C0647 - Understanding DTC C0647: Common Issues in 2015-2020 Chevrolet Equinox and GMC Terrain

Quick Answer

C0647 means: C0647 indicates a malfunction in the Steering Angle Sensor, affecting vehicle stability.

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

Can I drive with C0647? Immediate attention is recommended to ensure safe vehicle operation.

Common Questions

What does C0647 mean and how does it affect my car?

C0647 signifies a malfunction in your vehicle's Steering Angle Sensor. This sensor plays a key role in the stability control system, helping ensure safe handling and traction. A faulty sensor can lead to difficulties in steering and compromised safety, affecting your vehicle's performance both in normal and emergency driving situations.

What are the most common causes of C0647 and how much does it cost to fix?

The primary cause of C0647 is often a faulty Steering Angle Sensor, which typically costs between $150 to $300 to replace. Other causes include wiring issues and calibration errors, which may also incur similar costs. It's best to consult with a professional mechanic for an accurate diagnosis and repair estimate.

Can I drive my car with C0647 or should I stop immediately?

Driving with a C0647 code is not advisable, as it can compromise your vehicle's handling and stability, leading to unsafe driving conditions. Immediate attention is recommended to prevent potential accidents or further damage to the vehicle.

How can I diagnose C0647 myself using GeekOBD APP?

To diagnose C0647 with the GeekOBD APP, connect the device to your vehicle's OBD2 port, run a scan to retrieve diagnostic codes, and carefully analyze the freeze frame data. Pay attention to the specific parameters that indicate steering angle, and check for any related codes that may help narrow down the issue.

What vehicles are most commonly affected by C0647?

C0647 is frequently observed in vehicles like the 2015-2020 Chevrolet Equinox and GMC Terrain. These models have reported issues related to the Steering Angle Sensor, and it's advisable to check for any recalls or Technical Service Bulletins (TSBs) related to this code.

How can I prevent C0647 from happening again?

To prevent C0647, ensure regular vehicle maintenance, including inspections of the steering system and electrical connections. Additionally, avoiding harsh driving conditions that may stress the steering components can help maintain sensor integrity.

What is C0647?

DTC C0647 indicates a problem with the Steering Angle Sensor (SAS) in your vehicle's stability control system. This diagnostic trouble code is commonly seen in vehicles like the 2015-2020 Chevrolet Equinox and GMC Terrain. The SAS is crucial for the vehicle's stability control system, helping to determine the angle at which the steering wheel is turned. When this sensor is malfunctioning, it can lead to erratic handling, compromised traction control, and potentially unsafe driving conditions. The error code may arise from a variety of issues, including wiring problems, sensor failure, or calibration errors. If left unaddressed, a faulty SAS can severely impact vehicle performance and lead to higher repair costs down the line. Additionally, the check engine light will likely illuminate as a warning, signaling the need for immediate attention. Addressing this issue early can prevent further complications, ensuring safer driving and maintaining vehicle integrity.

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

Symptoms

Common symptoms when C0647 is present:

  • The Check Engine Light is illuminated, indicating a need for immediate diagnostic attention.
  • You may experience unexpected steering behavior, such as the steering wheel feeling loose or unresponsive, affecting your driving confidence.
  • There could be a noticeable decrease in traction control effectiveness, especially during wet or icy conditions, leading to potential safety issues.
  • The stability control system might engage unexpectedly, causing the vehicle to behave unpredictably during turns or emergency maneuvers.
  • You may notice an increase in tire wear due to improper alignment resulting from the sensor malfunction.

Possible Causes

Most common causes of C0647 (ordered by frequency):

  1. The most common cause is a faulty Steering Angle Sensor, which has about a 60% likelihood of being the root issue. This sensor may fail due to wear and tear or exposure to moisture.
  2. Wiring issues, including frayed or corroded wires, can account for about 25% of cases. These problems can disrupt the electrical signals needed for proper sensor operation.
  3. Calibration errors following steering component replacements can lead to C0647. This is a common oversight during repairs, and proper recalibration is necessary to ensure accuracy.
  4. Less common but serious causes include issues with the Electronic Stability Control module, which can impact multiple systems within the vehicle.
  5. Rare instances may involve software glitches within the vehicle's onboard computer system, requiring updates or resets to resolve.

C0647 Repair Costs

Cost Breakdown by Repair Type

Steering Angle Sensor Replacement

Replacing the faulty Steering Angle Sensor with a new one.

  • Total: $150 - $300
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring or connectors.

  • Total: $100 - $200
  • Success rate: 75%
Money-Saving Tips for C0647
  • 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 C0647 Diagnosis Process

Follow these systematic steps to accurately diagnose C0647. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Conduct an initial visual inspection to check for damaged wiring, loose connections, or corrosion, which should take about 5-10 minutes

Step 1: Conduct an initial visual inspection to check for damaged wiring, loose connections, or corrosion, which should take about 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, retrieving all codes and freeze frame data to understand the context of the fault

Step 2: Use the GeekOBD APP to perform an OBD2 scan, retrieving all codes and freeze frame data to understand the context of the fault. This step may take 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: Conduct component testing using a multimeter or specific diagnostic tools to test the Steering Angle Sensor and wiring harness for continuity, which could take 20-30 minutes

Step 3: Conduct component testing using a multimeter or specific diagnostic tools to test the Steering Angle Sensor and wiring harness for continuity, which could take 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: Verify system function after repairs by conducting a function test and clearing codes

Step 4: Verify system function after repairs by conducting a function test and clearing codes. This should take approximately 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 under various driving conditions to confirm repair success, lasting around 15-20 minutes

Step 5: Perform a road test under various driving conditions to confirm repair success, lasting around 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 on a 2018 Chevrolet Equinox

Vehicle: 2018 Chevrolet Equinox, 45,000 miles

Problem: The customer reported the Check Engine Light was on and experienced unusual steering behavior.

Diagnosis: After scanning the vehicle with GeekOBD, DTC C0647 was retrieved. A visual inspection revealed corrosion in the wiring harness.

Solution: Replaced the Steering Angle Sensor and repaired the damaged wiring. Conducted a system function test and cleared the codes.

Cost: $250 (sensor: $180, labor: $70)

Result: Post-repair, the Check Engine Light remained off, and the customer reported improved steering responsiveness.

Case Study 2: Wiring Repair on a 2019 GMC Terrain

Vehicle: 2019 GMC Terrain, 30,000 miles

Problem: The vehicle had a persistent C0647 code with no apparent symptoms initially.

Diagnosis: A thorough diagnostic revealed damaged wiring leading to the Steering Angle Sensor.

Solution: Repaired the wiring and recalibrated the Steering Angle Sensor using specialized diagnostic tools.

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

Result: The repair resolved the C0647 code, and the vehicle operated normally afterward.

Diagnose C0647

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: C0647
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes