U0300 Code: Meaning, Causes, and Symptoms | OBD2 Codes

U0300 – Internal Control Module Software Incompatibility


U0300 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


U0300 Possible Causes


Reprogram Module (“Flashing”),New Powertrain Control Module (PCM) Needs programming


U0300 Description


The U0300 code indicates there are incompatible software levels within the Powertrain Control Module (PCM) that control the Electronic Throttle Control (ETC) system. The ETC system uses multiple microprocessors within the PCM, each having its own software level and function. The microprocessors must have the correct level of software in order to communicate and function together.