Question about 1999 Jeep Grand Cherokee

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I have a 1999 jeep grand cherkoee 4.7 v8 with transmission shifting prolbems it gives me a code of po871 solenoid pressure switch can you tell me how hard then are to change and what else it could be.I have done but both input and output speed sensor in it

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  • howell-john Jul 17, 2010

    yes thank you very much



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The speed sensors you replaced where most likely accessed from the outside of the Transmission. The solenoid the current fault is referencing for the most part is no harder to replace but Identifying which one it is will actually be the problem. There are most likely 3 to 4 switches inside the transmission and the fault could be any of them. You maybe able to identify them with a Haynes repair manual on the vehicle. Some of the manuals do show these while others do not. You would have to check the manual on your vehicle to know if it does or not. Typically there are only 2 to 3 Torx head screws that hold them in place so they are pretty easy to change once you get the Transmission pan off.

Posted on Jul 16, 2010


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1 Answer

2002 jeep grand cherokee overland code po871 tranny problem

code p 0871 refers to transmission fluid pressure (TFP) sensor C ---range /performance problem ==== causes --wiring ---poor connections ---TFP sensor ---ECM---TCM
code p 0841 refers to TFP sensor A same problems and same causes
if the connections are clean and tight and the wiring is in good condition , you change out both sensors and check the transmission control module (TCM) for operation

Aug 29, 2017 | Jeep Cars & Trucks

1 Answer

Tengo un 2004 jeep grand cherokee que ensenna el codigo po871 cual pude ser el problema?..

english works better,

but P0871

wild guess. missing in my real FSM.

OD Pressure Switch harness is open or shorted

- OD Pressure Switch circuit poor electrical connection

- Faulty OD Pressure Switch

- Internal transmission damage

- Faulty Powertrain Control Module (PCM)

- Faulty Transmission Control Module (TCM)

or read real jeep post

like here.

Sep 30, 2015 | Jeep Cars & Trucks

1 Answer

I have to error code with my jeep grand Cherokee Laredo 1999 the code are 1491,1495,753,136

P1491 Rad Fan Control Relay Circuit An open or shorted condition detected in the radiator fan control relay control circuit. This includes PWM solid state relays.P1495 Leak Detection Pump Solenoid Circuit An open or shorted condition detected in the Leak Detection Pump (LDP) solenoid circuit.P0753 (M) Trans 3-4 Shift Sol/Trans Relay Circuits An open or shorted condition detected in the overdrive solenoid control circuit or Trans Relay Circuit in JTEC RE transmissions. Was MIL code 45. P0753 (M) Trans 3-4 Shift Sol/Trans Relay Circuits An open or shorted condition detected in the transmission 2-4 shift solenoid circuit (4-speed auto. trans. only).P0136 (M) 1/2 O2 Sensor Heater Circuit Malfunction Oxygen sensor heater element malfunction.

Aside from getting into an accident and having your wiring harness severely damaged, the other likely suspect is your PCM. These codes are not related to each other and indicate a much larger problem.

Nov 02, 2013 | 1999 Jeep Grand Cherokee

1 Answer

Recently the transmission is Stuck in 3rd

P1768 - Performance / Normal / Winter Mode Input Malfunction

P1733 - 3-4 Shift Malfunction
I would suggest you have the shift solenoid electrically tested to determine if they are at fault here or that you have a wiring issue or a failed Transmission control module. You will need the help of a transmission shop to diagnose this properly, do not just replace parts until you are sure they are the problem.

Jun 18, 2012 | Jeep Grand Cherokee Cars & Trucks

1 Answer

2002 Jeep Grand Cherokee Limited P0846 code

Trouble Code: P0846

A/T 2/4 Pressure Switch Circuit Malfunction
Possible Causes:

2/4 pressure is incorrect, or internal transmission faults exist 2/4 pressure switch circuit is open, shorted to ground or power 2/4 pressure switch is damaged or it has failed TCM relay power circuit to L/R switch is open (loss of B+) PCM/TCM has failed

May 16, 2012 | 2000 Jeep Grand Cherokee

1 Answer

How do I change shifting cylinoid A in the trans of my 2000 jeep grand cherokee?

If you have the 4.0 engine the "shift solenoid" is for overdrive and also one for tcc ingagement.There is however a govenor pressure solenoid and sensor that will affect shifting.If you have a v-8 engine then you have a solenoid block that contains all 6 solenoids for the transmission in one package and is mounted on the top of valve body inside the transmission.If you can tell me what the diagnostic codes and symptoms are I may can help you fix it without buying expensive parts you dont need.

Apr 13, 2011 | 2000 Jeep Grand Cherokee

1 Answer

My jeep g choro.lorado check eng. code is 3,4 shift.need location of the solenoid tha controls this or causes the light to illuminate.

It is in the transmission bolted to the valve body. You have to remove the bottom pan to get at the solenoid. The 3-4 shift solenoid and the Torque converter clutch solenoid and built together on the same bracket.

Jun 29, 2010 | 1999 Jeep Grand Cherokee

2 Answers

I have a 1999 Jeep Cherokee with 4 wheel drive, when I start out the transmission takes a long time to shift into high gear, probably around 4o to 50 MPH. Someone said it is the transmission modual and has...

This is possible, to check the valve by going under your jeep and looking at the back part of the transmission. You will see a valve with a vacuum line going to it, it is usually located at rear of trans just above trans pan. To check pull vacuum line off, if fluid comes out the valve is bad and needs to be replaced. They can be purchased at most auto parts stores readily. If no fluid the trans may just need serviced.

Oct 04, 2009 | 1999 Jeep Grand Cherokee

2 Answers


Typo and model:
1.- 4-speed automatic AW-30-40 (6cil start of 1993)
2.- 4-speed automatic 42RE ( 6cil 1993)
3.- 4-speed automatic 46RH ( V8, 1993-1995)
4.- 4-speed automatic 44RE ( 5.2L V8, 1996)
5.- 4-speed automatic 46RE ( 5.9L V8, 1998)
6.- 5-speed automatic 45RFE( 4.7L V8, 1999 in WJ)

Enter the VIN in here:

Also cHeck this info:

Good luck!!!

Dec 05, 2008 | 1993 Jeep Grand Cherokee

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