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B278C Lexus Code - Lost Communication With Power Source Control

Quick Answer

The B278C diagnostic trouble code for Lexus vehicles indicates that there is a communication error between the Power Source Control module and other modules within the vehicle's network. Common causes include Loose or corroded wiring connections, Faulty Power Source Control module, Communication bus malfunction. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B278C Lexus indicates Lost Communication With Power Source Control.
Common causes
Common causes include Loose or corroded wiring connections, Faulty Power Source Control module, Communication bus malfunction.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code B278C Lexus Description

The B278C diagnostic trouble code for Lexus vehicles indicates that there is a communication error between the Power Source Control module and other modules within the vehicle's network. The Power Source Control module is responsible for managing the power distribution throughout the vehicle and ensuring that all electrical components receive the appropriate voltage. When communication is lost with this module, it can lead to various electrical issues that can affect the vehicle's performance and functionality.

OBDII Code B278C Lexus - Lost Communication With Power Source Control
B278C Lexus Code - Lost Communication With Power Source Control

Common Causes of B278C Lexus

  1. Loose or corroded wiring connections
  2. Faulty Power Source Control module
  3. Communication bus malfunction
  4. Software glitch in one of the modules
  5. Water damage to electrical components

Symptoms of B278C Lexus

  1. Engine starting issues
  2. Erratic behavior of electrical components
  3. Battery not charging properly
  4. Warning lights illuminated on the dashboard
  5. Vehicle stalling or running rough

How to Fix B278C Lexus

  1. Perform a thorough inspection of the wiring connections and repair any loose or corroded connections.
  2. Test the Power Source Control module for proper functionality and replace if necessary.
  3. Check the communication bus for any faults and repair as needed.
  4. Update the software in the affected modules to address any glitches.
  5. Ensure all electrical components are functioning correctly after repairs are completed.

Cost to Fix B278C Lexus

The typical repair costs for addressing a lost communication issue with the Power Source Control module in a Lexus vehicle can range from $200 to $600, depending on the exact cause of the problem and the cost of replacement parts. It's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. Factors such as location, vehicle make and model, and engine type can also influence the final repair costs. It's recommended to consult with a qualified mechanic to get a more accurate estimate based on your specific situation.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B278C Lexus Code

1. What are common symptoms of OBDII code B278C in a Lexus indicating a lost communication with power source control?

The common symptoms include dashboard warning lights, issues with power windows, door locks, and other electrical components, as well as possible starting problems.

2. What are some potential causes of OBDII code B278C in a Lexus?

Possible causes include a faulty power source control module, damaged wiring or connectors, a drained battery, or a software glitch.

3. How can I diagnose the issue related to OBDII code B278C in my Lexus?

You can start by checking the power source control module, inspecting the wiring and connectors for any damage, ensuring the battery is fully charged, and using a diagnostic scanner to read and clear the code.

4. What are some repair tips for fixing OBDII code B278C in a Lexus?

Try resetting the power source control module by disconnecting the battery for a few minutes, inspecting and repairing any damaged wiring or connectors, or seeking professional help if needed.

5. Can I drive my Lexus with OBDII code B278C?

It is not recommended to drive your Lexus with this code active, as it can lead to potential electrical malfunctions or starting issues while on the road.

6. How much does it typically cost to repair OBDII code B278C in a Lexus?

The cost of repairing this code can vary depending on the specific cause of the issue, but it may range from a simple fix like reconnecting a loose wire to a more complex repair involving the power source control module.

7. Is it possible to prevent OBDII code B278C from occurring in my Lexus?

Regular maintenance, such as checking the battery health and keeping an eye on electrical components, can help prevent this code from occurring in your Lexus.

8. Does OBDII code B278C affect the overall performance of my Lexus?

While the code itself may not directly affect performance, it can lead to issues with various electrical systems in your Lexus, impacting overall functionality.

9. How urgent is it to address OBDII code B278C in my Lexus?

It is recommended to address this code promptly to avoid potential electrical failures or starting problems in your Lexus.

10. Can a DIY enthusiast fix OBDII code B278C in a Lexus?

Depending on the cause of the issue, some DIY enthusiasts may be able to fix this code themselves by following repair guides or seeking assistance from online forums and resources.

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