2001 Pontiac Grand Prix 01 Grand Prix transmission shift so

Tiny
BUZNJES
  • MEMBER
  • 2001 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 75,000 MILES
Went to get my car inspected today and it failed because of an engine code the guy told me was caused by a faulty transmission shift solenoid. The last few weeks, I had randomly experienced hard shifting and/or starting in 2nd gear when accelerating from a dead stop. I'm assuming the shift solenoid is the reason for this.

What's involved in replacing the transmission shift solenoid/s?
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Friday, December 11th, 2009 AT 11:30 AM

5 Replies

Tiny
MATHIASO
  • MEMBER
Hello buznjes

To better serve you, if you have the code written down, post it to me; I will greatly appreciate to help.
Thank you for using 2carpros. Com
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Tuesday, December 15th, 2009 AT 11:00 AM
Tiny
BUZNJES
  • MEMBER
I do not have the code. I didn't think to ask what the code # was because I was still in shock from him telling me I would need to spend a ton of money to fix the transmission just to get my car inspected.
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Tuesday, December 15th, 2009 AT 11:18 AM
Tiny
MATHIASO
  • MEMBER
What is involved in replacing shift solenoid was the question asked in your first post.
I wish to have the code so I could be more specific but I can give you guide line about what is involve.
Your transmission is a 4T65-E

The answer will vary depending on mechanical skills and your tool supply! Because this is a front wheel drive transmission and the arrangement of the internals you cannot simply drop the bottom pan and access any of the solenoids or the valve body. In order to gain access to the solenoids and / or the valve body you must lower the transmission out the bottom of the vehicle. You will need to have some sort of engine support device, as the engine must be held up because you will be dropping down or removing the support cradle under the front of the vehicle, which contains engine and transmission mounts that support the drive train.. You have to remove the side cover of the transmission to gain access to the solenoids and valve body. Often times you can reuse the side covert gasket, but if it is damaged you will need to replace this item and it is a dealer only part that is pretty costly, so be careful with the original! Before you remove the side cover you will need to drain the transmission fluid. You will also need to remove the drivers side axle, unless you plan to just leave it hang from the axle but often there is not enough room to do this because of suspension components. Once the side cover is off you will have full access to inspect / replace the solenoids, pressure switch manifold, and pump/valve body assembly if needed. This is something that can be done with patience and the right tools and a good mechanical aptitude. Though an experienced trans shop or a tech can do this in roughly 4-8 hours I would plan a full day or two worth of down time. Even if everything comes apart smooth you can run into other problems along the way or find more problems than originally sought out. I hope this helps in the understanding of what is involved in fixing problem related internal transmission parts.

Hope this help.
Thank you foe using 2carpros.
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Tuesday, December 15th, 2009 AT 12:06 PM
Tiny
BUZNJES
  • MEMBER
Thanks for the information. I recently stripped down the engine in my wife's Montero Sport to pull the heads (runs perfectly now), so I'm confident in my abilities to disassemble, replace, and reassemble.

I have 2 floor jacks and a set of jack stands, so I think I'm covered from a lift and support standpoint.

Minus the spindle nut, I think I've got the necessary wrenches and sockets. What size is the spindle nut? Also, there are any special/unique tools required?
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Tuesday, December 22nd, 2009 AT 11:33 AM
Tiny
MATHIASO
  • MEMBER
Hello buznjes

the size is 2 1/2 in. Hex

you recently stripped down the engine on Montero Sport, I suppose you have the basic tools you need.
Remember to label anything you disconnect or remove, to make installation more easier.

# 1

The first job is to lower the transmission out of the bottom of the vehicle.
When this first task is done, I will direct you to the next step.

Drain the transmission fluid.

Install an engine support fixture.

Remove or disconnect the following:
Negative battery cable

Throttle body air inlet duct

Engine mount struts

Wire harness connectors from the transmission

Range selector cable from the Park Neutral Position (PNP) switch

Range selector cable and bracket

PNP switch

Power steering gear to frame retaining bolts

Fluid filler tube

Upper transmission bolts

Wire harness grounds

Both front wheels

Engine splash shields

Both tie rod ends from the steering knuckles

Power steering gear from the frame and secure it to the body of the vehicle

Power steering cooler line clamps

Engine mount lower nuts

Lower ball joints from the steering knuckles

Torque converter cover

Starter motor

Torque converter bolts

Oil cooler hoses

Drive axles and secure them to the steering knuckles

Wheel Speed Sensor (WSS) electrical connectors

Vehicle Speed Sensor (VSS) electrical connectors

Use a transmission table to support the transmission.
Engine mount lower nuts

Transmission brace

Lower transmission bolts

Frame-to-body bolts

Separate the transmission from the engine.

Lower the transmission and frame from the vehicle
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Tuesday, December 22nd, 2009 AT 12:39 PM

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