Nissan Altima B2192 P1611 ID Discord IMMU ECM

Both Article 1 and Article 2 shed light on Nissan DTC B2192, a diagnostic trouble code related to ID discord and IMMU-ECM in Nissan vehicles. Let’s explore the details and diagnostic procedures mentioned in both articles to gain a comprehensive understanding of the issue.

DTC B2192: Definition and Causes

B2192 Code Overview

The B2192 code signifies a problem in the ID verification process between the Body Control Module (BCM) and Engine Control Module (ECM) in Nissan vehicles.

Possible Causes

  • Faulty or unprogrammed ignition key
  • Malfunctioning Immobilizer (IMMU)
  • ECM-related issues

Symptoms and Tech Description

Tech Description

The code is triggered when an unregistered or damaged key is used for starting the engine multiple times consecutively, resulting in a system lock.


  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine fails to start

Nissan Vehicle Immobilizer System (NVIS) Overview

Immobilizer Function

  • An electronic device preventing the engine from running without the correct key
  • Key’s microcircuit activated by an electromagnetic field, generating a unique binary code read by the ECM
  • Components: NATS ignition key, NATS antenna amp, BCM or IMMU, ECM, Security indicator lamp

Article 2: Nissan Altima 2007-2012 Service Manual Insights

DTC Logic and Confirmation Procedure

DTC Logic

  • BCM verifies ID with ECM for engine start
  • ECM prevents engine start if ID is unregistered
  • Communication initiated by BCM when the ignition switch is ON

Confirmation Procedure

  1. Turn ignition ON (P or N position, no brake pedal depression)
  2. Check “Self diagnostic result” with CONSULT-III
  3. If DTC detected, refer to Diagnosis Procedure

Diagnosis Procedure and Initialization

Diagnosis Procedure

  • If DTC detected, perform initialization with CONSULT-III
  • Re-register all Intelligent Keys
  • Check if the system can be initialized and the engine started with re-registered key
  • If successful, ID was unregistered; if not, consider BCM or ECM replacement

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