Leaderboard

I recall at least one time I had a similar experience as SnowStorm. From the manual, the Power Steering Control Module (PSCM) needs the power mode signal from the Body Control Module for Electronic Power Assist Steering (EPAS) to be activated. So, any delay or error in getting the signal might be the cause of the few second delay in EPAS activation. Once active, EPAS uses the steering torque sensor input and vehicle speed in applying steering assist. "The steering torque sensor senses the torque at the steering wheel. It is hard wired to the PSCM and works by measuring the relative rotation between an input and output shaft which are connected by a torsion bar." "The PSCM is self-monitoring and is capable of setting and storing Diagnostic Trouble Codes (DTCs). Depending on the DTC set, the PSCM may enter a failure mode. In addition, the PSCM may send a request to the IPC to display a message in the message center, alerting the driver of a potential EPAS concern." Depending on the DTC, the PSCM failure modes are 1) diminished EPAS and 2) no EPAS or manual steering. So, my guess is that upon restart the issue causing the failure mode was no longer present and EPAS operation returned to normal and the DTC was reset. It seems that a CAN issue, PSCM issue, or an issue with the steering torque sensor could initiate a failure mode.