2021-2023 Nissan Vehicles DTC B2E01-96 Internal Battery

Nissan has released Technical Service Bulletin (TSB) NTB22-027A to address a specific diagnostic trouble code (DTC), Nissan TCU B2E01-96, which indicates an internal battery issue within the Telematics Communication Unit (TCU). This bulletin applies to a range of 2021-2023 Nissan vehicles and provides a detailed procedure for authorized dealerships to diagnose and resolve the fault.

The TSB, which supersedes the original bulletin NTB22-027 published on April 12, 2022, ensures that technicians can effectively clear the "CRNT" (Current/Active) status of the DTC, restoring proper functionality to the vehicle's telematics system.

Symptoms

The primary symptom addressed by this TSB is the presence of DTC B2E01-96 (Internal battery) stored as "CRNT" (Current/Active) within the Intelligent Vehicle Communication (IVC) module. While this code may not trigger a direct dashboard warning light for the owner, it indicates a potential issue with the internal power supply of the Telematics Communication Unit.

Fault Codes / DTCs

The specific diagnostic trouble code related to this issue is:

• B2E01-96: Internal battery (stored as "CRNT" in IVC)

What the Telematics Communication Unit (TCU) Does

The Telematics Communication Unit (TCU) is a vital component in affected Nissan vehicles, especially those equipped with a factory-installed SOS switch located near the overhead map lamp. This wireless communication device enables NissanConnect® Services, providing various security and convenience features by communicating with the Nissan Data Center. The internal battery within the TCU is essential for maintaining its continuous operation and ensuring these services function correctly.

Important Warnings for Technicians

Nissan emphasizes several critical warnings for technicians performing this procedure to prevent damage to the TCU and ensure a successful repair:

• "Nissan Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are properly trained individuals who have the equipment, tools, safety instruction, and know-how to do a job properly and safely. NOTE: If you believe that a described condition may apply to a particular vehicle, DO NOT assume that it does. See your Nissan dealer to determine if this applies to your vehicle."
• "Connect a battery maintainer or smart charger set to reflash mode or a similar setting. If the vehicle battery voltage drops below 12.0V or rises above 15.5V during reprogramming, the TCU may be damaged."
• "Be sure to turn OFF all vehicle electrical loads. If a vehicle electrical load remains ON, the TCU may be damaged."
• "Be sure to connect the AC Adapter. If the CONSULT PC battery voltage drops during reprogramming, the process will be interrupted and the TCU may be damaged."
• "Turn OFF all external Bluetooth® devices (e.g., cell phones, printers, etc.) within range of the CONSULT PC and the VI. If Bluetooth® signal waves are within range of the CONSULT PC or VI during reprogramming, reprogramming may be interrupted and the TCU may be damaged."
• "HINT: Diagnosis and repair of DTCs other than B2E01-96 are not covered by this bulletin."
• "If B2E01-96 Internal battery will not change to “PAST”, refer to the ESM for further diagnostic information."
• "If B2E01-96 Internal battery returns as “CRNT” or will not ERASE, refer to the ESM for further diagnostic information."

Diagnosis and Repair Procedure Summary

The repair process for the Nissan TCU B2E01-96 fault involves using the Nissan CONSULT-III diagnostic system. Technicians must first ensure their CONSULT PC software is fully updated (ASIST synchronization) and connected to Wi-Fi. After connecting the Vehicle Interface (VI) to the vehicle and starting CONSULT-III, they will select "Diagnosis (All Systems)" and confirm the vehicle's VIN.

The diagnostic tool is then used to verify that the B2E01-96 DTC is present as "CRNT" in the IVC. If any other DTCs are also active, they must be addressed before proceeding with this specific repair. The core of the repair involves navigating to the "Work support" menu within CONSULT-III and selecting "TCU Backup Battery Reset". The technician will initiate this reset and monitor the status, ensuring it transitions from "Waiting" to "Completed". Once the reset is complete, they will access "Self Diagnostic Result" to confirm that the B2E01-96 DTC has changed to "PAST" (meaning it's no longer current) and then proceed to "ERASE" the code. A final check is performed to ensure the Nissan TCU B2E01-96 does not return.

Required Tools and Software

To perform the diagnosis and repair for the Nissan TCU B2E01-96 issue, technicians require specific tools and software:

• Nissan CONSULT-III diagnostic system: This includes the CONSULT PC and the Vehicle Interface (VI).
• ASIST software: Must be synchronized and updated to the current date.
• Battery maintainer or smart charger: Essential for maintaining vehicle battery voltage between 12.0V and 15.5V during the reprogramming process to prevent TCU damage.
• AC Adapter: Required for the CONSULT PC to ensure stable power during the procedure.

Owner Action

If you own a 2021-2023 Nissan vehicle listed in the affected models and suspect an issue with your NissanConnect® Services or have had your vehicle diagnosed with Nissan TCU B2E01-96, it is recommended to contact an authorized Nissan dealership. They possess the specialized tools, software, and training required to accurately diagnose and perform the "TCU Backup Battery Reset" procedure outlined in TSB NTB22-027A. This service ensures the proper functioning of your vehicle's telematics system.

NHTSA ID: 10231426