Throwing PO1757 (Transmission), and P0320 codes? Electrical problems... -
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Go Back > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Throwing PO1757 (Transmission), and P0320 codes? Electrical problems...

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Unread 08-15-2014, 01:16 PM   #1
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Join Date: Nov 2008
Location: New York
Posts: 32
Throwing PO1757 (Transmission), and P0320 codes? Electrical problems...

1998 Laredo with the 4.0L

I have had constant electrical problems with the car for the past few years. A bunch of false codes and stalling issues which were then fixed for a while when I brought it to a dealership two years ago and they replaced the entire computer.

Last year I had a couple codes (don't remmember what they were exactly) for the tranny solenoid/governor pressure sensor. I replaced both with Mopar replacements(also did the filter/fluid at this time) and the codes were gone and vehicle drove fine.

Had some wandering idle/surging issues at highway speeds (it feels like at highway speeds the torque convertor is locking/unlocking causing the RPMS to jump up a couple hundred rpms for a second) come back late last year, brought it to a dealership, and they said it was a bad IAC/TPS (TPS had been replaced like a year earlier). I replaced both of these with MOPAR equivalents. Problem did not get any better originally then magically after just driving for a couple weeks all the problems went away.

During this summer the surging at highway speeds came back. I have just learned to live with it. But now it is throwing the code P1757 and P0320. Any ideas on where to start? From researching it looks like the 320 code is a bad crankshaft sensor. While that has been replaced before I am just going to replace it with a MOPAR equivalent (and a camshaft sensor while I am at it). What is the P1757 and how do I fix that? (like I said I already did the sensor/solenoid in the tranny thing.

Any tips/hints would be appreciated.

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Unread 08-15-2014, 10:25 PM   #2
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1997 ZJ 
Join Date: Oct 2011
Location: Evansville, IN
Posts: 568
1757 is gov pressure sensor... specifically "Governor Pressure Above 3 psi at 0 MPH"

one of the following is happening

1 the sensor you put in is already going bad
2 gremlins/random fluke code
3 something is seriously wrong with the transmission

common symptoms of a P1757 affect the shifting... high shifts, erratic shift behavior, transmission going into limp mode
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Unread 08-17-2014, 06:32 PM   #3
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Join Date: Nov 2008
Location: New York
Posts: 32
Of course after I posted this the engine light went off and everything has been fine (its not even doing the rpm surge thing on the highway).

The weather has changed and it has been cooler the past few days. Interestingly enough this problem started when it was getting warm this summer (it did not do it in winter).

Any idea on why the temperature would affect it like this?
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