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P161D on the 2019 Nissan Altima

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.

Bulletins for this model year that name P161D
NTB19-008C2022-02-10. Service bulletin. NISSAN; DIAGNOSIS INFORMATION FOR DTC P161D This bulletin is no longer active. Please discard previous versions of NTB19-008.
NTB19-008b2021-03-06. Service bulletin. NISSAN; DIAGNOSIS INFORMATION FOR DTC P161D This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
NTB19-008a2019-05-20. Service bulletin. NISSAN; DIAGNOSIS INFORMATION FOR DTC P161D This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
NTB19-0082019-02-19. Service bulletin. NISSAN; DIAGNOSIS INFORMATION FOR DTC P161D SERVICE INFORMATION When key registration is unsuccessful after BCM replacement, P161D (Immobilizer) will set when the ignition is turned on. Possible causes - Improper key registration - Defective BCM (Vehicles with Intelligent Key only) - EPS control unit (Vehicles with mechanical key only) - Intelligent Key unit (Vehicles with mechanical key only) Trouble Diagnosis NOTE: If DTC B2196-52 is stored with P161D, perform the diagnosis procedure for DTC B2196-52 first. - Before replacing the BCM, confirm that the keys were programmed correctly by ensuring the vehicle will start and that the lock/unlock buttons function normally. - If any keys do not function normally, re-register all of the keys. - After re-registering all of the keys, reconfirm each key's function. - If OK, erase the code to complete the repair. - If NG, diagnose the Key, BCM and/or EPS control unit per the ESM.

4 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.