C0401 - Understanding the Power Steering Control Module Error in 2015-2018 Chevy Silverado

Quick Answer

C0401 means: DTC C0401 refers to a malfunction in the Power Steering Control Module.

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

Can I drive with C0401? Immediate inspection is recommended as steering issues can lead to safety risks.

Common Questions

What does C0401 mean and how does it affect my car?

The C0401 code indicates a malfunction in the Power Steering Control Module, which is crucial for the electric power steering system. If this code appears, it can lead to heavy steering, unresponsiveness, and even loss of steering control, making it essential to address immediately.

What are the most common causes of C0401 and how much does it cost to fix?

Common causes of C0401 include a faulty Power Steering Control Module, poor wiring connections, and software issues. Repair costs can range from $100 for wiring repairs to $600 for module replacement, depending on the severity of the problem.

Can I drive my car with C0401 or should I stop immediately?

Driving with a C0401 code is not advisable due to the potential for steering loss. If you notice any symptoms like heavy steering or unusual noises, it's best to have your vehicle inspected as soon as possible to ensure your safety.

How can I diagnose C0401 myself using GeekOBD APP?

To diagnose C0401 using the GeekOBD APP, start by scanning the OBD2 system to retrieve codes. Look for any related trouble codes, check freeze frame data for context, and inspect the wiring and connections to the Power Steering Control Module.

What vehicles are most commonly affected by C0401?

The C0401 code is frequently reported in 2015-2018 Chevy Silverado and GMC Sierra models, as well as other GM vehicles equipped with electric power steering systems. If you own one of these models, stay vigilant for steering issues.

How can I prevent C0401 from happening again?

Regular maintenance, including checking the power steering fluid levels and inspecting wiring for wear, can help prevent the recurrence of the C0401 code. Additionally, keeping your vehicle's software up to date can reduce the risk of electronic malfunctions.

What is C0401?

The DTC C0401 code indicates a malfunction related to the Power Steering Control Module (PSCM) in your vehicle. This code is commonly found in models like the 2015-2018 Chevy Silverado and GMC Sierra. When the C0401 code is triggered, it typically signifies that the PSCM is not communicating correctly with other modules in the vehicle, which can lead to steering issues. This can cause a range of problems, from steering that feels heavy or unresponsive to complete steering failure in severe cases. The PSCM plays a crucial role in managing the electric power steering system, and when it fails, it can affect vehicle safety and drivability. If you experience this code, it’s essential to address it promptly to avoid further complications or damage. Ignoring this code could lead to increased wear on other steering components and potentially put you and others at risk on the road. Understanding the implications of a C0401 code can help you take proactive measures to keep your vehicle safe and functional.

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

Symptoms

Common symptoms when C0401 is present:

  • The check engine light or power steering light may illuminate on the dashboard, indicating a problem with the steering system.
  • Drivers may notice a significant increase in steering effort, making the vehicle feel harder to steer, especially at lower speeds.
  • In some cases, the steering may feel unresponsive, causing difficulty in turning corners or maneuvering in tight spaces.
  • Drivers might experience occasional steering lock-up, where the steering wheel becomes difficult to turn momentarily.
  • There could be unusual noises coming from the steering column or power steering pump, indicating underlying issues.

Possible Causes

Most common causes of C0401 (ordered by frequency):

  1. The most common cause of the C0401 code is a faulty Power Steering Control Module, which can occur in approximately 60% of cases. This failure can result from electrical faults, moisture intrusion, or wear over time.
  2. A second cause could be poor wiring or connections to the PSCM, which can lead to communication issues. Corrosion or frayed wires can interrupt signals and trigger this fault code.
  3. Another cause includes software glitches within the PSCM. Regular updates are essential to prevent these issues, and manufacturers often release patches for these systems.
  4. Less frequently, a malfunction in the electric power steering system itself can trigger the C0401 code. This can be a more serious issue that may require extensive repairs.
  5. In rare cases, a complete power steering pump failure can also be indicated by this code, necessitating a replacement of the pump and associated components.

C0401 Repair Costs

Cost Breakdown by Repair Type

Replacing the Power Steering Control Module

This option involves replacing the faulty PSCM with a new or refurbished unit.

  • Total: $300 - $600
  • Success rate: 80%
Repairing Wiring Issues

This involves fixing or replacing damaged wiring and ensuring proper connections.

  • Total: $100 - $250
  • Success rate: 70%
Money-Saving Tips for C0401
  • 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 C0401 Diagnosis Process

Follow these systematic steps to accurately diagnose C0401. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Begin by checking the wiring to the Power Steering Control Module for visible damage, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Begin by checking the wiring to the Power Steering Control Module for visible damage, 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: Use the GeekOBD APP to perform an OBD2 scan - Retrieve all stored trouble codes and freeze frame data for context regarding the C0401 code (10-15 minutes)

Step 2: Use the GeekOBD APP to perform an OBD2 scan - Retrieve all stored trouble codes and freeze frame data for context regarding the C0401 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 Power Steering Control Module with a multimeter to measure voltage and continuity, ensuring it is functioning correctly (20-30 minutes)

Step 3: Test the Power Steering Control Module with a multimeter to measure voltage and continuity, ensuring it 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: Conduct a system function test - After making any necessary repairs, verify that the power steering system operates smoothly and clear any stored codes (10-15 minutes)

Step 4: Conduct a system function test - After making any necessary repairs, verify that the power steering system operates smoothly and clear any stored 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: Perform a road test to ensure that the steering feels normal under various conditions, confirming that the issue has been resolved (15-20 minutes)

Step 5: Perform a road test to ensure that the steering feels normal under various conditions, confirming that the issue has been resolved (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: Power Steering Control Module Replacement in 2016 Chevy Silverado

Vehicle: 2016 Chevy Silverado, 75,000 miles

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

Diagnosis: Using the GeekOBD APP, the C0401 code was retrieved. Further inspection showed a faulty Power Steering Control Module.

Solution: Replaced the Power Steering Control Module and reprogrammed the system.

Cost: $450 (including parts and labor)

Result: Steering returned to normal operation, and the customer reported satisfaction with the repair.

Case Study 2: Wiring Repair for C0401 in 2017 GMC Sierra

Vehicle: 2017 GMC Sierra, 60,000 miles

Problem: Customer experienced intermittent steering failure and C0401 code triggered.

Diagnosis: A visual inspection revealed corroded wiring at the PSCM connectors.

Solution: Cleaned connectors and replaced damaged wiring.

Cost: $150 (labor and materials included)

Result: After repairs, the steering functioned correctly, and no codes returned.

Diagnose C0401

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: C0401
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes