2021-2023 Nissan Key Not Detected, Engine Will Not Start

Nissan Technical Service Bulletin (TSB) NTB13-107F, released on April 27, 2023, addresses a common problem where the vehicle key is not detected or authenticated, leading to the engine not starting. This bulletin applies to all 2021-2023 Nissan vehicles equipped with either an Intelligent Key or a Nissan Anti-Theft System (NATS) key.

This bulletin has been amended multiple times, superseding previous versions NTB13-107, NTB13-107A, NTB13-107B, NTB13-107C, NTB13-107D, and NTB13-107E. The latest revision includes updated applied vehicles and revised supplemental diagnosis information for Intelligent Key systems.

Symptoms

Owners may experience various symptoms, typically intermittent, indicating that the key signal is being interfered with. The specific symptoms depend on whether the vehicle uses an Intelligent Key or a NATS key system.

If there is interference with Intelligent Key signals, you may observe:

• The Intelligent Key is not detected, causing the engine to not start when the Stop/Start button is pressed.
• The instrument cluster displays messages such as "Incorrect Key ID" or "No I-Key Detected".
• Intermittent operation of the buttons on the remote (key fob).
• Intermittent operation of the door request switches.

If there is interference with NATS Key signals, you may observe:

• The NATS key is not detected, causing the engine to not start when the key is turned.
• Illumination of the "Immobilizer warning light" on the instrument cluster (as shown in Figure 2 of the original bulletin).

Fault Codes / DTCs

For vehicles with NATS Key systems, interference can also lead to diagnostic trouble codes (DTCs) being stored in the vehicle's control modules.

Code	Description	Module
B2191	Difference of key	BCM
P1615	Difference of key	ECM

Diagnosis / Trigger Conditions

The primary cause of the Nissan Sentra key not detected issue is radio frequency (RF) interference from other wireless devices. These devices transmit signals that can interfere with the vehicle's ability to receive and authenticate the key's signal. Common sources of interference include:

• Other wireless devices: Aftermarket alarm systems, radar detectors, or any other electronic devices in close proximity to the vehicle key.
• RFID tokens: An RFID (Radio Frequency Identification) token, such as those found on keychains (Figure 3 in the bulletin), can interfere if placed too close to the vehicle key.
• Other keys: Keys with a similar transponder frequency or multiple keys on a single keyring can cause interference.
• Intelligent Key placement: The Intelligent Key's RF signal can be obstructed if stored near metal objects or in purses/backpacks with RFID-blocking material.
• Personal electronic devices: Phones, other Intelligent Keys, highway PASS cards, USB chargers, and PC chargers can transmit similar RF signals that interfere with key authentication.
• Environmental factors: RF signals from the vehicle's surroundings, such as radar detectors or aftermarket alarm systems in other vehicles, or even surrounding buildings, can also cause interference.

Repair Procedure Summary

The diagnostic process for the Nissan Sentra key not detected problem focuses on identifying and eliminating sources of RF interference rather than replacing parts. Technicians are advised to:

1. Check Intelligent Key fob battery: Use the Signal Tech II IKEY Battery Test to confirm the battery's state of charge.
2. Inspect key location: Ensure the Intelligent Key is not stored in a location where its RF signal can be obstructed by metal objects or RFID-blocking materials.
3. Remove interfering devices: Temporarily remove all aftermarket devices from the vehicle, including other keys on the keyring, during diagnosis.
4. Assess personal devices: Confirm the Intelligent Key is not near personal electronic devices that could be transmitting similar RF signals.
5. Note vehicle location: If the concern cannot be duplicated, it's important to determine where the vehicle was located when the customer experienced the no-start condition, as external RF signals can be a factor.

Important Warnings

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. If you believe a described condition may apply to your vehicle, DO NOT assume that it does. See your Nissan dealer to determine if this applies to your vehicle.

What Owners Should Know

If your 2021-2023 Nissan Sentra or other applicable model is experiencing a "Key Not Detected" or "Engine Will Not Start" issue, it's crucial to have it diagnosed by a qualified Nissan technician. Avoid replacing parts yourself, as the problem is often related to external interference rather than a faulty component. Your dealer can perform the necessary diagnostic steps outlined in TSB NTB13-107F to identify the source of the interference.

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Source: NHTSA ID: 10235707