system operates normally and that the C091F code does not return (15-20 minutes)

Step 5: Conduct a road test under various driving conditions to confirm that the steering system operates normally and that the C091F code does not return (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: Steering Assist Control Module Replacement on a 2018 Ford Explorer

Vehicle: 2018 Ford Explorer, 45,000 miles

Problem: The driver reported a heavy steering wheel and an illuminated warning light.

Diagnosis: After scanning with the GeekOBD APP, the C091F code was confirmed. Visual inspection revealed a faulty steering assist control module.

Solution: The steering assist control module was replaced and the system was recalibrated.

Cost: $750 (module $600, labor $150)

Result: The vehicle's steering performance returned to normal, and the warning light was cleared.

Case Study 2: Wiring Repair on a 2017 Ford F-150

Vehicle: 2017 Ford F-150, 60,000 miles

Problem: The driver experienced sudden loss of power steering assistance.

Diagnosis: The GeekOBD APP indicated the C091F code. A thorough inspection revealed damaged wiring in the steering system.

Solution: Damaged wires were repaired, and the system was tested for functionality.

Cost: $200 (parts $50, labor $150)

Result: The power steering was restored, and the C091F code did not return after testing.

Diagnose C091F

Use GeekOBD APP for professional diagnosis!

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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: C091F
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes