P1546 – Manufacturer-Specific Fault Code (Nissan)

Description

P1546 is a manufacturer-specific Nissan fault code whose meaning can vary by vehicle, engine and control system. On some Nissan/Infiniti applications it is related to the sub-battery temperature sensor circuit, while on certain diesel engines it is used for excessive exhaust or particulate-filter temperature. Always identify the exact vehicle, engine and Nissan service definition before diagnosing P1546 or replacing components.

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Symptoms

  • Check Engine Light may be on
  • Stop/start system may be disabled on applicable vehicles
  • DPF regeneration may be inhibited on applicable diesel engines
  • Additional battery-sensor or DPF-related fault codes may be stored
  • Vehicle symptoms depend on the engine and system using the P1546 code

Causes

  • Cause depends on the Nissan model and engine
  • Sub-battery temperature sensor or related circuit fault on applicable vehicles
  • Damaged wiring or connectors in the battery sensor circuit
  • Excessive particulate-filter temperature on applicable diesel engines
  • DPF or exhaust-temperature related fault on applicable diesel engines
  • Related fault codes affecting the monitored system

Diagnosis

  • Confirm the exact Nissan model, model year and engine
  • Check the manufacturer-specific definition of P1546 for that application
  • Read and record all stored and pending fault codes
  • Review freeze-frame data and related system faults
  • If P1546 is defined as a battery temperature sensor fault, inspect the sensor circuit, wiring and connector
  • If P1546 is defined as an exhaust or DPF temperature fault, diagnose related DPF, temperature-sensor and engine-management codes first
  • Use Nissan-specific service information before replacing components

Repair

  • Repair wiring or connector faults confirmed during testing
  • Repair the applicable battery temperature sensor circuit when P1546 is defined for that system
  • Diagnose and repair DPF or exhaust-temperature faults on applicable diesel engines
  • Repair related faults that Nissan service information identifies as higher priority
  • Replace sensors or other components only after testing confirms the fault
  • Clear the code and verify that P1546 does not return

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