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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 523 (Automatic Transmission (Re7R01B) (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> DTC P1721: Vehicle Speed Signal >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD and 2019 Nissan NV2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OF UNIFIED METER AND A/C AMP. 

    SYMBOL With CONSULT

    Perform "Self Diagnostic Results" in "METER/M&A".

    Is any DTC detected?

    YES

    Check DTC detected item. Refer to DTC Index .

    NO

    GO TO 2.

  2. CHECK DTC OF TCM 

    SYMBOL With CONSULT

    Perform "Self Diagnostic Results" in "TRANSMISSION".

    Is any DTC other than "P1721" detected?

    YES

    • Check DTC detected item.

      Refer to DTC Index .

    NO

    Replace the control valve & TCM. Refer to Removal and Installation .