DTC P0877-00: Oil Pressure Switch No. 4 (Oil Pressure Switch B) Stuck On (TCM) (Us): 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 P0877:00 (TCM, EV6A-EL, EV6AX-EL, US) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Oil pressure switch No. 4 (Oil pressure switch B) stuck on
Detection condition	Under the following conditions, oil pressure switch No. 4 stuck-on detected by combination of gear ratio malfunction and oil pressure switch pattern malfunction: Engine is running. ATF temperature is 20°C {68°F} or more. There is no correlation between vehicle speed signal from DSC HU/CM and output shaft speed sensor signal. Turbine/input shaft speed sensor and output shaft speed sensor DTC is not recorded.
Fail-safe	Inhibits learning control. Inhibits manual mode. Inhibits neutral idle control. Inhibits AAS.
Possible cause	Oil pressure switch No. 4 malfunction TCM malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable