Quick Answer
C0668 means: C0668 indicates a problem with the traction control system's communication.
Can I drive with C0668? Immediate attention is recommended to ensure vehicle safety.
Common Questions
What does C0668 mean and how does it affect my car?
The C0668 code indicates a fault in the traction control system's communication. This can lead to impaired vehicle stability and control, especially in adverse weather conditions. It's crucial to address this issue promptly as it may affect other braking systems, leading to safety concerns.
What are the most common causes of C0668 and how much does it cost to fix?
Common causes include a faulty traction control module, wiring issues, and sensor malfunctions. Repair costs can range from $100 for wiring repairs to $800 for module replacement, depending on the specific issue.
Can I drive my car with C0668 or should I stop immediately?
It's not recommended to drive with the C0668 code as it indicates a malfunction in the traction control system, potentially compromising your vehicle's safety. If you notice any symptoms, such as the traction control light on, it's best to have the car inspected immediately.
How can I diagnose C0668 myself using GeekOBD APP?
Using the GeekOBD APP, you can perform an OBD2 scan to retrieve the C0668 code, examine freeze frame data for additional context, and check for any other related codes that may indicate underlying issues within the traction control system.
What vehicles are most commonly affected by C0668?
The C0668 code is most commonly found in 2013-2019 Chevrolet and GMC models, including the Silverado, Sierra, and Equinox. Owners of these vehicles should be particularly vigilant about traction control issues.
How can I prevent C0668 from happening again?
Regular vehicle maintenance, including inspections of the traction control components and sensor wiring, can help prevent the C0668 code from recurring. Keeping software updated and avoiding harsh driving conditions may also contribute to system longevity.
What is C0668?
The diagnostic trouble code (DTC) C0668 indicates a problem related to the traction control system, specifically signaling a fault in the GMLAN communication system between the traction control module and the vehicle's electronic control unit (ECU). This code is prevalent in various 2013-2019 Chevrolet and GMC models, including the Silverado, Sierra, and Equinox. When the traction control system encounters issues, it can lead to decreased vehicle stability and control, especially in slippery conditions. Drivers may notice the traction control warning light illuminated on the dashboard, indicating that the system is either disabled or malfunctioning. Ignoring this code can affect the vehicle's performance, leading to compromised safety during adverse driving conditions. It's crucial for owners experiencing this code to understand that it may also impact other systems, including the anti-lock braking system (ABS), which relies on similar signals to function correctly. Therefore, timely diagnostics and repairs are essential to restore the full capabilities of the vehicle's traction control system and ensure safe driving conditions.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0668 is present:
- The traction control warning light remains illuminated, signaling that the system is not functioning correctly and may impact vehicle stability.
- Drivers may experience reduced acceleration or hesitation during driving, indicating the vehicle's traction control system is not engaging as intended.
- Increased stopping distances can be observed, especially on wet or slippery roads, due to potential ABS malfunctions connected to this code.
- Unusual noises during braking or acceleration can occur, signaling potential component failures within the traction control system or related systems.
- A noticeable decrease in fuel efficiency may be evident, with some drivers reporting a drop of about 10-15%, as the traction control system struggles to manage power effectively.
Possible Causes
Most common causes of C0668 (ordered by frequency):
- {'cause': 'Faulty traction control module (40%)', 'details': 'The traction control module may have failed due to electrical issues or physical damage, leading to poor communication with the ECU.'}
- {'cause': 'Wiring issues (25%)', 'details': 'Corroded, damaged, or loose wiring connections can disrupt the signals needed for proper traction control function.'}
- {'cause': 'Sensor malfunctions (20%)', 'details': "Wheel speed sensors or accelerometers may be defective, affecting the traction control system's ability to gauge tire grip and control vehicle dynamics.", 'preventionTips': 'Regularly inspect and clean sensor connections to prevent corrosion and damage.'}
- {'cause': 'Software glitches (10%)', 'details': 'Outdated or corrupted software within the traction control system can lead to communication errors, necessitating a reprogramming or update.'}
- {'cause': 'Less common: ABS module failure (5%)', 'details': 'In rare cases, the ABS control module may fail, causing a cascade of issues that lead to the C0668 code.'}
C0668 Repair Costs
Cost Breakdown by Repair Type
Traction Control Module Replacement
Replacing the faulty traction control module to restore proper communication and functionality.
- Total: $300 - $800
- Success rate: 85%
Wiring Repair
Repairing or replacing damaged wiring and connectors to ensure proper signal transmission.
- Total: $100 - $300
- Success rate: 75%
Sensor Replacement
Replacing malfunctioning wheel speed sensors to restore accurate readings for the traction control system.
- Total: $150 - $400
- Success rate: 80%
Money-Saving Tips for C0668
- 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 C0668 Diagnosis Process
Follow these systematic steps to accurately diagnose C0668. 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).
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).
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, including the traction control module and sensors (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, including the traction control module and sensors (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes to ensure the issue is resolved (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes to ensure the issue is resolved (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm successful repairs and proper traction control operation (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm successful repairs and proper traction control operation (15-20 minutes).
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: Traction Control Module Replacement in a 2015 Chevrolet Silverado
Vehicle: 2015 Chevrolet Silverado 1500, 85,000 miles
Problem: The customer reported that the traction control light was on, and the vehicle experienced reduced stability during wet conditions.
Diagnosis: A thorough diagnostic indicated a failure in the traction control module, confirmed by communication errors during testing.
Solution: The faulty traction control module was replaced, and the wiring was inspected for damage.
Cost: $600 (module: $500, labor: $100)
Result: Post-repair, the traction control system functioned correctly, and the warning light was cleared.
Case Study 2: Wiring Repair in a 2018 GMC Sierra
Vehicle: 2018 GMC Sierra 1500, 50,000 miles
Problem: The customer experienced intermittent traction control failures and noticed the warning light sporadically illuminating.
Diagnosis: Inspection revealed corroded wiring connections affecting the traction control system's signals.
Solution: Corroded connections were repaired, and new connectors were installed to ensure reliable communication.
Cost: $150 (materials and labor)
Result: The traction control system returned to normal operation, with the warning light no longer activating.