P17FA – Ratio Monitoring Shift 3-1

P17FA Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P17FA Possible Causes

Transmission Mechanical Problems,Faulty Transmission Assembly

P17FA Description

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