U0185 - Communication Bus 'A' Off - Common Issue in 2015-2019 Ford and Jeep Models

Quick Answer

U0185 means: The U0185 code indicates a communication issue with the vehicle's bus 'A' network.

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

Can I drive with U0185? Immediate attention is recommended to prevent further electrical problems.

Common Questions

What does U0185 mean and how does it affect my car?

The U0185 code signifies a communication breakdown within your vehicle's electrical system. This can lead to various performance issues, including non-functioning features like ABS or cruise control. Addressing this code promptly is vital to ensure safe vehicle operation.

What are the most common causes of U0185 and how much does it cost to fix?

Common causes include damaged wiring, faulty modules, or corrosion in connectors. Repair costs can vary widely, typically ranging from $150 for wiring repairs to over $1200 for module replacements, depending on the extent of the issue.

Can I drive my car with U0185 or should I stop immediately?

While it may be possible to drive short distances, it's not advisable to ignore U0185. Doing so can lead to further electrical issues or safety hazards. It's best to have the vehicle inspected as soon as possible.

How can I diagnose U0185 myself using GeekOBD APP?

After downloading the GeekOBD APP, connect it to your vehicle’s OBD2 port. Use the app to scan for DTCs and analyze freeze frame data. This will help you understand the context of the fault and guide you in troubleshooting the issue.

What vehicles are most commonly affected by U0185?

This code is frequently seen in models like the 2015-2019 Ford F-150 and Jeep Grand Cherokee, among others. Owners of these vehicles should be vigilant for symptoms related to communication failures.

How can I prevent U0185 from happening again?

Regular maintenance checks, especially on wiring and electrical connections, can help prevent U0185. Additionally, avoid installing aftermarket electronics without professional guidance to minimize interference with the vehicle's bus network.

What is U0185?

The diagnostic trouble code (DTC) U0185 indicates that there is a communication issue within the vehicle's electrical system, specifically with the bus 'A' network. This network is responsible for facilitating communication between various control modules in the vehicle, such as the engine control unit (ECU), transmission control unit (TCU), and other essential components. When U0185 is triggered, it signifies that one of these modules is unable to communicate with the others, leading to potential issues with vehicle performance and functionality. Real-world implications of this code can include malfunctioning features that depend on inter-module communication, such as stability control systems, anti-lock braking systems (ABS), and even power steering functions. If you're experiencing U0185, it's crucial to address the issue promptly, as ignoring it could lead to more serious electrical failures or costly repairs down the line. This code is typically found in various vehicle makes, but it’s particularly common in models like the 2015-2019 Ford F-150 and Jeep Grand Cherokee, which have been reported by owners to experience these communication failures frequently.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0185 is present:

  • The check engine light or warning lights may illuminate on the dashboard, signaling a communication error.
  • You may notice that certain features, such as the cruise control or ABS, stop functioning altogether, making the driving experience less safe.
  • In some cases, the vehicle may experience erratic behavior, such as unexpected engine stalling or inability to start due to communication failure.
  • Additionally, you might experience delayed responses from the vehicle’s electronic systems, affecting overall performance.
  • Fuel economy may also suffer, as the vehicle's systems may not be able to optimize performance without proper communication.

Possible Causes

Most common causes of U0185 (ordered by frequency):

  1. The most common cause of U0185 is a disconnected or damaged wiring harness, accounting for about 60% of cases. This can happen due to wear and tear, environmental factors, or poor installation during repairs.
  2. A malfunctioning module, such as the ECU or TCU, can also trigger this code. This technical issue may arise from software glitches or physical damage to the module itself, making up approximately 25% of cases.
  3. Corrosion in connectors or terminals can lead to communication failures as well. Regular maintenance and inspection can help prevent this issue by ensuring connections remain clean and secure.
  4. Less common causes include faulty sensors or interference from aftermarket electronics, which can disrupt the bus communication.
  5. In rare instances, a complete failure of the vehicle's onboard diagnostic system can occur, leading to long-term issues if not addressed.

U0185 Repair Costs

Cost Breakdown by Repair Type

Wiring Harness Repair

Repair or replacement of damaged wiring harness and connectors.

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

Replacing a faulty control module that is unable to communicate.

  • Total: $300 - $1200
  • Success rate: 90%
Electrical System Inspection

Comprehensive inspection of the vehicle's electrical system to identify issues.

  • Total: $100 - $200
  • Success rate: 80%
Money-Saving Tips for U0185
  • 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 U0185 Diagnosis Process

Follow these systematic steps to accurately diagnose U0185. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Conduct an initial visual inspection of the wiring harness and connectors related to the bus 'A' network

Step 1: Conduct an initial visual inspection of the wiring harness and connectors related to the bus 'A' network. Look for obvious damage, corrosion, or loose connections (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 a full OBD2 scan

Step 2: Use the GeekOBD APP to perform a full OBD2 scan. Retrieve all stored codes and freeze frame data to analyze 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 specific diagnostic tools to check for proper voltage and ground connections (20-30 minutes)

Step 3: Test suspected components using a multimeter or specific diagnostic tools to check for proper voltage and ground connections (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 addressing the issue, perform a system function test to ensure all modules are communicating correctly

Step 4: After addressing the issue, perform a system function test to ensure all modules are communicating correctly. Clear the codes and check for any reoccurrences (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 driving conditions to ensure all systems function as intended and verify the repairs were successful (15-20 minutes)

Step 5: Conduct a road test under various driving conditions to ensure all systems function as intended and verify the repairs were 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: Wiring Harness Repair for a 2017 Ford F-150

Vehicle: 2017 Ford F-150, 45,000 miles

Problem: Customer reported multiple warning lights and intermittent loss of power steering.

Diagnosis: Visual inspection revealed a frayed wiring harness near the steering column.

Solution: Repaired the wiring harness and replaced damaged connectors.

Cost: $250

Result: All warning lights cleared, and power steering function was restored.

Case Study 2: Module Replacement on a 2016 Jeep Grand Cherokee

Vehicle: 2016 Jeep Grand Cherokee, 60,000 miles

Problem: Vehicle would not start, and multiple electronic features were inoperative.

Diagnosis: Diagnostic scan indicated U0185, further inspection revealed a failed ECU.

Solution: Replaced the ECU with a new unit and reprogrammed it.

Cost: $950

Result: Vehicle started successfully, and all systems were operational after repair.

Diagnose U0185

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: U0185
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes