P1605 – Automatic Transmission Communication

P1605 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1605 Possible Causes

Weak battery,Faulty Transmission Control Module (TCM),Harness is open or shorted between TCM and Engine Control Module (ECM),Poor circuit electrical connection between TCM and ECM

P1605 Description

The malfunction information related to Automatic Transmission is transferred through the line circuit from Transmission control module (TCM) to Engine Control Module (ECM).