C077C - Understanding the Code in 2015-2020 Chevrolet and GMC Vehicles

Quick Answer

C077C means: DTC C077C pertains to a malfunction in the steering angle sensor, affecting vehicle stability.

Fix: Check and replace faulty components Cost: $150 - $400 Time: 90-180 minutes

Can I drive with C077C? Immediate attention is recommended to prevent handling issues.

Common Questions

What does C077C mean and how does it affect my car?

The C077C code indicates a problem with your vehicle's steering angle sensor, which can lead to handling issues. If this sensor fails, it can affect your vehicle's stability control system, making it harder to control the car, especially in slippery conditions.

What are the most common causes of C077C and how much does it cost to fix?

Common causes of C077C include a defective steering angle sensor, loose wiring connections, or misalignment in the steering system. Repair costs can range from $150 for sensor replacement to over $1,200 for electronic control module replacement.

Can I drive my car with C077C or should I stop immediately?

While it's possible to drive with this code, it is not advisable. The compromised steering system can lead to safety hazards. It's best to address the issue as soon as possible to avoid potential accidents.

How can I diagnose C077C myself using GeekOBD APP?

To diagnose C077C using the GeekOBD APP, start by connecting the app to your vehicle's OBD2 port. Run a full system scan to retrieve all codes and freeze frame data. Check for any related codes and monitor the live data to see the steering angle readings.

What vehicles are most commonly affected by C077C?

C077C is most commonly seen in 2015-2020 Chevrolet and GMC models like the Silverado, Sierra, and Equinox. Always check for known recalls or technical service bulletins (TSBs) related to the steering system.

How can I prevent C077C from happening again?

To prevent future occurrences of C077C, regularly inspect your vehicle's steering components, keep the wiring harness protected from moisture, and perform routine alignments. Address any steering issues immediately to avoid further complications.

What is C077C?

The diagnostic trouble code (DTC) C077C indicates an issue with the steering angle sensor in vehicles, particularly affecting models from Chevrolet and GMC manufactured between 2015 and 2020. This sensor plays a crucial role in the vehicle's stability control system by detecting the position of the steering wheel. When the code C077C is triggered, it usually means that the sensor's signal is either faulty or inconsistent, which can lead to issues with the vehicle's handling and stability. In practical terms, this can manifest as unexpected changes in steering response, making the car feel unstable or unresponsive, especially during turns or in adverse weather. If left unresolved, this issue could compromise the vehicle's safety systems, increasing the risk of accidents. It's important for drivers experiencing this code to address it promptly to ensure their vehicle operates safely and effectively. Routine checks of the steering system, including the sensor, are recommended as part of regular vehicle maintenance. If you own a Chevrolet or GMC model during these years, being aware of DTC C077C is essential for maintaining your vehicle's performance and safety.

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

Symptoms

Common symptoms when C077C is present:

  • The check engine light or stability control warning light may illuminate, indicating a fault with the steering system.
  • Drivers may notice that the steering feels off, with delayed or unresponsive feedback, especially during turns.
  • Fuel efficiency could decrease as the vehicle's stability control system tries to compensate for the faulty sensor.
  • Unusual noises may come from the steering column area when turning, suggesting mechanical failures.
  • In some cases, the vehicle may enter limp mode, reducing power and speed to prevent further damage.

Possible Causes

Most common causes of C077C (ordered by frequency):

  1. The most common cause of DTC C077C is a malfunctioning steering angle sensor, which has a likelihood of about 60%. This can be due to wear and tear, exposure to moisture, or electrical issues.
  2. A loose or damaged wiring harness connected to the steering angle sensor is the second most common cause, occurring in approximately 25% of cases. This may result from physical damage or corrosion.
  3. Misalignment of the steering system can also trigger this code, with a 10% likelihood. Regular alignment checks can help prevent this issue.
  4. Less common but serious causes include malfunctioning electronic control modules, which may require costly replacements.
  5. A rare cause could be issues within the power steering pump or system, which can be complex and expensive to diagnose and repair.

C077C Repair Costs

Cost Breakdown by Repair Type

Steering Angle Sensor Replacement

Replacing the faulty steering angle sensor, including labor costs.

  • Total: $150 - $400
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring harness or connectors related to the steering angle sensor.

  • Total: $100 - $250
  • Success rate: 85%
Electronic Control Module Replacement

Replacing the electronic control module if it is determined to be faulty.

  • Total: $500 - $1,200
  • Success rate: 75%
Money-Saving Tips for C077C
  • 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 C077C Diagnosis Process

Follow these systematic steps to accurately diagnose C077C. 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 the steering angle sensor and its wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the steering angle sensor and its wiring (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 of the steering system after repairs and clear codes (10-15 minutes)

Step 4: System function test - Verify 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 that the repair was successful (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the repair was successful (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 Angle Sensor Replacement in a 2018 Chevy Silverado

Vehicle: 2018 Chevrolet Silverado, 45,000 miles

Problem: Customer reported instability in steering and check engine light on.

Diagnosis: Using the GeekOBD APP, the C077C code was retrieved along with live data showing the steering angle sensor was not functioning correctly.

Solution: Replaced the steering angle sensor and cleared the codes.

Cost: $250 (including parts and labor)

Result: Post-repair road test confirmed normal steering response and no warning lights.

Case Study 2: Wiring Harness Repair on a 2016 GMC Sierra

Vehicle: 2016 GMC Sierra, 60,000 miles

Problem: Driver experienced sporadic steering issues and C077C code was triggered.

Diagnosis: Visual inspection revealed damaged wiring near the steering column.

Solution: Repaired the wiring harness and retested the system.

Cost: $180 (including parts and labor)

Result: Steering function restored and no further codes appeared.

Diagnose C077C

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: C077C
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes