U0986 - Understanding DTC U0986: Common in 2015-2019 Ford F-150 and Other Models

Quick Answer

U0986 means: U0986 indicates a communication failure between vehicle control modules.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with U0986? Immediate investigation is recommended to avoid further electrical issues.

Common Questions

What does U0986 mean and how does it affect my car?

U0986 signifies a communication error between various control modules in your vehicle, which can lead to malfunctioning accessories or safety features. If left unchecked, it can cause further electrical issues, impacting your vehicle's reliability.

What are the most common causes of U0986 and how much does it cost to fix?

Common causes include wiring damage (40% likelihood), BCM failure (30%), and software glitches. Repair costs can range from $100 for software updates to $800 for BCM replacement, depending on the issue.

Can I drive my car with U0986 or should I stop immediately?

While driving is possible, it's not advisable as it may lead to malfunctioning safety systems. Immediate investigation is recommended to prevent potential hazards.

How can I diagnose U0986 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform an OBD2 scan to check for U0986 and other codes. The app will provide freeze frame data, helping you understand when the issue occurred and under what conditions.

What vehicles are most commonly affected by U0986?

U0986 is frequently reported in models like the 2015-2019 Ford F-150, 2016-2018 Chevrolet Silverado, and 2017-2019 Dodge Ram. Always check for recalls or Technical Service Bulletins (TSBs).

How can I prevent U0986 from happening again?

Regular maintenance, including checking wiring and connections, keeping software updated, and performing visual inspections can help prevent recurrence of U0986.

What is U0986?

DTC U0986 is a diagnostic trouble code that indicates a communication problem with the vehicle's control module. Specifically, it relates to the transfer of data between the vehicle's various electrical systems, particularly the Body Control Module (BCM) and other module(s) like the Engine Control Unit (ECU) or other accessory modules. When this code is triggered, it means that the BCM has detected an issue where it cannot communicate effectively with another module, which can lead to various electrical problems in the vehicle. This can manifest in multiple ways, including erratic behavior of electrical systems, malfunctioning lights, or failure of certain features to operate correctly. The real-world implications of U0986 can range from minor inconveniences to significant vehicle safety issues, depending on the affected systems. For instance, in models like the 2015-2019 Ford F-150, you might notice issues with the power windows, door locks, or dashboard indicators. Addressing this code promptly is crucial to ensure the vehicle operates safely and reliably. Ignoring this code can exacerbate underlying issues, potentially leading to more expensive repairs down the road.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0986 is present:

  • The check engine light may illuminate or flash intermittently, indicating a problem with vehicle diagnostics.
  • Power features such as windows, locks, or mirrors may operate erratically or fail to respond.
  • Dashboard warning lights may activate without reason, causing confusion about actual vehicle status.
  • Inconsistent performance of accessories like the stereo or navigation system can be experienced, leading to user frustration.
  • Loss of communication with other modules might cause systems like traction control or anti-lock brakes to malfunction.

Possible Causes

Most common causes of U0986 (ordered by frequency):

  1. The most common cause of U0986 is damaged wiring or connectors in the communication circuit, with about 40% likelihood. Inspect for frayed wires or corrosion.
  2. Another frequent cause is a malfunctioning BCM, which can disrupt communication, accounting for roughly 30% of cases. Testing the BCM with specialized equipment can pinpoint this issue.
  3. Thirdly, software glitches or outdated firmware in the control modules can lead to communication failures. Keeping software updated is essential for prevention.
  4. Less commonly, physical damage from accidents can affect module placement, causing disconnections. An inspection can reveal any such issues.
  5. A rare but possible cause includes a faulty ground connection, which can interrupt signals between modules. Regular maintenance checks can help identify these problems.

U0986 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repairing damaged wiring and connectors in the communication circuit.

  • Total: $150 - $300
  • Success rate: 85%
BCM Replacement

Replacing the Body Control Module if found defective.

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

Updating the vehicle's software to correct communication issues.

  • Total: $100 - $150
  • Success rate: 75%
Money-Saving Tips for U0986
  • 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 U0986 Diagnosis Process

Follow these systematic steps to accurately diagnose U0986. 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 Case: 2016 Ford F-150 with U0986

Vehicle: 2016 Ford F-150, 65,000 miles

Problem: Customer reported erratic behavior of power windows and dashboard lights.

Diagnosis: After scanning with the GeekOBD APP, U0986 was identified. A visual inspection revealed damaged wiring near the driver's side door.

Solution: Repaired the damaged wiring and reconnected loose connectors.

Cost: $200 (wiring repair)

Result: All electrical systems functioned correctly post-repair, and no further issues were reported.

Case Study 2: Repair Case: 2018 Chevrolet Silverado with U0986

Vehicle: 2018 Chevrolet Silverado, 50,000 miles

Problem: Customer experienced intermittent loss of dashboard indicators.

Diagnosis: Using the GeekOBD APP, the technician confirmed U0986. Further testing showed a faulty BCM.

Solution: Replaced the Body Control Module.

Cost: $600 (BCM replacement)

Result: The vehicle's electrical systems returned to normal operation, resolving the customer's complaints.

Diagnose U0986

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: U0986
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes