02Ku

Check Engine Light came on and the error is p1780. I think i know what this means but where is this switch located so i can check it. Other than the switch itself can something else be wrong.

Thx

tfeni52355

O2Ku,
Seems the PNP switch is the Park Neutral Position switch which is used to sense the position of the shifter. Sometimes these switches may stick or if the car was started/stopped with the shifter in an "in between" position the computer may have seen it as a malfucntion.

I would suggest clearing the code and seeing if it comes back. If it comes back have the switch replaced. Most times these swicthes are on the side of the transmission.

User902748

I had similar problem. When the car was driving the reverse gear would show. This resulted in the p1780 check engine code. This was on my 2000 Lexus Es300.

The major problem is/are broken wires in the trunk on the left (driver side). Look where the wires enter the trunk (the door). The wires get bent there most often resulting in broken wires.

Attached are pictures where my problem was.

djitchy

Did this fix the problem? because i had the same code come on yesterday, and fixed one wire in the same location because my reverse lights wasnt working and my transmission was shifting into reverse to rough also