C0903 - Steering Control Module Fault in 2015-2020 Ford Explorer and Other Models

Quick Answer

C0903 means: C0903 indicates a fault in the steering control module's communication.

Fix: Check and replace faulty components Cost: $400 - $800 Time: 90-180 minutes

Can I drive with C0903? Immediate attention is recommended to ensure safe vehicle operation.

Common Questions

What does C0903 mean and how does it affect my car?

C0903 signifies a communication fault in the steering control module. This can lead to heavy steering, loss of power assist, and even potential safety hazards. Addressing this issue promptly is crucial for maintaining vehicle control.

What are the most common causes of C0903 and how much does it cost to fix?

The primary causes of C0903 include a faulty steering control module, wiring issues, and software glitches, with repair costs ranging from $100 for wiring fixes to $800 for a complete module replacement.

Can I drive my car with C0903 or should I stop immediately?

While it might be possible to drive short distances, it is not advisable due to the high risk of losing steering control. Immediate diagnosis and repair are recommended.

How can I diagnose C0903 myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for DTCs, view live data, and analyze freeze frame data to identify symptoms related to C0903. This will help you understand potential issues with the steering control module.

What vehicles are most commonly affected by C0903?

C0903 is frequently encountered in 2015-2020 Ford Explorer models, but it can also affect other vehicles equipped with electronic power steering systems.

How can I prevent C0903 from happening again?

Regular vehicle maintenance, including checking wiring connections and ensuring the steering system is free from corrosion, can help prevent C0903. Additionally, keeping software up to date is essential.

What is C0903?

The diagnostic trouble code (DTC) C0903 indicates that there is a fault in the steering control module's communication. This code often appears in vehicles like the 2015-2020 Ford Explorer, but it can also affect various models across different manufacturers. The steering control module is responsible for managing the power steering system, which is crucial for vehicle handling. When the C0903 code is triggered, it means the module is not receiving or sending the correct signals, which can lead to issues such as a lack of power assistance or erratic steering response. This can manifest as difficulty steering, steering wheel feedback, or even a complete loss of power steering, especially in tight turns or during parking maneuvers. Ignoring this code could lead to more severe issues, including potential accidents or increased wear on the steering components. Therefore, it's essential for vehicle owners to understand the implications of this code and seek repairs promptly to ensure safe driving conditions.

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

Symptoms

Common symptoms when C0903 is present:

  • Check engine light illuminates or flashes, indicating a fault in the steering system.
  • Steering feels heavy or unresponsive, particularly during low-speed maneuvers.
  • Unusual noises from the steering column, such as whining or grinding sounds.
  • Intermittent loss of power steering assistance, making it difficult to steer the vehicle.
  • Dashboard warning messages related to the steering system appear intermittently.

Possible Causes

Most common causes of C0903 (ordered by frequency):

  1. Faulty steering control module - 40% likelihood, often due to electrical issues or water intrusion.
  2. Wiring issues or damaged connectors - 30% likelihood, which can result from wear and tear or improper installations.
  3. Software glitches in the module - 20% likelihood, potentially needing a software update or reset.
  4. Less common but serious cause: Defective power steering pump, which can lead to complete steering failure.
  5. Rare but possible cause: Corrosion in the control module connectors, affecting signal transmission.

C0903 Repair Costs

Cost Breakdown by Repair Type

Steering Control Module Replacement

Replacing the faulty steering control module to restore normal steering function.

  • Total: $400 - $800
  • Success rate: 85%
Wiring Repair

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

  • Total: $100 - $300
  • Success rate: 70%
Software Update

Updating the steering control module software to resolve communication issues.

  • Total: $50 - $150
  • Success rate: 60%
Money-Saving Tips for C0903
  • 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 C0903 Diagnosis Process

Follow these systematic steps to accurately diagnose C0903. 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 steering control module and connectors for proper voltage and continuity (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the steering control module and connectors for proper voltage and continuity (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 the proper operation of the steering system after repairs and clear codes (10-15 minutes)

Step 4: System function test - Verify the proper operation of the steering system after repairs and clear 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: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (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 Control Module Replacement in a 2017 Ford Explorer

Vehicle: 2017 Ford Explorer, 75,000 miles

Problem: Customer reported heavy steering and intermittent loss of power assist.

Diagnosis: Diagnostics revealed C0903 due to a faulty steering control module.

Solution: Replaced the steering control module and updated the software.

Cost: $650 (module $550, labor $100)

Result: Steering performance restored to normal with no further issues.

Case Study 2: Wiring Repair on a 2016 Honda Pilot

Vehicle: 2016 Honda Pilot, 85,000 miles

Problem: Vehicle displayed C0903 and experienced unusual steering noises.

Diagnosis: Inspection found damaged wiring harness causing communication failure.

Solution: Repaired the wiring harness and secured connections.

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

Result: No further symptoms reported, steering system functioning properly.

Diagnose C0903

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: C0903
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes