U1300 Code: Meaning, Causes, and Symptoms | OBD2 Codes

U1300 – Low Voltage On Class 2 Serial Data Circuit


U1300 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


U1300 Possible Causes


Repair other code first


U1300 Description


Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. In addition to this, Node Alive messages are transmitted by each module on the class 2 serial data circuit about once every 2 seconds. When the module detects one of the following conditions on the class 2 serial data circuit for approximately 3 seconds, the setting of all other class 2 serial communication DTCs is inhibited and a DTC will set.