U039E - Understanding U039E Code and Its Impact on 2015-2018 Ford F-150 and Other Models

Quick Answer

U039E means: U039E indicates a communication failure between control modules in your vehicle.

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

Can I drive with U039E? Immediate diagnosis and repair are recommended to prevent further system failures.

Common Questions

What does U039E mean and how does it affect my car?

The U039E code signifies a communication failure within your vehicle's control modules. This can lead to malfunctioning systems, affecting everything from engine performance to safety features. Ignoring it may result in severe operational problems or safety risks.

What are the most common causes of U039E and how much does it cost to fix?

Common causes include faulty wiring (40% likelihood), defective control modules (30%), and battery health issues (15%). Repairs can range from $150 for wiring fixes to $800 for module replacements, depending on the severity of the problem.

Can I drive my car with U039E or should I stop immediately?

It is advisable to avoid driving until the issue is diagnosed and repaired, as communication failures can lead to unexpected vehicle behavior or system failures, posing safety risks.

How can I diagnose U039E myself using GeekOBD APP?

You can diagnose U039E by connecting the GeekOBD APP to your vehicle, performing an OBD2 scan, and reviewing the codes and freeze frame data. This will help you understand the context of the fault and guide further troubleshooting efforts.

What vehicles are most commonly affected by U039E?

Commonly affected vehicles include the 2015-2018 Ford F-150, 2016-2019 Chevrolet Silverado, and 2017-2020 Honda CR-V. Owners should stay informed about any recalls or technical service bulletins related to communication issues.

How can I prevent U039E from happening again?

Regular maintenance, including battery checks, visual inspections of wiring, and software updates, can help prevent the recurrence of U039E. Additionally, keeping your vehicle clean and dry can reduce the risk of moisture-related issues.

What is U039E?

The OBD2 diagnostic trouble code U039E indicates a communication issue between the various control modules in your vehicle, specifically pointing toward a malfunction in the vehicle's communication network. This code can occur in a range of vehicles, but it is notably prevalent in models like the 2015-2018 Ford F-150. When this code is triggered, it signifies that one of the modules is unable to communicate properly with the others, leading to potential failures in various systems such as the engine, transmission, or anti-lock braking system (ABS). Ignoring this code can result in a range of performance issues, including erratic vehicle behavior, decreased fuel efficiency, and even complete operational failure of critical systems. The U039E code can often manifest during routine diagnostics or when a driver experiences unusual vehicle behavior, such as warning lights illuminating on the dashboard. It is essential to address this issue promptly to maintain vehicle safety and performance.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U039E is present:

  • Check engine light illuminates on the dashboard, indicating a potential issue with vehicle systems.
  • Unusual engine behavior, such as stalling or rough idling, which can be alarming for drivers.
  • Decreased fuel economy, often noticeable as a drop of 10-15% in efficiency, affecting your wallet.
  • Transmission shifting issues, such as hard or delayed shifts that can make driving uncomfortable.
  • Dashboard warning lights may flash intermittently, indicating multiple system failures.

Possible Causes

Most common causes of U039E (ordered by frequency):

  1. {'cause': 'Faulty communication network, which may account for about 40% of U039E occurrences.', 'details': 'Wiring issues, such as damaged or corroded connectors, can disrupt data transfer between modules.'}
  2. {'cause': 'Defective control module, contributing around 30% to the U039E code.', 'technicalExplanation': 'If one of the modules, such as the ABS or engine control module, fails, it can prevent communication.'}
  3. {'cause': 'Poor battery health, which can lead to a 15% likelihood of triggering U039E.', 'preventionTips': 'Regularly test your battery to ensure it holds a charge and replace it as needed to maintain optimal performance.'}
  4. {'cause': 'Software glitches, which can account for 10% of U039E occurrences.', 'details': 'Outdated software can cause miscommunication between control modules.'}
  5. {'cause': 'Less common but serious: Environmental factors like moisture intrusion, affecting 5% of cases.', 'details': 'Water damage to connectors can lead to intermittent communication failures.'}

U039E Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repairing or replacing damaged wiring or connectors in the communication circuit.

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

Replacing a faulty control module that is preventing communication.

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

Updating vehicle software to fix communication issues.

  • Total: $100 - $200
  • Success rate: 75%
Money-Saving Tips for U039E
  • 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 U039E Diagnosis Process

Follow these systematic steps to accurately diagnose U039E. Each step builds on the previous one to ensure accurate diagnosis.

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

Step 1: Conduct an initial visual inspection of wiring and connectors for any obvious 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 to retrieve all codes and freeze frame data, which provides context for the fault (10-15 minutes)

Step 2: Use the GeekOBD APP to perform an OBD2 scan to retrieve all codes and freeze frame data, which provides context for 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 operate within specifications (20-30 minutes)

Step 3: Test suspected components using a multimeter or specialized diagnostic tools to ensure they operate within specifications (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: Perform a system function test to verify proper operation after any repairs and clear the codes (10-15 minutes)

Step 4: Perform a system function test to verify proper operation after any repairs and clear the 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: Conduct a road test under various conditions to confirm that the vehicle operates correctly and that the repair was successful (15-20 minutes)

Step 5: Conduct a road test under various conditions to confirm that the vehicle operates correctly and that the repair was successful (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: Communication Failure in a 2017 Ford F-150

Vehicle: 2017 Ford F-150, 60,000 miles

Problem: Customer reported multiple dashboard warning lights and poor engine performance.

Diagnosis: Initial inspection revealed corroded wiring in the communication network. OBD2 scan confirmed U039E code.

Solution: Repaired damaged wiring and updated software. Cleared codes and confirmed successful communication.

Cost: $250

Result: Vehicle performance returned to normal with all warning lights off.

Case Study 2: Control Module Replacement in a 2016 Chevrolet Silverado

Vehicle: 2016 Chevrolet Silverado, 75,000 miles

Problem: Owner experienced erratic shifting and check engine light on.

Diagnosis: OBD2 scan indicated U039E along with transmission-related codes. Control module was suspected.

Solution: Replaced the faulty transmission control module and performed a software update.

Cost: $600

Result: After repair, the vehicle shifted smoothly with no further issues.

Diagnose U039E

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: U039E
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes