DTC P0C2B-11: Auxiliary Transmission Fluid Pump Control Module Feedback Signal Circuit Short to Ground [12/2021 - 10/2023]: Description

The oil pump of the automatic transmission assembly stops operating when the engine is stopped by stop and start control. While the engine is stopped by stop and start control, the oil pump with motor assembly is operated continuously ensuring optimal automatic transmission oil pressure and smooth start-off when the engine is restarted.

The engine stop and start ECU supplies power to the oil pump with motor assembly via terminal OP21 and operates the oil pump with motor assembly in accordance with signals sent from terminal OPM1. The oil pump with motor assembly sends operating speed signals to the engine stop and start ECU via the NOPM signal line.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	DTC Output from	Priority	Note
P0C2B-11	Auxiliary Transmission Fluid Pump Control Module Feedback Signal Circuit Short to Ground	Both of the following conditions are met for 2 seconds or more (2 trip detection logic): Oil pump motor relay circuit in the engine stop and start ECU is off Oil pump with motor assembly power supply malfunction (Oil pump motor relay circuit in the engine stop and start ECU stuck on or shorted) or a short to ground in the NOPM circuit	Wire harness or connector Oil pump with motor assembly Engine stop and start ECU	Blinks	Stop and Start	A	SAE Code: P0C2D