DTC P06B8-00: NVRAM Malfunction (TCM): Outline

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

DTC P06B8:00 (TCM, EV6A-EL, EV6AX-EL) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	NVRAM malfunction
Detection condition	Under the following condition, TCM internal NVRAM data retention/read/write disabled: Battery voltage is 8 V or more.
Fail-safe	Not applicable
Possible cause	TCM initial learning error Control valve body malfunction TCM internal NVRAM malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable