P1DDD FIAT – Transmission Control Module Monitoring Processor Performance Unable To Disengage Drive Or Reverse

P1DDD FIAT Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1DDD FIAT Possible Causes

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

P1DDD FIAT Description

The purpose of the diagnostic is to detect a failure in the activation of the pressure regulators during gear disengagement or while NEUTRAL or PARK position is engaged. This is a rationality check between the activated pressure regulators and the shifter selected gear.