DTC P0989: Transmission Fluid Pressure Sensor / Switch "E" Circuit Low; DTC P0990: Transmission Fluid Pressure Sensor / Switch "E" Circuit High [12/2013 - 11/2016]: Description

WARNING: This page is about a different car, the 2016 Toyota Highlander, 2015 Toyota Highlander, and 2014 Toyota Highlander. 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.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0989	Transmission Fluid Pressure Sensor / Switch "E" Circuit Low	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	Comes on	DTC stored
P0990	Transmission Fluid Pressure Sensor / Switch "E" Circuit High	When both of the following conditions 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.	ATF temperature sensor assembly (ATF pressure switch No. 3) Transmission wire TCM	Comes on	DTC stored