C0377 - Steering Wheel Position Sensor Circuit Range/Performance Problem

Quick Answer

C0377 means: DTC C0377 indicates a malfunction in the Steering Wheel Position Sensor, affecting steering performance.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with C0377? Address immediately to ensure safe vehicle operation.

Common Questions

What does C0377 mean and how does it affect my car?

DTC C0377 indicates a malfunction in the Steering Wheel Position Sensor. This can cause erratic steering behavior and impact the performance of stability control systems. If not addressed, it can lead to safety issues while driving.

What are the most common causes of C0377 and how much does it cost to fix?

Common causes of C0377 include a faulty steering wheel position sensor (60% likelihood), wiring issues (25%), and incorrect calibration. Repair costs typically range from $100 to $300 depending on the specific issue.

Can I drive my car with C0377 or should I stop immediately?

It is advisable to stop driving your vehicle if this code is present, as it can lead to compromised steering control and safety risks.

How can I diagnose C0377 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform a diagnostic scan of your vehicle, retrieve the C0377 code, and view freeze frame data to understand the conditions under which the fault occurred. This helps in troubleshooting the issue effectively.

What vehicles are most commonly affected by C0377?

DTC C0377 is frequently reported in the 2014-2018 Chevrolet Silverado and 2015-2018 GMC Sierra models, among others. It's advisable to check for any recalls or technical service bulletins (TSBs) related to steering issues in these vehicles.

How can I prevent C0377 from happening again?

Regular maintenance, including inspecting wiring and connectors for wear, and ensuring proper calibration of the steering system during repairs can help prevent the C0377 code from reoccurring.

What is C0377?

The diagnostic trouble code (DTC) C0377 indicates a problem with the Steering Wheel Position Sensor. This sensor is crucial for determining the angle and position of the steering wheel, which informs various systems in your vehicle, including stability control and adaptive cruise control. When this code appears, it typically means that the sensor is providing readings that are outside the expected range or that there is a performance issue with the sensor itself. This could be due to a variety of factors such as wiring issues, a faulty sensor, or problems in the electronic control unit (ECU). Real-world implications of this code can vary widely. For instance, drivers may experience erratic steering behavior, warning lights on the dashboard, or even a loss of power steering assist in severe cases. If ignored, this issue can not only compromise driving safety but can also lead to more extensive repairs if the underlying problem worsens. It's crucial to address this code promptly, especially for vehicles like the 2014-2018 Chevrolet Silverado or the 2015-2018 GMC Sierra, where steering performance is paramount for safety and control.

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

Symptoms

Common symptoms when C0377 is present:

  • The check engine light illuminates continuously, indicating a potential issue with the steering system.
  • The vehicle may experience steering wheel stiffness or a lack of responsiveness during turns, making driving feel unsafe.
  • Drivers might notice a decrease in fuel efficiency, as the vehicle's electronic systems struggle to adapt to incorrect steering data.
  • The stability control light may activate, signaling that the vehicle's traction systems are not functioning optimally.
  • In some cases, a warning message may appear on the dashboard, specifically indicating that there is a problem with the steering system.

Possible Causes

Most common causes of C0377 (ordered by frequency):

  1. The most common cause of DTC C0377 is a faulty steering wheel position sensor, which occurs in about 60% of cases. This sensor can wear out over time or fail due to exposure to moisture and dirt.
  2. A wiring issue such as damaged wires or corroded connectors is another frequent cause, occurring in roughly 25% of cases. This can disrupt the signals sent from the sensor to the ECU.
  3. Incorrect calibration of the steering wheel position sensor can also trigger this code, especially after vehicle repairs or replacements in the steering system. Regular maintenance and recalibration are recommended to prevent this.
  4. Less common but serious causes include a malfunctioning electronic control unit (ECU), which may misinterpret the sensor's signals. This can lead to a complete loss of steering assistance if not addressed.
  5. In rare instances, software glitches in the vehicle's onboard systems can lead to a false reading, causing the C0377 code to activate without any physical faults.

C0377 Repair Costs

Cost Breakdown by Repair Type

Steering Wheel Position Sensor Replacement

Replacing the faulty steering wheel position sensor with a new unit to restore proper function.

  • Total: $150 - $300
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring or connectors associated with the steering system.

  • Total: $100 - $200
  • Success rate: 85%
Money-Saving Tips for C0377
  • 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 C0377 Diagnosis Process

Follow these systematic steps to accurately diagnose C0377. 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 wheel position sensor against manufacturer specifications (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the steering wheel position sensor against manufacturer specifications (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 the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the 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 check for any reoccurring codes (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and check for any reoccurring codes (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 Wheel Sensor Replacement for 2017 Chevrolet Silverado

Vehicle: 2017 Chevrolet Silverado 1500, 45,000 miles

Problem: Customer reported a persistent check engine light and difficulty steering.

Diagnosis: Diagnostic scan revealed DTC C0377. A visual inspection indicated a damaged steering wheel position sensor.

Solution: Replaced the steering wheel position sensor with an OEM part.

Cost: $250 (parts: $150; labor: $100)

Result: After the repair, the check engine light cleared, and steering responsiveness improved significantly.

Case Study 2: Wiring Repair on 2015 GMC Sierra

Vehicle: 2015 GMC Sierra 1500, 60,000 miles

Problem: Owner experienced erratic steering and dashboard warning lights.

Diagnosis: OBD2 scan confirmed C0377. Inspection revealed frayed wiring near the steering column.

Solution: Repaired the damaged wiring harness and secured all connections.

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

Result: Post-repair road tests showed normal steering function, and the warning lights remained off.

Diagnose C0377

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: C0377
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes