Quick Answer
U079A means: The U079A code indicates a communication issue between vehicle control modules.
Can I drive with U079A? Immediate attention is recommended to prevent further complications.
Common Questions
What does U079A mean and how does it affect my car?
The U079A code indicates a failure in communication between essential vehicle control modules, which can lead to poor performance and safety issues. If not addressed, you might experience reduced acceleration, erratic shifting, and a decrease in overall fuel efficiency.
What are the most common causes of U079A and how much does it cost to fix?
Common causes include faulty wiring, module malfunctions, and software issues. Repair costs can range from $50 for a software update to over $1,200 for module replacement, depending on the severity of the issue.
Can I drive my car with U079A or should I stop immediately?
While you might be able to drive your vehicle, it is not advisable as it can lead to unpredictable performance and safety risks. It’s best to seek diagnostic help as soon as possible.
How can I diagnose U079A myself using GeekOBD APP?
To diagnose U079A, connect the GeekOBD APP to your vehicle’s OBD2 port. Begin by scanning for all codes and reviewing freeze frame data. This will provide insights into when the code triggered and the parameters at that time.
What vehicles are most commonly affected by U079A?
This code frequently appears in vehicles like the 2015-2018 Ford F-150, 2016-2018 Chevrolet Silverado, and several models from Jeep and Dodge. Always check for known recalls or technical service bulletins (TSBs) related to communication issues.
How can I prevent U079A from happening again?
Regular vehicle maintenance, including wiring inspections and software updates, can prevent U079A. Ensure connections are clean and secure, and consider periodic scans with the GeekOBD APP to catch issues early.
What is U079A?
The U079A trouble code is a generic diagnostic trouble code that indicates a communication error between the vehicle's control modules, specifically related to the network communication system. This code often appears in vehicles like the 2015-2018 Ford F-150, where a malfunction in the communication bus system can disrupt essential functions such as engine performance, transmission control, and even safety features. When the U079A code is triggered, it signifies that one of the modules, such as the Engine Control Module (ECM), Transmission Control Module (TCM), or Body Control Module (BCM), is unable to communicate effectively with other modules. This can lead to symptoms like poor fuel economy, erratic shifting, or warning lights on the dashboard. In some cases, the vehicle may enter a 'limp' mode, restricting speed and throttle response to prevent further damage. If left unresolved, the U079A code can lead to significant performance issues and potential safety hazards, making it crucial for car owners to address the problem promptly.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U079A is present:
- Check engine light illuminates and stays on, indicating a persistent issue with vehicle systems.
- Engine exhibits hesitations during acceleration, making it feel sluggish or unresponsive at times.
- Fuel economy drops significantly, often by 10-15%, affecting your wallet and driving experience.
- Dashboard warning lights may flicker or illuminate intermittently, indicating electrical system instability.
- Transmission may experience shifting problems, such as slipping or harsh shifts, leading to a rough driving experience.
Possible Causes
Most common causes of U079A (ordered by frequency):
- The most common cause of U079A (50% likelihood) is a faulty module or wiring issue, which disrupts communication between systems. This could stem from damaged connectors or corroded wires.
- Another frequent cause is software glitches in the control modules, which can often be resolved with a simple software update from the dealership.
- A worn-out fuse or relay (30% likelihood) can also lead to communication failures; regular checks during maintenance can help prevent this.
- Less commonly, a complete module failure (10% likelihood) may occur, necessitating a replacement, which can be costly.
- In rare cases, an underlying issue within the vehicle’s electrical system, such as parasitic drains or battery problems, may cause the U079A code to appear.
U079A Repair Costs
Cost Breakdown by Repair Type
Module Replacement
Replacing the faulty control module that is causing communication issues.
- Total: $300 - $1,200
- Success rate: 85%
Wiring Repair
Repairing or replacing damaged wiring and connectors.
- Total: $100 - $500
- Success rate: 75%
Software Update
Performing a software update to resolve communication glitches.
- Total: $50 - $150
- Success rate: 90%
Money-Saving Tips for U079A
- 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 U079A Diagnosis Process
Follow these systematic steps to accurately diagnose U079A. 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: 2017 Ford F-150 U079A Repair
Vehicle: 2017 Ford F-150, 45,000 miles
Problem: Customer reported check engine light and poor acceleration.
Diagnosis: Initial OBD2 scan revealed U079A along with other communication codes. Visual inspection showed corroded wiring.
Solution: Replaced damaged wiring and performed a software update.
Cost: $450 (wiring $250, software $100, labor $100)
Result: Customer reported improved acceleration and no further check engine light.
Case Study 2: 2016 Chevrolet Silverado Communication Issue
Vehicle: 2016 Chevrolet Silverado, 60,000 miles
Problem: Check engine light and shifting problems.
Diagnosis: Found U079A code. Diagnosed faulty transmission control module.
Solution: Replaced transmission control module and recalibrated the system.
Cost: $1,000 (module $800, labor $200)
Result: Vehicle performed correctly post-repair without further issues.