AutoCodes – Lexus – B15EC Lexus

B15EC Lexus Code - Backup Battery Degradation

Quick Answer

This Diagnostic Trouble Code (DTC) is set when the Data Communication Module (DCM) (Telematics Transceiver) detects either of the following conditions: The Back-Up Battery (BUB) charge level becomes less than the criteria, Automatic Collision Notification (ACN) occurred. Common causes include Faulty Back-Up Battery (BUB), Back-Up Battery (BUB) harness is open or shorted, Back-Up Battery (BUB) 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: B15EC Lexus indicates Backup Battery Degradation.
Common causes: Common causes include Faulty Back-Up Battery (BUB), Back-Up Battery (BUB) harness is open or shorted, Back-Up Battery (BUB) 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.

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Code Popularity 19,811

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 21, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B15EC Lexus Description

OBDII Code B15EC Lexus - Backup Battery Degradation - AutoCodes.com — B15EC Lexus Code - Backup Battery Degradation

What does this mean?

What are the Possible Causes of the DTC B15EC Lexus?

Faulty Back-Up Battery (BUB)
Back-Up Battery (BUB) harness is open or shorted
Back-Up Battery (BUB) circuit poor electrical connection

How to Fix the DTC B15EC 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 B15EC 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.

Need more information about the B15EC Lexus code?

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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 B15EC Lexus Code

1. What does the OBDII code B15EC on a Lexus indicate?

The B15EC code on a Lexus relates to backup battery degradation within the vehicle's system.

2. What are the common symptoms of backup battery degradation in a Lexus?

Common symptoms include issues with starting the vehicle, malfunctioning electrical components, and warning lights appearing on the dashboard.

3. What causes backup battery degradation in a Lexus?

Backup battery degradation can be caused by the natural aging of the battery, extended periods of inactivity, or electrical system malfunctions.

4. How can I diagnose backup battery degradation in my Lexus?

To diagnose backup battery degradation, you can use an OBDII scanner to read the B15EC code and inspect the condition of the backup battery itself.

5. Can backup battery degradation affect the performance of my Lexus?

Yes, backup battery degradation can affect the performance of your Lexus by causing electrical malfunctions and potentially preventing the vehicle from starting.

6. How can I repair backup battery degradation in my Lexus?

Repairing backup battery degradation typically involves replacing the backup battery with a new one to restore proper functionality.

7. Are there any preventive measures to avoid backup battery degradation in a Lexus?

To prevent backup battery degradation, it is recommended to regularly drive the vehicle to keep the battery charged, avoid leaving electrical components on when the engine is off, and replace the backup battery as needed.

8. Is it safe to continue driving my Lexus with the B15EC code present?

While it may be safe to drive with the B15EC code present, it is recommended to address the backup battery degradation issue promptly to avoid potential electrical system failures.

9. Can I reset the B15EC code on my Lexus without replacing the backup battery?

Resetting the B15EC code without addressing the backup battery degradation issue is not recommended, as the code will likely reappear until the underlying problem is fixed.

10. How much does it typically cost to repair backup battery degradation in a Lexus?

The cost of repairing backup battery degradation in a Lexus can vary depending on the model of the vehicle and the specific components that need to be replaced, but it generally ranges from $100 to $300 for parts and labor.