2021-2023 Nissan TCU Reset After Collision Notification

Nissan has issued Technical Service Bulletin (TSB) NTB20-085B to address an issue where the Telematics Control Unit (TCU) may become disabled after the vehicle is involved in an accident and performs an automatic collision notification. This condition prevents the automatic collision notification function from working until the TCU is reset. This TSB provides the necessary steps for technicians to perform a Nissan TCU reset B2E1B-97 to restore full functionality.

Symptoms

Owners may notice that the automatic collision notification system is no longer active after an incident. While there might not be a direct dashboard warning for the owner, the vehicle's diagnostic system will store a specific fault code indicating the issue, signaling the need for a Nissan TCU reset B2E1B-97.

Fault Codes / DTCs

When the automatic collision notification function is disabled, the Telematics Control Unit (TCU) may store the following Diagnostic Trouble Code (DTC):

Code	Description	Module
B2E1B-97	"Automatic eCAll locked"	TCU

This DTC will typically be displayed as "CURRENT" when the function is disabled, indicating an active fault that requires attention.

Diagnosis / Trigger Conditions

The primary trigger condition for this issue is the performance of an automatic collision notification by the vehicle's Telematics Control Unit (TCU) following an accident. Once this notification occurs, the TCU's eCAll function becomes locked, disabling its ability to send further automatic collision notifications. The presence of the "Automatic eCAll locked" status or DTC B2E1B-97 confirms the need for a Nissan TCU reset B2E1B-97.

Repair Procedure Summary

The repair involves using the Nissan CONSULT-III plus diagnostic tool to reset the Telematics Control Unit (TCU) and clear any stored Diagnostic Trouble Codes (DTCs). The general steps for technicians are as follows:

1. Preparation: Before beginning, technicians must ensure that the ASIST software on the CONSULT PC is synchronized to the current date and all CONSULT software updates have been installed.
2. Connect Diagnostic Tool: Confirm the CONSULT PC is connected to Wi-Fi. Connect the Vehicle Interface (VI) to the vehicle and start the CONSULT-III plus software.
3. Login: If prompted, select "USA/CANADA Dealers" from the drop-down menu and then select "OK". Log in using NNAnet credentials. If not prompted for login, ensure the CONSULT PC is connected to Wi-Fi, close C-III plus, and reopen it.
4. VI Recognition: Wait for the VI to be recognized; its serial number will display on the screen, as shown in Figure 1 of the bulletin.
5. Select Diagnosis: From the main menu, select "Diagnosis (One System)".
6. Select IVC: On the System Selection screen (Figure 2), select "IVC" (Intelligent Vehicle Control).
7. Access Work Support: Under the IVC menu, select "Work support" (Figure 3).
8. Initiate Reset: Select "Automatic report prevention release" and then click "Start".
9. Check Status: If "LOCK” is displayed next to "Current status" (Figure 4), select "Start" to unlock the automatic report prevention. If "UNLOCK” is displayed (Figure 5), the TCU does not need to be reset, and the technician can proceed to select "End".
10. Finalize: Select "End" once the status is confirmed or the reset is complete.
11. Erase DTCs: Perform an "Erase All DTCs" to clear the stored B2E1B-97 code and ensure the system is fully reset.

Important Warnings

Nissan explicitly states that these bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians possess the proper training, equipment, tools, safety instructions, and know-how to perform the job correctly and safely. Owners should not attempt this procedure themselves. If you believe this condition applies to your vehicle, do not assume it does; instead, see your authorized Nissan dealer to confirm applicability.

Bulletin History

This bulletin, NTB20-085B, is the latest revision. It supersedes previous versions:

• NTB20-085: Original bulletin published on November 30, 2020.
• NTB20-085A: Published on April 21, 2022, with updates to "APPLIED VEHICLES", "SERVICE INFORMATION", and Figure 5, and the addition of step 11.
• NTB20-085B: Published on January 23, 2023, with revisions to the classification number, "APPLIED VEHICLES", and login steps moved to page 2.

NHTSA ID: 10231423