Quick Answer
U0B79 means: U0B79 indicates a communication problem between vehicle modules.
Can I drive with U0B79? It is advisable to address this issue immediately to avoid further complications.
Common Questions
What does U0B79 mean and how does it affect my car?
The U0B79 code signifies a communication failure between various electronic modules in your vehicle, leading to potential performance issues. It can affect everything from engine performance to safety features. If left unresolved, it may result in increased repair costs and further complications.
What are the most common causes of U0B79 and how much does it cost to fix?
Common causes include damaged wiring (40% likelihood) and faulty control modules, with repair costs ranging from $100 to $1200 depending on the issue. Regular vehicle maintenance can help reduce the chances of this code appearing.
Can I drive my car with U0B79 or should I stop immediately?
While you may be able to drive your vehicle, it is not advisable to ignore the U0B79 code. Continuing to drive can lead to serious safety issues and further damage to your vehicle's systems.
How can I diagnose U0B79 myself using GeekOBD APP?
To diagnose the U0B79 code, connect the GeekOBD APP to your vehicle's OBD2 port. Scan for codes and review freeze-frame data to understand the conditions that triggered the fault. Look for any other related codes as well.
What vehicles are most commonly affected by U0B79?
The U0B79 code is frequently reported in vehicles such as the 2016 Chevrolet Silverado, 2017 Ford F-150, and 2019 Honda Accord. Check for any recalls or Technical Service Bulletins (TSBs) related to communication issues for your specific model.
How can I prevent U0B79 from happening again?
To prevent the U0B79 code, perform regular inspections of wiring and connectors, keep your vehicle’s software updated, and address any electrical issues promptly. Regular maintenance can help catch problems before they escalate.
What is U0B79?
The U0B79 diagnostic trouble code (DTC) indicates a communication issue within the vehicle's network. This code is often associated with problems in the Controller Area Network (CAN) communication between different modules in the vehicle. When the U0B79 code is triggered, it typically means that one module is unable to communicate with another, which can lead to various operational failures. For example, if you're driving a 2016 Chevrolet Silverado, you might notice that certain functionalities, like the infotainment system or safety features, may not work as intended. It's crucial to understand that this code can often lead to additional issues if not addressed promptly, including performance degradation, reduced fuel efficiency, or even safety concerns. Ignoring the U0B79 code can lead to cascading failures in other systems, as the modules rely on each other for proper function. This code is particularly prevalent in vehicles manufactured after 2015, where multiple electronic systems are integrated. Regular diagnostic checks and timely repairs can help mitigate the risks associated with this code, ensuring your vehicle operates smoothly and safely.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0B79 is present:
- The check engine light (CEL) may remain illuminated, indicating a fault in vehicle systems.
- You might experience erratic behavior in electronic systems, like the radio cutting out or dashboard lights flickering.
- Fuel economy may decrease noticeably, potentially by 10-15%, due to improper engine management.
- Warning messages may appear on the dashboard, such as 'Service Stabilitrak' or 'Check Traction Control'.
- Certain safety features, like lane assist or adaptive cruise control, may become non-functional.
Possible Causes
Most common causes of U0B79 (ordered by frequency):
- A faulty or damaged CAN bus wiring, which is the most common cause at about 40%. This could be due to wear and tear or environmental factors.
- Malfunctioning control modules, such as the Engine Control Module (ECM) or Transmission Control Module (TCM), can also trigger this code due to internal failures.
- Poor connections or corrosion at connectors can lead to communication failures; regular checks can help prevent this.
- Less common, but serious issues can arise from a failing battery or alternator, affecting the voltage supply to the vehicle's systems.
- Rarely, software issues in one of the control modules can cause communication breakdowns, requiring a software update or reprogramming.
U0B79 Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Repairing or replacing damaged CAN bus wiring.
- Total: $100 - $300
- Success rate: 85%
Module Replacement
Replacing faulty control modules.
- Total: $500 - $1200
- Success rate: 90%
Software Update
Updating the software of control modules to rectify communication issues.
- Total: $50 - $150
- Success rate: 75%
Money-Saving Tips for U0B79
- 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 U0B79 Diagnosis Process
Follow these systematic steps to accurately diagnose U0B79. 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 (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success (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: Repairing Communication Issues in a 2016 Chevrolet Silverado
Vehicle: 2016 Chevrolet Silverado, 50,000 miles
Problem: Customer reported multiple warning lights and intermittent infotainment system failures.
Diagnosis: After scanning for DTCs, U0B79 was identified alongside other codes indicating module communication issues.
Solution: Replaced damaged wiring in the CAN bus and reprogrammed the ECM.
Cost: $450 (wiring repair: $200, reprogramming: $250)
Result: Post-repair, all modules communicated effectively, and the customer's vehicle performance was restored.
Case Study 2: Resolving U0B79 in a 2019 Honda Accord
Vehicle: 2019 Honda Accord, 30,000 miles
Problem: Owner experienced erratic dashboard lights and non-functioning lane assist.
Diagnosis: Diagnostic testing revealed U0B79 along with a software issue in the TCM.
Solution: Updated the TCM software and cleared the communication error.
Cost: $100 (software update)
Result: After the update, the lane assist and dashboard functions were restored, and the vehicle operated normally.