Possible causes

– Faulty Transmission Control Module (TCM)
– Transmission Control Module (TCM) harness is open or shorted
– Transmission Control Module (TCM) circuit poor electrical connection

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1703 INFINITI Description

The Transmission Control Module (TCM) consists of a microcomputer and connectors for signal input and output and for power supply. The TCM controls the A/T.

INFINITI Technical Service Bulletins for P1703 code