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DTC Detection Logic

WARNING: This page is about a different car, the 2012 Infiniti QX56. 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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