C0804 - Traction Control System Malfunction in Common Vehicles Like Chevrolet and GMC

Quick Answer

C0804 means: C0804 indicates a traction control system malfunction, affecting vehicle stability.

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

Can I drive with C0804? Immediate attention is recommended to ensure safety and performance.

Common Questions

What does C0804 mean and how does it affect my car?

C0804 indicates a malfunction in your vehicle's traction control system, which helps maintain stability and control during slippery conditions. Ignoring this code can lead to decreased safety and handling performance.

What are the most common causes of C0804 and how much does it cost to fix?

Common causes include faulty wheel speed sensors or damaged wiring, with repair costs ranging from $100 to $600 depending on the issue. It's crucial to diagnose the exact problem for accurate repair estimates.

Can I drive my car with C0804 or should I stop immediately?

While you may be able to drive with C0804, it's not advisable due to potential handling issues. It's best to schedule a diagnostic as soon as possible to ensure your safety.

How can I diagnose C0804 myself using GeekOBD APP?

Using the GeekOBD APP, you can easily scan for DTC codes, view freeze frame data, and monitor live data from your vehicle's sensors. This information can help you pinpoint the issue before taking it to a mechanic.

What vehicles are most commonly affected by C0804?

Commonly affected vehicles include 2010-2015 Chevrolet Equinox and 2011-2016 GMC Terrain. Always check for any related recalls or service bulletins that might address this issue.

How can I prevent C0804 from happening again?

Regular maintenance of your vehicle's braking and traction systems, along with periodic checks of sensors and wiring, can help prevent the recurrence of the C0804 code. Keeping your vehicle clean and dry can also reduce corrosion risks.

What is C0804?

The diagnostic trouble code (DTC) C0804 indicates a malfunction within the traction control system (TCS) of your vehicle. This code is commonly found in models such as the 2010-2015 Chevrolet Equinox and the 2011-2016 GMC Terrain. The traction control system is designed to enhance vehicle stability and control, especially in slippery conditions, by preventing wheel spin during acceleration. When the TCS detects an issue, it triggers the C0804 code, which can manifest as a warning light on the dashboard. This might not only affect your vehicle's handling but also influence its safety features, including anti-lock brakes (ABS). If left unaddressed, a malfunctioning TCS can lead to further complications, such as reduced fuel efficiency or even increased wear on drivetrain components. It's crucial to get this code diagnosed and repaired promptly to maintain your vehicle’s performance and safety. Regular maintenance, including checking TCS-related sensors and wiring, can help prevent this issue from recurring. Understanding the significance of the C0804 code allows car owners to take informed action, ensuring their vehicle remains safe and reliable on the road.

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

Symptoms

Common symptoms when C0804 is present:

  • The traction control warning light remains illuminated, indicating a persistent issue with the system.
  • Drivers may experience reduced acceleration and handling, especially during wet or slippery conditions, making the vehicle feel unstable.
  • You might notice a decrease in fuel efficiency, with reports of up to a 15% drop, as the system struggles to manage wheel spin.
  • Unusual noises or vibrations may occur when the traction control system attempts to engage.
  • The vehicle may fail to respond normally when accelerating, such as hesitating or stalling.

Possible Causes

Most common causes of C0804 (ordered by frequency):

  1. The most common cause of the C0804 code is a faulty wheel speed sensor, which makes up about 40% of cases. This sensor monitors wheel rotation and sends data to the TCS. If it fails, the system cannot function correctly.
  2. Another frequent issue is damaged wiring or poor connections, contributing to around 30% of cases. Corrosion or fraying can disrupt the electrical signals necessary for the TCS to operate.
  3. A malfunctioning TCS control module itself may cause the error, accounting for about 20% of occurrences. This can result from software glitches or component failure.
  4. Less commonly, issues with the ABS could trigger the C0804 code, especially if the ABS light is also on. This could point to a serious underlying issue requiring immediate attention.
  5. In rare instances, a low battery voltage or other electrical system issues can cause false readings, leading to the C0804 code being set.

C0804 Repair Costs

Cost Breakdown by Repair Type

Wheel Speed Sensor Replacement

Replacing a faulty wheel speed sensor is often the first line of repair for C0804.

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

Repairing damaged wiring or connections can resolve issues related to C0804.

  • Total: $100 - $250
  • Success rate: 75%
TCS Control Module Replacement

If the control module is found to be defective, replacing it can rectify the issue.

  • Total: $300 - $600
  • Success rate: 90%
Money-Saving Tips for C0804
  • 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 C0804 Diagnosis Process

Follow these systematic steps to accurately diagnose C0804. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Look for obvious signs like damaged wiring, loose connections, or corrosion, which usually takes about 5-10 minutes

Step 1: Initial visual inspection - Look for obvious signs like damaged wiring, loose connections, or corrosion, which usually takes 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: OBD2 scan with GeekOBD APP - Use the app to retrieve all codes and freeze frame data, helping to understand the fault context

Step 2: OBD2 scan with GeekOBD APP - Use the app to retrieve all codes and freeze frame data, helping to understand the fault context. This process 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 3: Step 3: Component testing - Utilize a multimeter or specialized diagnostic tools to test suspected components, allowing for more in-depth analysis over 20-30 minutes

Step 3: Component testing - Utilize a multimeter or specialized diagnostic tools to test suspected components, allowing for more in-depth analysis over 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 - After repairs, verify proper operation of the TCS and clear codes to ensure the issue is resolved, which typically takes 10-15 minutes

Step 4: System function test - After repairs, verify proper operation of the TCS and clear codes to ensure the issue is resolved, which typically takes 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 ensure that the TCS functions correctly

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure that the TCS functions correctly. This step usually takes about 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: Chevrolet Equinox C0804 Repair Success

Vehicle: 2012 Chevrolet Equinox, 85,000 miles

Problem: Customer reported traction control warning light and reduced vehicle stability.

Diagnosis: Diagnostic scan revealed C0804 code. Visual inspection found a damaged wheel speed sensor.

Solution: Replaced the faulty wheel speed sensor, recalibrated the system, and cleared the codes.

Cost: $220 (sensor cost $120, labor $100)

Result: Post-repair road test confirmed successful resolution of the issue, with no warning lights present.

Case Study 2: GMC Terrain Traction Control Issue

Vehicle: 2014 GMC Terrain, 70,000 miles

Problem: Driver experienced handling issues and noticed the TCS warning light was on.

Diagnosis: Found C0804 code during the scan. Further testing indicated damaged wiring leading to the TCS control module.

Solution: Repaired the damaged wiring and tested the system for functionality.

Cost: $180 (wiring repair cost $80, labor $100)

Result: Resolved the issue effectively, and the customer reported improved vehicle handling.

Diagnose C0804

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
Download GeekOBD APP Get MOBD Adapter

Code Information

Code: C0804
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes