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B278C Toyota Code - Lost Communication With Power Source Control

Quick Answer

The B278C diagnostic trouble code for Toyota vehicles indicates that there is a communication failure between the Power Source Control (PSC) module and the vehicle's onboard computer system. Common causes include Faulty wiring or connectors, Malfunctioning Power Source Control module, Communication error within the vehicle's network. 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 Toyota indicates Lost Communication With Power Source Control.
Common causes
Common causes include Faulty wiring or connectors, Malfunctioning Power Source Control module, Communication error within the vehicle's network.
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 Toyota Description

The B278C diagnostic trouble code for Toyota vehicles indicates that there is a communication failure between the Power Source Control (PSC) module and the vehicle's onboard computer system. The Power Source Control module is responsible for managing the power distribution within the vehicle, ensuring that all electrical components receive the necessary power supply. When communication is lost with this module, it can lead to various issues affecting the vehicle's performance and functionality.

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

Common Causes of B278C Toyota

  1. Faulty wiring or connectors
  2. Malfunctioning Power Source Control module
  3. Communication error within the vehicle's network
  4. Corrosion or damage to electrical connections
  5. Software issues in the vehicle's onboard computer system

Symptoms of B278C Toyota

  1. Dashboard warning lights illuminated
  2. Erratic behavior of electrical components
  3. Engine stalling or rough idling
  4. Poor acceleration
  5. Complete power loss in extreme cases

How to Fix B278C Toyota

  1. Perform a thorough inspection of the wiring and connectors related to the Power Source Control module.
  2. Check for any corrosion or damage to electrical connections and repair or replace as necessary.
  3. Test the Power Source Control module for proper functioning and replace if found to be faulty.
  4. Diagnose and address any communication errors within the vehicle's network.
  5. Clear the diagnostic trouble codes from the vehicle's computer system and perform a test drive to ensure the issue has been resolved.

Cost to Fix B278C Toyota

The typical repair costs for addressing the B278C code can vary depending on the specific cause of the communication failure. In general, the parts and labor involved in diagnosing and repairing this issue can range from $200 to $500. However, it's important to note that the actual cost may be higher or lower based on factors such as the location of the repair shop, the vehicle's make and model, and the extent of the repair needed. It's recommended to consult with a qualified mechanic or dealership to obtain a more accurate estimate based on your individual circumstances. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates may vary.

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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 Toyota Code

1. What are the common symptoms of OBDII code B278C (Lost Communication With Power Source Control) in a Toyota?

The common symptoms include loss of power steering assist, illuminated dashboard warning lights, and intermittent or complete power steering failure.

2. What are the possible causes of OBDII code B278C in a Toyota?

Possible causes include a faulty power steering control module, wiring or connection issues, blown fuses, or a malfunctioning power steering motor.

3. How can I diagnose the source of the communication failure with the power source control in my Toyota?

Performing a thorough inspection of the power steering system, checking for loose or damaged wiring, and using a diagnostic scan tool to retrieve codes and data can help pinpoint the issue.

4. Can OBDII code B278C be triggered by a dead or weak battery in a Toyota?

Yes, a dead or weak battery can sometimes trigger this code due to inadequate power supply to the power steering control module.

5. What are some repair tips for addressing OBDII code B278C in a Toyota?

Inspect and repair any damaged wiring or connections, replace blown fuses, ensure the battery is in good condition, and consider resetting the power steering system after making repairs.

6. Is it safe to continue driving my Toyota with the B278C code present?

It is not recommended to drive the vehicle with this code present, as it can lead to sudden loss of power steering assist, making the vehicle difficult to steer and potentially unsafe to drive.

7. Can a DIY enthusiast without advanced automotive knowledge fix the B278C code in a Toyota?

While some basic troubleshooting steps can be taken, diagnosing and repairing issues related to this code may require specialized tools and expertise, so seeking professional help is advised.

8. How much does it typically cost to repair OBDII code B278C in a Toyota?

The cost of repairs can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Will resetting the OBDII code B278C in a Toyota make the problem go away permanently?

Simply resetting the code without addressing the underlying issue will not fix the problem permanently. It is important to diagnose and repair the root cause to prevent the code from reappearing.

10. Can extreme weather conditions or rough road conditions trigger the B278C code in a Toyota?

Extreme weather conditions or rough road conditions can potentially exacerbate existing issues in the power steering system, leading to the triggering of the B278C code.

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