U0A86 - Understanding the Vehicle Communication Network Failure in 2015-2020 Ford F-150 and Other Models

Quick Answer

U0A86 means: U0A86 indicates a communication issue within the vehicle's network, often impacting various modules.

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

Can I drive with U0A86? Immediate attention is advised to prevent further complications.

Common Questions

What does U0A86 mean and how does it affect my car?

The U0A86 code indicates a communication failure within your vehicle's network, potentially affecting multiple systems. This can lead to warning lights appearing on your dashboard and may cause critical systems like power steering, braking, or engine control to malfunction, ultimately impacting the safety and drivability of your vehicle.

What are the most common causes of U0A86 and how much does it cost to fix?

Common causes of U0A86 include damaged wiring (60% likelihood), faulty control modules, and software glitches. Repair costs can range from $50 for software updates to over $800 for control module replacements, depending on the severity of the issue.

Can I drive my car with U0A86 or should I stop immediately?

While it may be possible to drive with U0A86, it's advised to stop immediately if you experience any erratic behavior or warning lights. Ignoring the issue could lead to further damage and unsafe driving conditions.

How can I diagnose U0A86 myself using GeekOBD APP?

To diagnose U0A86 using the GeekOBD APP, start by connecting the app to your vehicle's OBD2 port. Perform a full system scan to retrieve all codes and check for freeze frame data for context. Pay attention to any other codes that may appear alongside U0A86 for a more comprehensive understanding of the issue.

What vehicles are most commonly affected by U0A86?

U0A86 is commonly found in vehicles like the 2015-2020 Ford F-150, 2016-2020 Chevy Silverado, and various models from Toyota and Honda. It's essential to check for any recalls or technical service bulletins (TSBs) related to communication failures for your specific model.

How can I prevent U0A86 from happening again?

To prevent U0A86 from recurring, regularly inspect your vehicle's wiring and connectors for signs of wear or corrosion. Keeping your vehicle's software updated and promptly addressing any warning lights can also help mitigate future issues.

What is U0A86?

The diagnostic trouble code (DTC) U0A86 indicates a communication issue within the vehicle's network, specifically a fault detected in the vehicle's communication bus. This code is often associated with the Controller Area Network (CAN) bus system, which allows various control modules to communicate with each other. When U0A86 is triggered, it suggests that one or more modules are unable to send or receive data properly, which can lead to various malfunctions in vehicle systems. Common symptoms may include warning lights on the dashboard, erratic vehicle behavior, or even a complete loss of functionality for certain features like the infotainment system or advanced driver-assistance systems (ADAS). It's crucial for car owners to address this code promptly, as ignoring it can lead to further complications and potentially increase repair costs. In vehicles like the 2015-2020 Ford F-150, this issue can arise due to damaged wiring, corroded connectors, or faulty modules. Understanding the implications of this code is essential for maintaining vehicle performance and safety.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0A86 is present:

  • The check engine light is illuminated, staying on continuously until the issue is resolved.
  • The vehicle experiences erratic behavior, such as sudden loss of power or failure of electronic components.
  • Fuel economy may decrease by up to 15% due to communication failures affecting engine management systems.
  • Advanced driver-assistance features, like lane keeping assist, may malfunction intermittently.
  • Infotainment system may freeze or reset unexpectedly, disrupting normal operations.

Possible Causes

Most common causes of U0A86 (ordered by frequency):

  1. The most common cause is damaged wiring or connectors in the CAN bus system, with a likelihood of around 60%. Regular inspections can help prevent this.
  2. A second common cause could be a faulty control module, such as the body control module (BCM), which may require replacement or reprogramming.
  3. Thirdly, software glitches or outdated firmware in the vehicle's modules can lead to communication issues. Keeping software updated can help mitigate these problems.
  4. Less common but serious causes include water intrusion in electrical connectors, which can cause short circuits and significant damage.
  5. Rarely, a factory defect in a control unit could lead to this code being triggered, requiring specialized diagnostic equipment to identify.

U0A86 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repairing or replacing damaged wiring and connectors in the CAN bus system.

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

Replacing a faulty control module, such as the BCM, with a new or refurbished unit.

  • Total: $300 - $800
  • Success rate: 90%
Software Update

Updating the vehicle's software to correct potential glitches in communication.

  • Total: $50 - $150
  • Success rate: 70%
Money-Saving Tips for U0A86
  • 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 U0A86 Diagnosis Process

Follow these systematic steps to accurately diagnose U0A86. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Conduct an initial visual inspection of the vehicle's wiring and connectors for any visible signs of damage or corrosion (5-10 minutes)

Step 1: Conduct an initial visual inspection of the vehicle's wiring and connectors for any visible signs of 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 the GeekOBD APP to perform an OBD2 scan and retrieve all stored codes, including freeze frame data to understand the context of the fault (10-15 minutes)

Step 2: Use the GeekOBD APP to perform an OBD2 scan and retrieve all stored codes, including freeze frame data to understand the context of the fault (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: Test suspected components using a multimeter or specialized diagnostic tools to ensure they are functioning properly (20-30 minutes)

Step 3: Test suspected components using a multimeter or specialized diagnostic tools to ensure they are functioning properly (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 making necessary repairs, conduct a system function test to verify proper operation and clear any diagnostic codes (10-15 minutes)

Step 4: After making necessary repairs, conduct a system function test to verify proper operation and clear any diagnostic 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: Perform a road test under various conditions to confirm that the issue has been resolved and that the vehicle operates as intended (15-20 minutes)

Step 5: Perform a road test under various conditions to confirm that the issue has been resolved and that the vehicle operates as intended (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: Ford F-150 U0A86 Communication Issue

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

Problem: Customer reported a check engine light and malfunctioning infotainment system.

Diagnosis: Initial inspection revealed corrosion in the CAN bus connector. OBD2 scan confirmed U0A86 code.

Solution: Replaced the corroded connector and tested the wiring for continuity. Code cleared successfully.

Cost: $200 (parts and labor included)

Result: Infotainment system and other vehicle functions returned to normal operation.

Case Study 2: Chevy Silverado U0A86 Electrical Failure

Vehicle: 2017 Chevy Silverado, 60,000 miles

Problem: Customer experienced intermittent loss of power and dashboard warning lights.

Diagnosis: GeekOBD APP indicated U0A86 and multiple other communication codes. Further testing revealed a faulty body control module.

Solution: Replaced the body control module and reprogrammed it to the vehicle's specifications.

Cost: $750 (including parts and programming fees)

Result: Vehicle functioned correctly after repair, with all warning lights extinguished.

Diagnose U0A86

Use GeekOBD APP for professional diagnosis!

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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: U0A86
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes