Quick Answer
U0979 means: U0979 indicates a communication failure between control modules in your vehicle.
Can I drive with U0979? Immediate attention is recommended to avoid further damage to vehicle systems.
Common Questions
What does U0979 mean and how does it affect my car?
The U0979 code signifies a communication failure between vehicle control modules, which can result in various performance issues. This could lead to warning lights illuminating on your dashboard and erratic vehicle behavior. Understanding this code is crucial, as it affects the reliability and safety of your vehicle.
What are the most common causes of U0979 and how much does it cost to fix?
Common causes include faulty control modules, damaged wiring, and software issues. Repair costs can vary widely, with control module replacements costing between $500 and $1500, while wiring repairs may be $100 to $300. It's crucial to diagnose the specific issue to obtain an accurate estimate.
Can I drive my car with U0979 or should I stop immediately?
While you may be able to drive your vehicle, it’s not advisable to ignore the U0979 code. Doing so could lead to compromised vehicle control and safety. It's best to address the issue promptly to avoid potential accidents or further damage.
How can I diagnose U0979 myself using GeekOBD APP?
To diagnose U0979 using the GeekOBD APP, connect it to your vehicle's OBD2 port, run a full scan to check for codes, and review the freeze frame data. This information will help you understand the context of the error, allowing for a more informed approach to troubleshooting.
What vehicles are most commonly affected by U0979?
The U0979 code frequently appears in various Ford, GM, and Jeep models, particularly in the Ford F-150 from 2015-2018, Chevrolet Silverado from 2016, and Jeep Grand Cherokee from 2016 onwards. Stay informed about any recalls or technical service bulletins related to these models for additional insights.
How can I prevent U0979 from happening again?
Preventative measures include regular vehicle maintenance, checking and repairing wiring connections, and ensuring software updates are performed as needed. Routine inspections of control modules and their connections can help catch potential issues before they escalate into significant problems.
What is U0979?
The U0979 diagnostic trouble code (DTC) indicates a communication issue between the vehicle's control modules. This code is often triggered when one control module fails to send or receive data from another module, leading to potential performance issues. In simpler terms, your car's brain is unable to talk to its other parts, which can result in various malfunctions. Commonly seen in vehicles such as the 2015-2018 Ford F-150, certain models of Chevrolet Silverado, and Jeep Grand Cherokee from 2016 onwards, this code can manifest as erratic behavior in systems such as traction control, stability control, or even the engine management system. Real-world implications may include warning lights on the dashboard, reduced engine performance, or unexpected vehicle behavior. Ignoring the U0979 code can lead to further complications, including safety concerns as critical systems may not operate correctly. Addressing this code promptly is essential for maintaining vehicle reliability and safety.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0979 is present:
- Check engine light stays on consistently, indicating a persistent error that needs attention.
- Traction control warning light intermittently activates while driving, leading to potential loss of vehicle control.
- Engine performance may fluctuate, with noticeable hesitation during acceleration or deceleration.
- Loss of functionalities such as power windows or locks, suggesting a broader electrical issue.
- Unresponsive dashboard gauges, making it difficult to monitor vehicle performance and status.
Possible Causes
Most common causes of U0979 (ordered by frequency):
- The most common cause of code U0979 is a faulty control module, which can occur in about 40% of cases. This could be due to age, exposure to moisture, or internal failure.
- A second common cause is damaged wiring or connectors between modules (30% likelihood). Corrosion or physical damage can disrupt communication.
- Another cause is software issues within the modules themselves (20% likelihood). An update or reprogramming could resolve these problems.
- Less commonly, a short circuit in the vehicle's electrical system may lead to this DTC (5% likelihood), causing widespread communication failures.
- Rarely, a complete failure of the vehicle's network system (5% likelihood) may result in U0979, often requiring extensive repair.
U0979 Repair Costs
Cost Breakdown by Repair Type
Control Module Replacement
Replacing a faulty control module that is causing U0979.
- Total: $500 - $1500
- Success rate: 85%
Wiring Repair
Repairing or replacing damaged wiring or connectors.
- Total: $100 - $300
- Success rate: 75%
Software Update
Reprogramming or updating the vehicle's control module software.
- Total: $50 - $150
- Success rate: 90%
Money-Saving Tips for U0979
- 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 U0979 Diagnosis Process
Follow these systematic steps to accurately diagnose U0979. 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 multimeter or specific diagnostic tools to test suspected components (20-30 minutes)
Step 3: Component testing - Use 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: Control Module Replacement for a 2017 Ford F-150
Vehicle: 2017 Ford F-150, 45,000 miles
Problem: Customer reported check engine light and intermittent traction control warning.
Diagnosis: Using the GeekOBD APP, multiple codes were identified, including U0979. A visual inspection revealed a damaged control module.
Solution: Replaced the faulty control module and cleared the codes.
Cost: $1200 (including parts and labor)
Result: The vehicle operated normally post-repair, with no further warning lights.
Case Study 2: Wiring Repair on a 2016 Chevrolet Silverado
Vehicle: 2016 Chevrolet Silverado, 60,000 miles
Problem: Customer experienced fluctuating engine performance and dashboard gauge issues.
Diagnosis: DTC U0979 was retrieved. Inspection revealed corroded wiring connections.
Solution: Repaired the damaged wiring and ensured secure connections throughout.
Cost: $250 (parts and labor included)
Result: Post-repair, the vehicle regained consistent performance with all gauges functioning correctly.