B278C Lexus Code - Lost Communication With Power Source Control
Quick Answer
This Diagnostic Trouble Code (DTC) is stored when Local Interconnect Network (LIN) communication between the Certification ECU (Smart Key ECU Assembly) and Power Management Control ECU stops for 10 seconds or more. Common causes include Faulty Power Management Control ECU, Power Management Control ECU harness is open or shorted, Power Management Control ECU circuit poor electrical connection. 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 Faulty Power Management Control ECU, Power Management Control ECU harness is open or shorted, Power Management Control ECU circuit poor electrical connection.
- 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.
Code B278C Lexus Description
What are the Possible Causes of the DTC B278C Lexus?
- Faulty Power Management Control ECU
- Power Management Control ECU harness is open or shorted
- Power Management Control ECU circuit poor electrical connection
- Faulty Certification ECU (Smart Key ECU Assembly)
How to Fix the DTC B278C Lexus?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B278C Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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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