P0999 – Shift Solenoid ‘F’ Control Circuit High

P0999 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P0999 Possible Causes

Faulty Shift Solenoid ‘F’,Shift Solenoid ‘F’ harness is open or shorted,Shift Solenoid ‘F’ circuit poor electrical connection

P0999 Description

The Transmission Control Module (TCM) monitors the Shift Solenoid signal. The TCM sets the OBDII code when the Shift Solenoid is not to factory specifications.