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Home >> Infiniti >> 2017 >> QX80 Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 120 (Security Control System (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> DTC B2603: Shift Position Status Signal Fault >> DTC Logic >> DTC Detection Logic

DTC Detection Logic

WARNING: This page is about a different car, the 2016 Infiniti QX80. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • If DTC B2603 is displayed with DTC B2601, first perform the trouble diagnosis for DTC B2601. Refer to DTC LOGIC .
DTC No. Trouble diagnosis name DTC detecting condition Possible causes
B2603 SHIFT POSI STATUS BCM detects the following status when ignition switch is in the ON position.
  • P position signal from TCM: approx. 0 V
  • A/T shift selector (detention switch) signal: approx. 0 V
  • Harness or connector

    [A/T shift selector (detention switch) circuit is open or shorted.]

  • Harness or connectors

    (TCM circuit is open or shorted.)

  • A/T shift selector (detention switch)
  • A/T assembly (TCM)
  • BCM
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