DTC P0989: Transmission Fluid Pressure Sensor / Switch "E" Circuit Low; DTC P0990: Transmission Fluid Pressure Sensor / Switch "E" Circuit High: Description

WARNING: This page is about a different car, the 2013 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

ATF pressure switch No. 3 is installed in the lock-up solenoid ATF output passage and is used to detect a malfunction in the lock-up solenoid.

DTC No.	DTC Detection Condition	Trouble Area
P0989	Transmission fluid pressure switch No. 3 is OFF when lock-up occurs in response to a lock-up request (2 trip detection logic).	ATF temperature sensor assembly (ATF pressure switch No. 3) Transmission wire TCM
P0990	When both of the following are detected (2 trip detection logic): Transmission fluid pressure switch No. 3 is ON when lock-up does not occur. Lock-up does not occur when shift solenoid valve (SLU) is requested to turn off in the lock-up range.