Quick Answer
C0746 means: C0746 indicates a traction control module performance issue.
Can I drive with C0746? Immediate attention is recommended to ensure safety and vehicle functionality.
Common Questions
What does C0746 mean and how does it affect my car?
The C0746 code indicates an issue with your vehicle's traction control system. This can significantly impact your ability to drive safely, especially in poor weather conditions. Ignoring this code may lead to further complications and could compromise your vehicle's performance and safety.
What are the most common causes of C0746 and how much does it cost to fix?
Common causes include a faulty traction control module, damaged wiring, or malfunctioning wheel speed sensors. Repair costs can vary widely, ranging from $100 for wiring repairs to $800 for module replacements, depending on the issue and vehicle model.
Can I drive my car with C0746 or should I stop immediately?
While it's possible to drive with a C0746 code, it's not advisable. The traction control system is critical for maintaining safety and stability, especially in adverse conditions. It's best to address this issue promptly to avoid potential accidents.
How can I diagnose C0746 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan your vehicle to retrieve the C0746 code and additional codes. The app allows you to view live data, which can help pinpoint the issue by monitoring wheel speed sensors and module performance.
What vehicles are most commonly affected by C0746?
C0746 is commonly seen in models such as the Chevrolet Silverado (2014-2018), GMC Sierra (2013-2017), and certain models of Ford and Dodge trucks. Always check for any recalls or Technical Service Bulletins (TSBs) related to your vehicle.
How can I prevent C0746 from happening again?
Regular maintenance, including inspections of wiring and connectors, can help prevent C0746. Ensure that your vehicle's software is up to date and perform periodic checks on wheel speed sensors to maintain traction control system functionality.
What is C0746?
The C0746 diagnostic trouble code indicates a problem with the traction control module's performance, particularly in vehicles such as the 2014-2018 Chevrolet Silverado and the 2013-2017 GMC Sierra. This code typically arises when the Engine Control Module (ECM) detects a malfunction in the traction control system, which is vital for maintaining stability and traction on slippery surfaces. When the traction control system fails, it can lead to compromised vehicle control, especially during adverse weather conditions. In essence, this code signifies that the traction control system is unable to operate as intended, which can result in decreased safety and increased wear on other components like tires. The implications of ignoring a C0746 code can be significant, potentially leading to more extensive repairs down the line, as well as safety hazards while driving. Therefore, it's crucial for vehicle owners to understand this code and take appropriate action to diagnose and resolve the issue promptly.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0746 is present:
- The check engine light is illuminated consistently, indicating an underlying issue with the traction control system.
- Drivers may notice that the vehicle struggles for traction during acceleration, particularly on wet or icy roads, leading to potential safety risks.
- An observable decrease in fuel economy, as the vehicle may engage the traction control system more frequently, causing the engine to work harder.
- There may be an unusual noise coming from the traction control system when engaging, indicating mechanical issues.
- The ABS (Anti-lock Braking System) warning light may also illuminate, highlighting possible interconnected issues within the braking and traction systems.
Possible Causes
Most common causes of C0746 (ordered by frequency):
- The most common cause of the C0746 code is a faulty traction control module, with a likelihood of around 60%. This can stem from electrical issues or internal component failures.
- Another frequent cause is damaged wiring or connectors leading to the traction control system, which can cause intermittent failures or complete system shutdown.
- Malfunctioning wheel speed sensors can also trigger the C0746 code. Regular inspections and cleanings can prevent sensor issues.
- Less common but serious issues include problems with the ABS control module, which may require more extensive repairs or replacements.
- In rare cases, software issues in the vehicle’s ECM may incorrectly flag the traction control module, leading to unnecessary repairs.
C0746 Repair Costs
Cost Breakdown by Repair Type
Traction Control Module Replacement
Replacing a faulty traction control module to restore proper function.
- Total: $300 - $800
- Success rate: 85%
Wheel Speed Sensor Repair
Repairing or replacing malfunctioning wheel speed sensors that affect traction control.
- Total: $150 - $300
- Success rate: 90%
Electrical Connector Replacement
Replacing damaged wiring or connectors related to the traction control system.
- Total: $100 - $250
- Success rate: 75%
Money-Saving Tips for C0746
- 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 C0746 Diagnosis Process
Follow these systematic steps to accurately diagnose C0746. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for damaged wiring, loose connections, or corrosion around the traction control module and associated components (5-10 minutes)
Step 1: Initial visual inspection - Check for damaged wiring, loose connections, or corrosion around the traction control module and associated components (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context, allowing for a clearer picture of the issue (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context, allowing for a clearer picture of the issue (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter or specialized diagnostic tools to assess the functionality of the traction control module and associated sensors (20-30 minutes)
Step 3: Component testing - Use a multimeter or specialized diagnostic tools to assess the functionality of the traction control module and associated sensors (20-30 minutes).
Step 4: Step 4: System function test - After repairs or replacements, verify the proper operation of the traction control system and clear the codes to see if they return (10-15 minutes)
Step 4: System function test - After repairs or replacements, verify the proper operation of the traction control system and clear the codes to see if they return (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to ensure that the traction control system is functioning correctly and that no warning lights reappear (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to ensure that the traction control system is functioning correctly and that no warning lights reappear (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: 2016 Chevrolet Silverado Traction Control Module Replacement
Vehicle: 2016 Chevrolet Silverado 1500, 75,000 miles
Problem: The customer reported that the traction control warning light was illuminated, and the vehicle experienced traction issues in rainy conditions.
Diagnosis: Using the GeekOBD APP, the technician retrieved the C0746 code, indicating a traction control module fault. A visual inspection revealed corroded wiring connections.
Solution: The technician replaced the traction control module and repaired the damaged wiring. After the replacement, the system was tested and confirmed operational.
Cost: $650 (parts: $400 for the module, $250 for labor)
Result: The traction control system functioned correctly, and the customer reported improved vehicle handling in adverse conditions.
Case Study 2: 2015 GMC Sierra Wheel Speed Sensor Repair
Vehicle: 2015 GMC Sierra 1500, 60,000 miles
Problem: The ABS and traction control warning lights were on, and the vehicle exhibited erratic braking behavior.
Diagnosis: The technician used the GeekOBD APP to retrieve the C0746 code and identified a faulty wheel speed sensor as the root cause.
Solution: The technician replaced the defective wheel speed sensor and cleared the error codes. The system was then tested for proper function.
Cost: $200 (parts: $100 for the sensor, $100 for labor)
Result: The ABS and traction control systems were restored to normal operation, eliminating the warning lights.