p0850 code 2012 ms3

[silas]

just got this code says park/neutral switch input circuit and a pcm code. only mods i have is the cobb AP and corksport intake. Where should i start?

 

[Ssinstaller]

At the neutral position switch in the transmission.

 

[Awafrican]

Also check the connection & harness going to the transmission

 

[Ssinstaller]

The wire to test is in pin 1s(it's voilet)at the ECM. Should have 12v when the transmission is in any gear, and drop to ground in neutral.

 

[silas]

At the neutral position switch in the transmission.

where is the switch located?

 

[Ssinstaller]

The switch is on the transmission.