· Super Moderator
EPB is the Electronic Parking Brake - could be related or not. Since it started happening after the engine bay wash/detail, would assume that water got somewhere it shouldn't have. Definatley look at wiring harness connectors going to the transmission. Trace wiring back from the transmission to wherever it originates from (presumably in the engine bay near the ECM) and examine connectors for water intrusion or corrosion there as well.