U077F - Understanding the U077F Code in 2015-2019 Ford F-150 and Other Models

Quick Answer

U077F means: U077F indicates a communication error between control modules in your vehicle.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with U077F? Immediate attention is recommended to prevent further issues.

Common Questions

What does U077F mean and how does it affect my car?

The U077F code signifies a communication issue between your vehicle's control modules. This can lead to various symptoms such as engine hesitation, poor fuel economy, and malfunctioning electronic features. It's important to address this code to avoid further complications.

What are the most common causes of U077F and how much does it cost to fix?

Common causes of U077F include faulty wiring (60% likelihood), a malfunctioning BCM (25%), and software compatibility issues (10%). Repair costs can range from $100 to $800 depending on the specific issue and parts needed.

Can I drive my car with U077F or should I stop immediately?

While you may be able to drive short distances, it is recommended to stop using the vehicle immediately if any symptoms arise, as this could lead to more serious issues or safety risks.

How can I diagnose U077F myself using GeekOBD APP?

To diagnose U077F using the GeekOBD APP, connect the app to your vehicle’s OBD2 port. Run a full diagnostic scan to pull up all DTCs, then analyze the freeze frame data for context on the U077F code.

What vehicles are most commonly affected by U077F?

The U077F code is often found in vehicles like the 2015-2019 Ford F-150, Honda Accord (2014-2018), and Chevrolet Silverado (2014-2019). These models use advanced electronic systems that can be sensitive to communication failures.

How can I prevent U077F from happening again?

To prevent U077F from recurring, ensure regular maintenance checks on your vehicle's electrical systems, avoid aftermarket modifications that affect electronics, and keep the vehicle updated with the latest software from your dealership.

What is U077F?

The diagnostic trouble code (DTC) U077F indicates a communication error between the vehicle's control modules, specifically regarding the data link communication. This code typically arises when there is a failure in the communication line or an issue with a specific module, such as the Body Control Module (BCM) or the Powertrain Control Module (PCM). In simpler terms, it means that one part of your vehicle's electronic system is unable to talk properly to another part, which can lead to various functionality issues. For example, you may notice that your vehicle's stability control system or certain electronic features are not working as intended. This can affect vehicles that rely heavily on electronic systems for operation, such as the 2015 to 2019 Ford F-150, which is known for integrating numerous electronic components for enhanced performance and safety. Ignoring this code could lead to further complications, including impaired safety features, increased fuel consumption, and even engine performance issues. Therefore, it's crucial to address the U077F code promptly to ensure your vehicle operates optimally.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U077F is present:

  • Check engine light stays on constantly, indicating a persistent issue that needs attention.
  • Engine hesitates during acceleration, leading to an inconsistent driving experience, especially at highway speeds.
  • Fuel economy decreased by 10-15%, which can significantly affect your overall driving costs.
  • Air conditioning or heating system may malfunction, leading to uncomfortable cabin conditions.
  • Stability control light may activate, indicating potential safety risks while driving.

Possible Causes

Most common causes of U077F (ordered by frequency):

  1. {'commonCause': 'Faulty wiring or connectors in the communication line (60%) - This is the most frequent reason for the U077F code. Damaged wires or loose connections can disrupt the signals sent between modules.', 'technicalExplanation': 'If wires are frayed or corroded, they can lead to intermittent connectivity, causing communication errors.'}
  2. {'secondCommonCause': 'Malfunctioning Body Control Module (BCM) (25%) - The BCM controls various electronic features. If it fails, it can prevent communication with other modules.', 'technicalExplanation': 'This may happen due to software issues or electrical shorts within the BCM itself.'}
  3. {'thirdCause': 'Software incompatibility (10%) - Occasionally, updates or changes to one control module can lead to incompatible software versions across modules.', 'preventionTips': 'Regularly check for software updates from your dealership or trusted mechanic.'}
  4. {'lessCommonCause': 'Failed Powertrain Control Module (PCM) (4%) - A rare but serious issue where the main engine control unit fails, requiring replacement.', 'details': 'This can lead to a complete loss of engine performance and requires immediate attention.'}
  5. {'rareCause': 'External electrical interference (1%) - Uncommon, but can occur from aftermarket electronics that disrupt normal operations.', 'details': 'Avoid installing non-certified devices that connect to your vehicle’s electronics.'}

U077F Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repair or replace damaged wiring and connectors to restore communication.

  • Total: $100 - $300
  • Success rate: 80%
Body Control Module Replacement

Replacing the Body Control Module if it is determined to be faulty.

  • Total: $400 - $800
  • Success rate: 90%
Software Update

Performing a software update to ensure all modules are compatible.

  • Total: $50 - $150
  • Success rate: 75%
Money-Saving Tips for U077F
  • 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 U077F Diagnosis Process

Follow these systematic steps to accurately diagnose U077F. 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).

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 (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).

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 suspected components (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (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 - 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).

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 repair success (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (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: Repair of U077F in a 2016 Ford F-150

Vehicle: 2016 Ford F-150, 45,000 miles

Problem: The customer reported a persistent check engine light and intermittent engine hesitation.

Diagnosis: Diagnostic scans revealed the U077F code alongside other communication errors. A visual inspection showed corroded wiring in the communication harness.

Solution: Repaired the damaged wiring and cleared the codes. Performed a system function test to ensure all modules were communicating properly.

Cost: $250 (including parts and labor)

Result: The check engine light remained off and the vehicle performed normally following the repair.

Case Study 2: Addressing U077F in a 2018 Chevrolet Silverado

Vehicle: 2018 Chevrolet Silverado, 30,000 miles

Problem: The driver experienced erratic behavior of the stability control system and check engine light activation.

Diagnosis: A full scan led to the U077F code. Further inspection identified a software mismatch between the BCM and PCM.

Solution: Updated the software in both modules to restore proper communication.

Cost: $120 (software update)

Result: All systems returned to normal operation, and the customer reported no further issues.

Diagnose U077F

Use GeekOBD APP for professional diagnosis!

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

Code: U077F
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes