DTC U0300:00, U0300:01, U0300:02 [MZI-3.7]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

DTC U0300:00	Internal control module software incompatibility
DTC U0300:01	Internal control module software incompatibility (general electrical failure)
DTC U0300:02	Internal control module software incompatibility (general signal failure)
DETECTION CONDITION	This DTC indicates there are incompatible software levels within the PCM that control the drive-by wire control system. The drive-by wire control 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.
POSSIBLE CAUSE	PCM calibration level