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Code p1784-lr pressure switch sense circuit for a 99 lhs how to repair?

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I need to know what is p1784 and how to fix it.

P1784 low reverse pressure switch sensor circuit.
Check fluid level and condition in the transmission and then check electrical connections. You may have to take it to a transmission shop.

Feb 22, 2017 | Jeep Cars & Trucks

1 Answer

Error p1784

This code is for the LR pressure switch sens circuit. The switch is part of the TRS/solenoid block inside the transmission. (I presume at least that you have the 5-45RFE transmission with the 4.7L). The problem could be wiring or TCM, but mostly its the pressure switch itself and need a new solenoid assy.

Nov 19, 2013 | 2003 Jeep Grand Cherokee Limited

2 Answers

What this code is p-1784

This is a transmission fault code. Diagnosing it will require the DRB3 scan tool, or equivalent aftermarket scanner, and the transmission simulator tool.
Remove the VB(valve body) and the solenoid pack is easy to change and a shift kit comes with a non stick switch valve.In most of the cases is faulty solenoid pack causing this eror code.But there are other possibilities to.

When Monitored and Set Condition:

When Monitored: Whenever the engine is running.

Set Condition: The appropriate code is set if one of the pressure switches are open or closed at the wrong time in a given gear.


Feb 23, 2011 | 2000 Jeep Grand Cherokee

1 Answer

Trouble code p1784 on dodge grand caravan

found this on another page.....
Originally Posted by vasau viewpost.gif The vehicle came in with 2 trouble codes and complaint on a transmission shifting.
P1775 Solenoid Switch Valve Stuck in TCC.
P1784 LR Pressure Switch Circuit.
After clearing these 2 codes the van ran normal for about 20 minutes without any issue, but after, the problems came back with no codes.
LR Pressure Switch is always in "Open" position. Must be closed at Park, Rev and Neutral.
Could anyone explain to me how the switch works. Is this the solenoid pack or the LR Pressure issue?The L/R pressure switch should be closed in P/N only. The switch should open when put into REV if the trans is not in limp-in mode. All switches will stay CLOSED if the trans is in limp-in mode. Disconnect the trans 8-way connector at the solenoid pack. Key on scanner hooked up apply 12 volts to the L/R pressure switch pin in the 8-way connector and watch for the switch to change from open to closed. If it does change the SSV may be stuck in the TCC position. You will have to remove the valvebody and inspect the solenoid switch valve to know for sure. The pressure switch itself is in the solenoid pack. If you have an old solenoid pack changing it is easier and quicker than inspecting the valvebody. Perform your diag for fault P1784. I believe the pressure switch is also closed in 1st gear also. Hope this helps.

Jan 17, 2011 | 1996 Plymouth Grand Voyager

1 Answer

Po731 p1784 p1787 po760

incorrect gear ratio,first gear
pressure switch circuit :LR
hydraulic pressure switch:OD
shift solenoid C malfuction

Sep 08, 2010 | 1996 Dodge Intrepid

2 Answers

Code p1784 is pressure switch circuit:LR How to

you'll need to have a transmission shop check the wiring harness in the transmission first ,then they can repair it,this is not a job to be doing yourself,

Jan 26, 2010 | 2000 Dodge Dakota Quad Cab

1 Answer

2000 dodge dakota auto trans.When cold it will shift from 1st to 3rd.I can turn off engine.then re-start.It's fine then.The code is p1784.What do you think?

P1784=Pressure switch circuit: LR,
this is a switch in the transmission,the code is being erased with the cycling of the key,

Jan 26, 2010 | 2000 Dodge Dakota Quad Cab

2 Answers

2001 Jeep Grand Cheroke with code p1784. How to fix?

Pressure switch circuit: LR,
this in the tranny

Jan 09, 2010 | 2001 Jeep Grand Cherokee

1 Answer

"Where do I find the pressure switch circuit: LR"

There is a row of plugs beaneath the solenoid pack. One of those is a rev pressure port. If reverse is gone, I am betting on a broken internal part.

Apr 06, 2009 | 1996 Dodge Caravan

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