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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 502 (Engine Control System (DTC/Circuit Diagnosis) (1 Of 3)) >> DTC/Circuit Diagnosis >> DTC P0128: Thermostat Function >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ENGINE COOLANT TEMPERATURE SENSOR 

    Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Replace engine coolant temperature sensor.

  2. CHECK THERMOSTAT 

    Check thermostat. Refer to Removal and Installation .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace thermostat.

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