DTC Detection Logic

WARNING: This page is about a different car, the 2020 Nissan Armada. 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 Description .

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