Transmission codes P1781 and P1784?

Tiny
SACFOX189
  • MEMBER
  • 1999 CHRYSLER 300M
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I installed shift solenoid pack put it back together and put the same fluid. Test run. Then put back on OBD P1781 was the result.
Friday, October 14th, 2022 AT 4:15 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

The code is specific to the OD pressure switch sensor circuit. What that means is the pressure switch is open or closed at the wrong time in a given gear or shift.

There are multiple things that can cause this code to set (see the last pic below). Most commonly, it is the pressure switch itself. However, the only way to confirm is to perform the diagnostics related to the code.

I attached the diagnostics below for your review. Take a look through them and let me know if it is something you feel comfortable doing.

Take care

Joe

See pics below.
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Sunday, October 16th, 2022 AT 9:08 PM
Tiny
SACFOX189
  • MEMBER
  • 4 POSTS
So just replace valve body and it should solve it because I don't know where anything located on transmission.
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Monday, October 17th, 2022 AT 8:53 AM

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