DTC P0705 Transmission Range Sensor Circuit Malfunction (PRNDL Input); DTC P0850 Park / Neutral Switch Input Circuit: Description

WARNING: This page is about a different car, the 2007 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.

The park/neutral position switch detects the shift lever position and sends signals to the ECM.

DTC DETECTION CONDITION AND TROUBLE AREA

DTC No.	DTC Detection Condition	Trouble Area
P0705	Any 2 or more signals of the following are ON simultaneously (2-trip detection logic) P input signal is ON. N input signal is ON. R input signal is ON. D input signal is ON. When any of following conditions is met for 2.0 sec. or more in the S position (2-trip detection logic) P input signal is ON. N input signal is ON. R input signal is ON. All switches are OFF simultaneously for P, R, N and D positions (2-trip detection logic)	Open or short in park/neutral position switch circuit Park/neutral position switch ECM
P0850	Park/neutral position switch remains ON (P, N position) during driving under conditions (a) and (b) for 30 sec. (2-trip detection logic) Vehicle speed: 44 mph (70 km/h) or more Engine speed: 1,000 to 2,500 rpm	Short in park/neutral position switch circuit Park/neutral position switch ECM