C056C - Understanding the Steering System Malfunction in Chevrolet and GMC Vehicles

Quick Answer

C056C means: C056C indicates a malfunction in the Electronic Power Steering system, specifically in the steering control module.

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

Can I drive with C056C? Immediate attention is advised to ensure safe vehicle operation.

Common Questions

What does C056C mean and how does it affect my car?

The C056C code signifies a malfunction in the power steering system, particularly the control module. This can lead to heavier steering and decreased vehicle handling, making it crucial to address promptly for safe driving.

What are the most common causes of C056C and how much does it cost to fix?

Common causes include a faulty steering control module, wiring issues, and sensor malfunctions. Repair costs typically range from $100 for wiring repairs to $800 for module replacement, depending on the issue.

Can I drive my car with C056C or should I stop immediately?

While you may be able to drive short distances, it's not advisable to ignore this code. Heavy steering can lead to accidents and further vehicle damage, so seeking immediate repair is recommended.

How can I diagnose C056C myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for codes, check freeze frame data, and monitor the performance of the EPS system. Look for any other related trouble codes that may help pinpoint the issue.

What vehicles are most commonly affected by C056C?

Commonly affected models include the 2014-2018 Chevrolet Silverado, 2015-2019 GMC Sierra, and similar models from these manufacturers. It's important to check for any recalls or service bulletins related to EPS issues.

How can I prevent C056C from happening again?

Regular maintenance, including checking electrical connections and software updates, can help prevent future occurrences of C056C. Keeping an eye on steering responsiveness can also alert you to potential problems early.

What is C056C?

The C056C diagnostic trouble code is primarily associated with the Electronic Power Steering (EPS) system in certain Chevrolet and GMC models, including popular vehicles like the 2014-2018 Chevrolet Silverado and the 2015-2019 GMC Sierra. This code indicates that there is a malfunction in the steering control module, which can lead to various steering issues. When this code is triggered, it typically means that the vehicle's EPS system has detected an internal fault, which could be due to a range of factors including software glitches, hardware failures, or sensor issues. If the C056C code is present, you may notice that the steering feels heavier than usual, or in some cases, the power steering may fail completely, making it difficult and unsafe to drive the vehicle. Ignoring this code can lead to further damage and possibly unsafe driving conditions, as steering responsiveness is crucial for vehicle control. Thus, addressing the C056C code promptly is essential for maintaining the safety and performance of your vehicle.

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

Symptoms

Common symptoms when C056C is present:

  • The check engine light or power steering warning light illuminates on the dashboard, indicating a system malfunction.
  • Steering feels unusually heavy, especially at low speeds, making it difficult to maneuver the vehicle.
  • The vehicle may exhibit inconsistent steering response, where it feels unresponsive or overly sensitive at times.
  • There's an increase in the effort required to turn the steering wheel, which can lead to driver fatigue during longer trips.
  • In some cases, the power steering may completely fail, resulting in a loss of assistance and making the vehicle hard to steer.

Possible Causes

Most common causes of C056C (ordered by frequency):

  1. The most common cause of the C056C code is a faulty steering control module, which is responsible for regulating the power steering system. This accounts for about 60% of cases.
  2. Another potential cause could be issues with the EPS wiring harness, such as damaged wires or poor connections, which can interfere with communication between components.
  3. Sensor malfunctions, particularly those related to steering position or torque sensors, can also trigger this code, leading to erratic steering behavior.
  4. Less common but serious causes include software issues requiring a reprogramming of the EPS module, which can often be resolved with a dealership visit.
  5. Rarely, the problem may stem from mechanical failures within the steering system, such as a malfunctioning power steering pump or steering gear.

C056C Repair Costs

Cost Breakdown by Repair Type

Steering Control Module Replacement

Replacing the faulty steering control module with a new one to restore function.

  • Total: $400 - $800
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring in the EPS system.

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

Reprogramming the steering control module if a software issue is suspected.

  • Total: $100 - $200
  • Success rate: 80%
Money-Saving Tips for C056C
  • 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 C056C Diagnosis Process

Follow these systematic steps to accurately diagnose C056C. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for damaged wiring, loose connections, or corrosion in the EPS system components (5-10 minutes)

Step 1: Initial visual inspection - Check for damaged wiring, loose connections, or corrosion in the EPS system components (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 - Use the app to retrieve the C056C code along with any other related codes and freeze frame data (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Use the app to retrieve the C056C code along with any other related codes and freeze frame data (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 - Employ a multimeter to check the voltage and ground at the steering control module and inspect related sensors for proper functioning (20-30 minutes)

Step 3: Component testing - Employ a multimeter to check the voltage and ground at the steering control module and inspect related sensors for proper functioning (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 - After any repairs, verify the operation of the EPS system by turning the steering wheel under various conditions and clearing the code (10-15 minutes)

Step 4: System function test - After any repairs, verify the operation of the EPS system by turning the steering wheel under various conditions and clearing the 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 5: Step 5: Road test verification - Drive the vehicle to ensure that the steering feels normal and that the C056C code does not return (15-20 minutes)

Step 5: Road test verification - Drive the vehicle to ensure that the steering feels normal and that the C056C 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 Control Module Replacement on a 2016 Chevrolet Silverado 1500

Vehicle: 2016 Chevrolet Silverado 1500, 45,000 miles

Problem: Customer reported heavy steering and illuminated power steering light.

Diagnosis: Using the GeekOBD APP, retrieved C056C code and confirmed steering control module failure after visual inspection.

Solution: Replaced the steering control module and reprogrammed it, restoring normal function.

Cost: $600 (parts: $400, labor: $200)

Result: Steering returned to normal function with no further issues reported.

Case Study 2: Wiring Repair on a 2017 GMC Sierra 2500 HD

Vehicle: 2017 GMC Sierra 2500 HD, 30,000 miles

Problem: Customer experienced intermittent power steering issues and C056C code appeared.

Diagnosis: After scanning with GeekOBD and inspecting wiring, found damaged harness near the steering column.

Solution: Repaired the wiring harness and cleared the code.

Cost: $150 (parts: $50, labor: $100)

Result: Power steering issues resolved and no code returned after road testing.

Diagnose C056C

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
Download GeekOBD APP Get MOBD Adapter

Code Information

Code: C056C
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes