U0665 - DTC U0665 - Understanding and Fixing U0665 in 2015-2018 Honda Accord and Other Models

Quick Answer

U0665 means: U0665 indicates a communication failure between the body control module and other vehicle modules.

Fix: Check and replace faulty components Cost: $300 - $800 Time: 90-180 minutes

Can I drive with U0665? Immediate attention is recommended to prevent further electrical issues.

Common Questions

What does U0665 mean and how does it affect my car?

The U0665 code signifies a communication error between the body control module and other vehicle systems. This can affect various electronic functions in your car, such as lights and locks. If left unaddressed, these issues can escalate, leading to further operational problems.

What are the most common causes of U0665 and how much does it cost to fix?

The most common cause is a faulty BCM, accounting for about 40% of cases. Repair costs can vary; replacing the BCM may cost between $300 to $800, while wiring repairs could range from $100 to $300.

Can I drive my car with U0665 or should I stop immediately?

Driving with a U0665 code is not advisable, as it can lead to further electrical issues. It’s best to have your vehicle inspected as soon as possible to avoid complications.

How can I diagnose U0665 myself using GeekOBD APP?

You can use the GeekOBD APP to scan your vehicle for codes, including U0665. Follow the prompts to retrieve detailed information and freeze frame data, helping you pinpoint the issue more accurately.

What vehicles are most commonly affected by U0665?

Commonly affected vehicles include the 2015-2018 Honda Accord, 2016-2018 Toyota Camry, and 2014-2019 Ford Fusion, among others. Keep an eye out for any recalls related to BCM issues for these models.

How can I prevent U0665 from happening again?

Regular maintenance checks, especially for electrical systems and connections, can help prevent U0665. Ensure proper sealing to avoid water intrusion and keep an eye on software updates for your vehicle.

What is U0665?

DTC U0665 is a diagnostic trouble code that indicates a problem with the communication line between the vehicle's control modules, specifically related to the body control module (BCM). This code often arises in models like the 2015-2018 Honda Accord, Toyota Camry, and Ford Fusion, where multiple modules work together to manage various functions such as lighting, locking, and climate control. When U0665 is triggered, it means that the BCM is not receiving or sending signals correctly to other modules, which can lead to a range of operational issues. For car owners, this could result in symptoms like malfunctioning lights, non-responsive locks, or abnormal behavior of the climate control system. Ignoring this code can lead to further complications, as the modules may fail to communicate effectively, leading to more significant electrical problems over time. Proper diagnosis and repair are crucial to restore normal function and ensure that all electronic systems operate seamlessly. Understanding the implications of U0665 can help you take timely action, preventing more severe issues down the line.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0665 is present:

The 'Check Engine' light stays on constantly, indicating a persistent issue with the vehicle's electronic systems.
Power locks may fail to operate correctly, leading to difficulties in securing the vehicle, which can be frustrating and time-consuming.
The vehicle's interior lights may not function as expected, either staying on or failing to illuminate when doors are opened.
The climate control system may exhibit erratic behavior, such as sudden temperature changes or failure to respond to adjustments made by the driver.
In some cases, the dashboard display may malfunction, showing incorrect information or flickering intermittently.

Possible Causes

Most common causes of U0665 (ordered by frequency):

{'cause': 'Faulty body control module (BCM) - Likelihood: 40%', 'details': 'A malfunctioning BCM can prevent proper communication with other modules, often due to internal failures or software issues.'}
{'cause': 'Damaged wiring or connectors - Likelihood: 30%', 'details': 'Corrosion, frayed wires, or loose connections can disrupt signal transmission and lead to communication errors.'}
{'cause': 'Software glitches - Likelihood: 20%', 'details': 'Sometimes, the problem can arise from outdated or corrupted software in the BCM, which can be resolved with a software update.'}
{'cause': 'Poor grounding - Likelihood: 5%', 'details': 'Inadequate grounding points can lead to electrical noise and communication failures between modules.'}
{'cause': 'Water intrusion - Likelihood: 5%', 'details': 'Water damage from leaks can affect the BCM or wiring, leading to failures in communication.'}

U0665 Repair Costs

Cost Breakdown by Repair Type

BCM Replacement

Replacing the faulty body control module with a new unit.

Total: $300 - $800
Success rate: 85%

Wiring Repair

Repairing or replacing damaged wiring and connectors.

Total: $100 - $300
Success rate: 75%

Software Update

Updating the BCM software to fix glitches.

Total: $50 - $150
Success rate: 60%

Money-Saving Tips for U0665

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 U0665 Diagnosis Process

Follow these systematic steps to accurately diagnose U0665. 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).