Quick Answer

C0C79 means: C0C79 indicates a communication error in the vehicle's network, primarily affecting the BCM.

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

Can I drive with C0C79? Immediate attention is recommended to avoid further vehicle issues.

Common Questions

What does C0C79 mean and how does it affect my car?

C0C79 points to a communication fault within your vehicle's systems, primarily affecting the body control module. This can lead to various electronic components malfunctioning, such as power windows or door locks, and may impact critical safety features like airbags. Addressing this issue promptly is vital to maintain vehicle safety and functionality.

What are the most common causes of C0C79 and how much does it cost to fix?

Common causes include damaged wiring, malfunctioning BCM, and corrosion in electrical connections. Repair costs can range from $150 for wiring repairs to $800 for BCM replacement, depending on the severity of the issue and labor involved.

Can I drive my car with C0C79 or should I stop immediately?

It is advisable to stop driving your vehicle once you see the C0C79 code. Ignoring it can lead to more severe problems, especially if safety systems are compromised.

How can I diagnose C0C79 myself using GeekOBD APP?

Using the GeekOBD APP, connect it to your vehicle's OBD-II port. Select 'Scan' to retrieve the DTCs and review the freeze frame data. This will help you understand the context of the C0C79 error and guide you in troubleshooting the issue.

What vehicles are most commonly affected by C0C79?

C0C79 is frequently reported in models like the 2016-2020 Ford F-Series, including the F-150 and F-250. Owners of these vehicles should be vigilant for related symptoms.

How can I prevent C0C79 from happening again?

Regular maintenance and inspections of the vehicle's wiring and connectors can help prevent C0C79. Additionally, keeping the electrical system clean and free from corrosion will mitigate potential issues.

What is C0C79?

The diagnostic trouble code (DTC) C0C79 is associated with a fault in the vehicle's communication network, particularly within the body control module (BCM) or the gateway module. This code often signifies that there has been a loss of communication between critical modules such as the ABS, airbag, and engine control unit. Car owners might notice various symptoms such as warning lights on the dashboard, including the check engine light, and potentially encountering issues with vehicle functions like the windows, door locks, or even climate control systems. The BCM is essential for managing various electronic functions in modern vehicles, and a fault in this area can lead to inconsistent operation of these systems. If you encounter C0C79, it is crucial to address it promptly as it may lead to further complications, including failure of safety systems like airbags and anti-lock brakes. Ignoring this code may not only affect vehicle performance but also increase repair costs in the long run.

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

Symptoms

Common symptoms when C0C79 is present:

  • The check engine light may illuminate, indicating a fault in the vehicle's communication network.
  • You might experience erratic behavior with electronic components such as windows or door locks failing to operate correctly.
  • There can be a noticeable drop in fuel efficiency, sometimes up to 15%, due to improper engine management.
  • Inconsistent operation of safety features like the anti-lock braking system (ABS) could occur, which is critical for safe driving.
  • Dashboard warning lights related to various systems may activate, indicating multiple issues needing urgent attention.

Possible Causes

Most common causes of C0C79 (ordered by frequency):

  1. The most common cause of the C0C79 code is damaged wiring or loose connectors, which accounts for about 60% of cases. These issues can arise from vehicle wear and tear or environmental factors.
  2. A malfunctioning BCM or gateway module can lead to communication errors, often due to software glitches or hardware failures, making up around 25% of cases.
  3. Corrosion at connection points or within wiring harnesses can prevent proper communication, and it’s advisable to regularly inspect these areas to prevent issues.
  4. Less common but serious causes include a short circuit in the electrical system, which can lead to extensive damage and is critical to address immediately.
  5. In rare cases, factory recalls related to the vehicle’s electrical systems might contribute to this code, particularly in specific models like the 2018 Ford F-150.

C0C79 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repair or replacement of damaged wiring and connectors associated with the BCM.

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

Replacement of the body control module if it is found to be faulty.

  • Total: $300 - $800
  • Success rate: 90%
Money-Saving Tips for C0C79
  • 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 C0C79 Diagnosis Process

Follow these systematic steps to accurately diagnose C0C79. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Conduct an initial visual inspection of all wiring and connectors related to the BCM to spot any obvious damage or corrosion (5-10 minutes)

Step 1: Conduct an initial visual inspection of all wiring and connectors related to the BCM to spot any obvious damage or corrosion (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 a diagnostic scanner or the GeekOBD APP to retrieve all stored codes and freeze frame data, which will provide context for the C0C79 code (10-15 minutes)

Step 2: Use a diagnostic scanner or the GeekOBD APP to retrieve all stored codes and freeze frame data, which will provide context for the C0C79 code (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: Perform component testing on the BCM and related modules using a multimeter to check for proper voltage and ground signals (20-30 minutes)

Step 3: Perform component testing on the BCM and related modules using a multimeter to check for proper voltage and ground signals (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: After any repairs, perform a system function test to ensure all components operate correctly and clear any codes from the memory (10-15 minutes)

Step 4: After any repairs, perform a system function test to ensure all components operate correctly and clear any codes from the memory (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: Conduct a road test under different driving conditions to verify the effectiveness of the repairs and ensure no codes reappear (15-20 minutes)

Step 5: Conduct a road test under different driving conditions to verify the effectiveness of the repairs and ensure no codes reappear (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: C0C79 Resolution in a 2018 Ford F-150

Vehicle: 2018 Ford F-150, 45,000 mileage

Problem: Customer reported intermittent issues with door locks and dashboard warning lights.

Diagnosis: Initial inspection revealed corroded connectors leading to communication failure with the BCM.

Solution: Replaced the corroded connectors and cleaned the wiring harness, ensuring proper grounding.

Cost: $250 (including labor and parts)

Result: Post-repair, the vehicle operated normally, with no further issues reported.

Case Study 2: BCM Replacement in a 2017 Honda Accord

Vehicle: 2017 Honda Accord, 30,000 mileage

Problem: Vehicle displayed C0C79 code with multiple warning lights activated.

Diagnosis: Diagnostic testing indicated a failure in the BCM, confirmed by voltage testing.

Solution: Replaced the BCM with an OEM part and recalibrated the system.

Cost: $550 (including parts and labor)

Result: After replacement, all systems functioned as expected, and the C0C79 code was cleared.

Diagnose C0C79

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis

Code Information

Code: C0C79
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes