C0591 - Understanding the Steering Column Control Module Code in GM Vehicles

Quick Answer

C0591 means: C0591 indicates a malfunction in the Steering Column Control Module, affecting steering functions.

Fix: Check and replace faulty components Cost: $300 - $600 Time: 90-180 minutes

Can I drive with C0591? Immediate attention is advised to prevent steering failure.

Common Questions

What does C0591 mean and how does it affect my car?

The C0591 code signifies a malfunction in the Steering Column Control Module, which can lead to steering issues. If not addressed, it may result in difficulty steering, warning lights, or even a complete steering failure, posing serious safety risks.

What are the most common causes of C0591 and how much does it cost to fix?

Common causes include a faulty Steering Column Control Module (costing $300 - $600 to replace) or wiring issues (repair costs ranging from $100 - $300). Ensuring these components are functioning properly is essential for safe vehicle operation.

Can I drive my car with C0591 or should I stop immediately?

Driving with a C0591 code can be dangerous, as it may lead to steering failure. It's advisable to stop driving and seek professional help as soon as possible to avoid potential accidents.

How can I diagnose C0591 myself using GeekOBD APP?

Using the GeekOBD APP, you can read the diagnostic codes and freeze frame data to gather context on the C0591 error. Follow the diagnostic steps outlined above to pinpoint the issue effectively.

What vehicles are most commonly affected by C0591?

The C0591 code is frequently encountered in 2014-2020 GM vehicles, including the Chevrolet Silverado and GMC Sierra. It's advisable to check for recalls or technical service bulletins related to steering systems in these models.

How can I prevent C0591 from happening again?

Regular maintenance of your vehicle's electrical systems and steering components can help prevent the C0591 code. Periodic inspections and using quality parts during repairs will also minimize the risk of future issues.

What is C0591?

The DTC C0591 is a diagnostic trouble code that indicates an issue with the Steering Column Control Module, primarily found in General Motors (GM) vehicles like the Chevrolet Silverado (2014-2020) and GMC Sierra (2014-2020). This code usually signifies that the control module is not communicating properly with the vehicle's computer system, leading to potential steering problems. When this code is triggered, it can result in various malfunctions, such as the inability to adjust the steering wheel or issues with the vehicle's stability control systems. The C0591 code is often accompanied by symptoms like the steering wheel lock, warning lights on the dashboard, or even reduced power steering assistance. In more severe cases, it could lead to a complete loss of steering control, posing significant safety risks. For car owners, it’s crucial to address this code promptly to prevent serious driving hazards and maintain the vehicle's performance. Ignoring this code could lead to higher repair costs down the line, as the underlying issues may worsen if not handled quickly.

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

Symptoms

Common symptoms when C0591 is present:

  • The dashboard warning lights illuminate, particularly the power steering warning indicator, alerting the driver to a potential steering issue.
  • Difficulty adjusting the steering wheel, indicating that the control module may not be functioning correctly.
  • Loss of power steering assistance, which can make steering feel heavier and more difficult, especially at low speeds.
  • Unusual noises from the steering column, such as clicking or grinding, suggesting that there may be mechanical issues.
  • Steering wheel lock-up during driving, which can be extremely dangerous and requires immediate attention.

Possible Causes

Most common causes of C0591 (ordered by frequency):

  1. The most common cause is a faulty Steering Column Control Module, which can fail due to electrical issues or internal malfunctions, with a likelihood of about 60%.
  2. Wiring problems, such as damaged or corroded connectors, can lead to communication failures between the module and the vehicle's computer system.
  3. Software glitches in the vehicle's control systems can also trigger the C0591 code; updating the vehicle's software can resolve this issue.
  4. Less common causes include issues within the power steering system, such as low fluid levels or pump failure, which can compound steering problems.
  5. Rarely, a failed steering angle sensor may set off this code, affecting the system's ability to detect the position of the steering wheel.

C0591 Repair Costs

Cost Breakdown by Repair Type

Steering Column Control Module Replacement

Replacing the faulty Steering Column Control Module with a new OEM or aftermarket part.

  • Total: $300 - $600
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring between the steering module and the vehicle's computer.

  • Total: $100 - $300
  • Success rate: 85%
Money-Saving Tips for C0591
  • 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 C0591 Diagnosis Process

Follow these systematic steps to accurately diagnose C0591. 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 or specific diagnostic tools to test suspected components, especially the Steering Column Control Module (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, especially the Steering Column Control Module (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 proper operation after repairs and clear codes using GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using GeekOBD APP (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 and ensure no codes reappear (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure no codes reappear (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 Lock-up Issue in 2017 Chevrolet Silverado

Vehicle: 2017 Chevrolet Silverado, 45,000 miles

Problem: The owner reported intermittent steering lock-up and dashboard warning lights.

Diagnosis: Upon scanning with the GeekOBD APP, the C0591 code was present. A visual inspection revealed damaged wiring at the steering column.

Solution: Repaired the wiring harness and replaced the Steering Column Control Module.

Cost: $450 (parts: $300 for module, $150 for wiring repairs)

Result: Post-repair, the vehicle was road-tested, and no further issues were found; steering functionality was restored.

Case Study 2: Power Steering Failure in 2016 GMC Sierra

Vehicle: 2016 GMC Sierra, 60,000 miles

Problem: Customer complained of heavy steering and dashboard alerts.

Diagnosis: Diagnostic testing indicated a C0591 code, and further examination revealed the Steering Column Control Module was faulty.

Solution: Replaced the Steering Column Control Module with an OEM part.

Cost: $500 (module cost: $400, labor: $100)

Result: The vehicle's steering performance returned to normal after the repair, with no warning lights reappearing.

Diagnose C0591

Use GeekOBD APP for professional diagnosis!

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

Code: C0591
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes