U0B74 - DTC U0B74 - Understanding the Communication Error in 2015-2018 Honda Accord and More

Quick Answer

U0B74 means: The U0B74 code indicates a communication error within the vehicle's control modules.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with U0B74? It is recommended to diagnose and resolve this issue as soon as possible to avoid further complications.

Common Questions

What does U0B74 mean and how does it affect my car?

The U0B74 code indicates a communication error within your vehicle's control modules, which can lead to malfunctioning systems. If left unresolved, it may impact safety features and overall vehicle performance.

What are the most common causes of U0B74 and how much does it cost to fix?

Common causes include damaged wiring (40% likelihood) and malfunctioning control modules (30%). Repair costs can range from $100 for wiring fixes to over $1,200 for module replacements.

Can I drive my car with U0B74 or should I stop immediately?

While some drivers may continue to operate their vehicle, it is advisable to address the U0B74 code promptly to prevent potential safety issues or further damage.

How can I diagnose U0B74 myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for all trouble codes and view freeze frame data. This can help you pinpoint when the issue occurs and gather context for further investigation.

What vehicles are most commonly affected by U0B74?

The U0B74 code is frequently seen in models like the 2015-2018 Honda Accord. Other vehicles from various manufacturers can also encounter this code due to similar electronic architectures.

How can I prevent U0B74 from happening again?

Regular maintenance, including checking wiring and connections, can help prevent communication errors. Additionally, avoid installing aftermarket accessories that may interfere with the vehicle's electronic systems.

What is U0B74?

The diagnostic trouble code (DTC) U0B74 indicates a communication error related to the 'Vehicle Control Module (VCM)' or a specific communication network failure. This code is primarily found in vehicles like the 2015-2018 Honda Accord, but can also appear in various models from other manufacturers. When the vehicle's onboard computer detects that a particular module or sensor is not communicating as expected, it triggers this code. This might happen due to damaged wiring, faulty connectors, or an actual malfunction in the module itself. The implications of U0B74 can range from minor inconveniences, such as the malfunction of certain features (like infotainment systems), to more severe issues that could affect vehicle safety and performance. Ignoring this code could lead to progressive failures in related systems, potentially leaving you stranded or resulting in costly repairs later. Vehicle owners experiencing this code should address it promptly to ensure ongoing functionality and safety.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0B74 is present:

The 'Check Engine' light or 'Service Vehicle' indicator remains illuminated, signaling potential issues.
The vehicle may experience erratic behavior, such as the infotainment system freezing or malfunctioning during operation.
Drivers may notice dashboard warning lights for various systems, which can lead to confusion over the vehicle's actual operational status.
In some cases, the vehicle may have difficulty starting or could exhibit stalling, particularly if a critical module is affected.
Fuel efficiency may decrease unexpectedly, indicating that the engine control module is not functioning optimally.

Possible Causes

Most common causes of U0B74 (ordered by frequency):

The most common cause of the U0B74 code, accounting for about 40% of cases, is damaged wiring or connectors in the communication network. This can happen due to wear and tear or exposure to environmental factors.
Another frequent cause, seen in around 30% of instances, is a malfunctioning Vehicle Control Module (VCM). A software glitch or internal failure can prevent the module from sending or receiving data correctly.
A less common cause, occurring in about 20% of cases, is interference from aftermarket accessories, such as alarms or stereo systems that can disrupt communication.
In rare scenarios, such as 5% of cases, a failed power supply to the control module could lead to this code, often resulting from blown fuses or battery issues.
Lastly, a rare but serious cause (approximately 5% likelihood) is a failure in the communication bus itself, which would require thorough testing and potentially replacing the entire system.

U0B74 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repairing damaged wiring or connectors in the communication network.

Total: $100 - $300
Success rate: 85%

Control Module Replacement

Replacing a faulty Vehicle Control Module (VCM) if necessary.

Total: $600 - $1200
Success rate: 90%

Software Update

Updating the control module software to eliminate glitches.

Total: $50 - $150
Success rate: 75%

Money-Saving Tips for U0B74

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 U0B74 Diagnosis Process

Follow these systematic steps to accurately diagnose U0B74. 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). Look closely at connectors related to the VCM.