C0798 - Understanding the Traction Control Module Communication Failure in 2015-2019 Chevrolet Silverado

Quick Answer

C0798 means: DTC C0798 signifies a communication failure between the traction control module and the ECU.

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

Can I drive with C0798? Immediate attention is required to ensure vehicle safety and performance.

Common Questions

What does C0798 mean and how does it affect my car?

DTC C0798 indicates a communication failure between your vehicle's traction control module and the onboard computer. This can affect your vehicle's stability and handling, especially in slippery conditions. It’s important to address this issue to ensure your vehicle operates safely and efficiently.

What are the most common causes of C0798 and how much does it cost to fix?

Common causes include damaged wiring (60% likelihood), a faulty traction control module (25%), and poor maintenance practices. Repair costs can range from $150 for wiring repairs to $1,200 for module replacement, depending on the severity and specific repairs needed.

Can I drive my car with C0798 or should I stop immediately?

It's advisable to stop driving your car if the C0798 code appears, especially if you notice handling issues. Continuing to drive can compromise your vehicle's stability, potentially leading to dangerous situations.

How can I diagnose C0798 myself using GeekOBD APP?

To diagnose C0798 using the GeekOBD APP, start by connecting your device to the OBD2 port. Use the app to scan for codes, and refer to the freeze frame data to analyze the conditions under which the error occurred. Look for related codes that might help identify the issue.

What vehicles are most commonly affected by C0798?

DTC C0798 is frequently found in 2015-2019 Chevrolet Silverado models, as well as other General Motors vehicles like the GMC Sierra and Cadillac Escalade. Always check for any recalls or technical service bulletins related to your specific model.

How can I prevent C0798 from happening again?

Regular vehicle maintenance is key to preventing C0798. Ensure that all wiring connections are inspected periodically, and keep the TCM software updated. Address any warning lights or symptoms immediately to avoid further complications.

What is C0798?

DTC C0798 indicates a communication failure between the traction control module (TCM) and the vehicle's onboard computer system. This code is commonly seen in 2015-2019 Chevrolet Silverado models, but it can also occur in other General Motors vehicles that utilize similar TCM systems. When this code appears, it signifies that the TCM is unable to communicate properly with the vehicle's electronic control unit (ECU), which can lead to various performance issues. In practical terms, this may manifest as the traction control light illuminating on the dashboard, and you may notice a decline in traction control functionality. The TCM plays a crucial role in ensuring vehicle stability, especially in slippery conditions. If you experience DTC C0798, it's essential to address it promptly, as ignoring it could result in compromised vehicle handling and increased risk of losing control, particularly in adverse weather conditions. Additionally, unresolved communication issues can lead to further diagnostics and repair complications down the line, so early intervention is advisable to maintain safety and performance.

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

Symptoms

Common symptoms when C0798 is present:

  • The traction control warning light stays illuminated on the dashboard, indicating a malfunction.
  • Drivers may experience reduced traction control performance, particularly during acceleration on slippery roads.
  • Inconsistent handling or stability, especially when making sharp turns or during sudden stops, can be felt.
  • The vehicle might exhibit erratic behavior, such as unresponsive throttle or unexpected braking when traction is needed.
  • In some cases, the vehicle may enter 'limp mode', restricting power to prevent further damage.

Possible Causes

Most common causes of C0798 (ordered by frequency):

  1. The most common cause is damaged wiring or connectors between the TCM and ECU, with a likelihood of around 60%. Regular wear and tear can lead to these issues over time.
  2. Another frequent cause is a faulty traction control module itself, accounting for approximately 25% of cases. This can happen due to internal component failure or software glitches.
  3. Poor vehicle maintenance, such as neglecting routine checks and updates, can lead to sensor failures that trigger C0798, so keeping up with maintenance is crucial.
  4. Less common but serious causes include a failing ECU that affects overall vehicle communication, which can lead to widespread system failures.
  5. A rare cause could be a complete power loss to the TCM due to a blown fuse or a severe electrical issue, which needs immediate troubleshooting.

C0798 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repairing or replacing damaged wiring and connectors between the TCM and ECU.

  • Total: $150 - $400
  • Success rate: 85%
TCM Replacement

Replacing a faulty traction control module with a new or refurbished unit.

  • Total: $500 - $1,200
  • Success rate: 90%
ECU Reprogramming

Reprogramming the ECU to restore communication with the TCM.

  • Total: $100 - $300
  • Success rate: 75%
Money-Saving Tips for C0798
  • 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 C0798 Diagnosis Process

Follow these systematic steps to accurately diagnose C0798. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for signs of damaged wiring, loose connections, or corrosion in the TCM and ECU areas (5-10 minutes)

Step 1: Initial visual inspection - Check for signs of damaged wiring, loose connections, or corrosion in the TCM and ECU areas (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, which helps in pinpointing the issue (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context, which helps in pinpointing the issue (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 TCM and wiring harness for continuity and proper voltage (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the TCM and wiring harness for continuity and proper voltage (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 TCM and ECU, then clear codes and monitor for reoccurrence (10-15 minutes)

Step 4: System function test - After repairs, verify proper operation of the TCM and ECU, then clear codes and monitor for reoccurrence (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 the successful resolution of the issue (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm the successful resolution of the issue (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: Traction Control Module Replacement in a 2017 Chevrolet Silverado

Vehicle: 2017 Chevrolet Silverado, 45,000 miles

Problem: Customer reported the traction control light was on, and the vehicle experienced reduced traction on wet roads.

Diagnosis: Initial OBD2 scan revealed DTC C0798. Visual inspection showed damaged wiring harness to the TCM.

Solution: Replaced damaged wiring and installed a new traction control module.

Cost: $800 (parts: $500 for the module, $300 for labor)

Result: Post-repair, the traction control system functioned correctly, and the warning light was cleared.

Case Study 2: Wiring Repair for C0798 in a 2016 GMC Sierra

Vehicle: 2016 GMC Sierra, 50,000 miles

Problem: Customer experienced intermittent traction control issues and dashboard warning lights.

Diagnosis: DTC C0798 confirmed; inspection revealed corrosion at connector points.

Solution: Cleaned connectors, repaired wiring, and reprogrammed the ECU.

Cost: $250 (parts: $50 for connectors, $200 for labor)

Result: The traction control system returned to normal operation, and the customer reported no further issues.

Diagnose C0798

Use GeekOBD APP for professional diagnosis!

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Code Information

Code: C0798
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes