U1024 Code: Meaning, Causes, and Symptoms | OBD2 Codes

U1024 – VVEL CAN communication


U1024 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


U1024 Possible Causes


Faulty Variable Valve Event & Lift (VVEL) Control Module,VVEL Control Module harness is open or shorted,VVEL Control Module circuit poor electrical connection,Faulty Engine Control Module (ECM)


U1024 Description


CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Engine Control Module (ECM) and Variable Valve Event & Lift (VVEL) control module are connected with two communication lines (CAN H line and CAN L line) and transmit/receive data. ECM shares information and links with the VVEL control module during operation.