Quick Answer

U05E9 means: U05E9 signifies a communication issue between control modules in your vehicle.

Fix: Check and replace faulty components Cost: $150 - $500 Time: 90-180 minutes

Can I drive with U05E9? Immediate attention is recommended to prevent potential safety issues.

Common Questions

What does U05E9 mean and how does it affect my car?

The U05E9 code indicates a communication failure between control modules. This can affect various vehicle functions, such as engine performance, safety systems, and electronic features. If left unresolved, you may experience performance issues, warning lights, and, in some cases, complete system failures.

What are the most common causes of U05E9 and how much does it cost to fix?

Common causes include damaged wiring (50% likelihood) and faulty modules (30% likelihood). Repair costs can range from $150 for wiring repairs to over $1200 for module replacements, depending on the specific issue.

Can I drive my car with U05E9 or should I stop immediately?

While you may be able to drive your vehicle, doing so is not recommended. The communication error can lead to safety system failures and unpredictable vehicle behavior, posing a risk to you and others on the road.

How can I diagnose U05E9 myself using GeekOBD APP?

Using the GeekOBD APP, connect it to your vehicle's OBD2 port and scan for trouble codes. Pay attention to any additional codes or freeze frame data that may help you understand the context of the U05E9 code.

What vehicles are most commonly affected by U05E9?

U05E9 is frequently seen in Ford and Chrysler models produced between 2013 and 2019, including the Ford F-150 and Chrysler 300. Always check for any recalls or Technical Service Bulletins (TSBs) associated with these models.

How can I prevent U05E9 from happening again?

Regular vehicle maintenance, including inspecting wiring and connectors, addressing water leaks, and updating software for control modules can help prevent U05E9 from recurring.

What is U05E9?

The diagnostic trouble code (DTC) U05E9 indicates a communication error between the various control modules in your vehicle. This code typically occurs when there is a failure in the communication network, preventing modules from sharing important data. In many modern vehicles, especially those manufactured by Ford and Chrysler from 2013 to 2019, the various systems rely heavily on a network of interconnected control units, such as the Engine Control Module (ECM), Transmission Control Module (TCM), and Body Control Module (BCM). If one module cannot communicate with another, it can lead to various operational issues ranging from engine performance problems to safety system failures. For example, you might find that your vehicle's ABS system is disabled, or the check engine light is illuminated due to this communication error. Ignoring the U05E9 code can lead to more severe problems over time, including unexpected vehicle behavior, potentially resulting in dangerous situations. Therefore, it's crucial to address the underlying issues associated with this code promptly.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U05E9 is present:

  • The check engine light stays on constantly, indicating that there's an underlying issue that needs to be addressed.
  • Intermittent loss of power or engine hesitation, which can be particularly noticeable during acceleration.
  • Fuel economy has decreased significantly, potentially by 10-15%, due to the engine running inefficiently.
  • Warning lights for systems such as ABS or traction control may illuminate, indicating failures in those systems.
  • Inconsistent operation of electronic accessories, such as power windows or door locks, due to communication disruption.

Possible Causes

Most common causes of U05E9 (ordered by frequency):

  1. The most common cause is damaged wiring or loose connections, which account for about 50% of cases. Corroded connectors can interrupt communication between modules.
  2. A failing module, such as the ECM or BCM, is the second most common cause, responsible for around 30% of the issues. This can occur due to age or software glitches.
  3. Poor grounding in the vehicle's electrical system can lead to communication errors. Regular inspections can help prevent this issue.
  4. Less common but serious causes include water intrusion into control modules, often due to leaks or faulty seals, which can cause extensive damage.
  5. A rare but possible cause is a faulty CAN bus, the network through which modules communicate, which may require specialized diagnostic tools to identify.

U05E9 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repair or replace damaged wiring and connectors to restore communication.

  • Total: $150 - $500
  • Success rate: 85%
Module Replacement

Replace faulty control modules such as the ECM or BCM.

  • Total: $300 - $1200
  • Success rate: 90%
Money-Saving Tips for U05E9
  • 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 U05E9 Diagnosis Process

Follow these systematic steps to accurately diagnose U05E9. 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: 2016 Ford F-150 Communication Issue

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

Problem: Customer reported intermittent loss of power and ABS warning light.

Diagnosis: After scanning with GeekOBD APP, U05E9 was identified along with other codes. A visual inspection revealed corroded wiring.

Solution: Replaced damaged wiring and connectors, cleared codes, and performed a system function test.

Cost: $250 (including parts and labor)

Result: Vehicle returned to normal operation with no further issues.

Case Study 2: 2018 Chrysler 300 Module Replacement

Vehicle: 2018 Chrysler 300, 30,000 miles

Problem: Customer noticed the engine light was on and experienced erratic electrical behavior.

Diagnosis: Diagnosis with GeekOBD APP showed U05E9 along with a failing BCM.

Solution: Replaced the Body Control Module and updated software.

Cost: $900 (including parts and labor)

Result: All systems functioned correctly post-repair, and the customer reported satisfaction.

Diagnose U05E9

Use GeekOBD APP for professional diagnosis!

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

Code Information

Code: U05E9
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes