Question about 1997 Oldsmobile Bravada

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No reverse movement after valve body was removed and cleaned

I removed and cleaned the valve body on my 97 Olds Bravada transmission. Now I don't have reverse. I also can not move the vehicle in the reverse direction even in neutral when the vehicle is not running. The vehicle will move forward in drive, however, I am not moving too far being it is in the driveway and I don't have much room to move. But it does move forward. When I put it in reverse when it is running, I can tell it is in gear just not moving. It is like trying to move with the parking brake on. I am thinking this is something mechanical because I can not move the vehicle when it is not running and in neutral.It will roll forward in neutral but backwards. It is move about 1 inch back and stop like it is in park. Any suggestions? It has me baffled. I have taken this apart 3 times trying to figure it out. I have done this disassembly and cleaning and reassembling about a year ago and everything went fine. I didn't do anything different this time, but now have this problem. I am a mechanic just never did tranny work.

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  • paul swallow May 11, 2010

    why did u take the valve body out?

    what was the problembefore u pulled it apart?



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Stupid question here, but did you put the valve body in backwards or upside down? Ensure all the connectors, lines are good....outside of that how about the gear selector? I have done alot of tranny work myself, but some of these things are common mishaps that I have done myself. Good luck to you and let us know what you come up with. Thanks for using Fixya!



Posted on Dec 10, 2008


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Posted on Jan 02, 2017

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SOURCE: 1998 olds bravada tranny

AWD should not be effected, but sounds like you do have problems.

Posted on Jan 09, 2009

  • 41 Answers

SOURCE: 1998 olds Bravada, runs great in the driveway,

Bad TPS will give you a SES light. Possible low fuel pressure from bad fuel pump. Put a fuel pressure gauge on the service port close to the firewall, should stay above 50 psi when juicing the gas. Only use OEM parts on a Bravada! Try "thepartsladi" store on eBay.

Posted on Feb 06, 2010

  • 1 Answer

SOURCE: my 1999 olds bravada has no reverse is that a

I had the same thing happen ended up replacing the whole transmission with a GM rebuilt trans. It had all the updates installed and so far no more problems worth it for me.

Posted on Mar 06, 2011

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Service engine light is on the p0741 code poped up on 2002 grand prix se

Hi there:DTC P0741 - Torque Converter Clutch (TCC) Excessive Slip, Transaxle Chuggle, Slip/Surge (Inspect and/or Replace Various Internal Transaxle Components

There is some service info, that may very well be your problem. here is the info...

Subject: Incorrect Transmission Shifts, Poor Engine Performance, Harsh 1-2 Upshifts, Slips 1ST and Reverse, Torque Converter Clutch (TCC) Stuck Off/On, DTCs P0730, P0756, P0757, P0741, P0742 (Clean Transaxle Valve Body and Case Oil Passages of Debris)

Models: 2001-2005 GM Passenger Cars with 4T65-E Automatic Transmission
2001-2005 Buick Rendezvous
2005 Buick Terraza
2001-2004 Chevrolet Venture
2005 Chevrolet Uplander
2001-2004 Oldsmobile Silhouette
2001-2005 Pontiac Aztek, Montana
2005 Saturn Relay
with 4T65-E Transmission (RPOs M15, MN3, MN7, M76)

Some owners may comment on any one or more of the following conditions:

* The SES lamp is illuminated.
* The transmission slips.
* The transmission does not shift correctly, is very difficult to get the vehicle to start moving or the engine lacks the power to move the vehicle.
* Poor engine performance.

The most likely cause of the various conditions may be chips or debris:
* All years--Pressure Reg. Valve (Bore 1) or Torque Signal Valve (Bore 4) stuck.
* On 2001-2002 vehicles, a plugged orifice on the case side of the spacer plate.
* On 2003-2005 vehicles, restricted movement of the 2-3 shift valves in the valve body.
* On 2003-2005 vehicles, restricted movement of the 3-4 shift valves in the valve body.

Technician Diagnosis and Correction
* The technician's road test reveals the vehicle launches in third or fourth gear (high RPM with slow vehicle acceleration).

* On 2001-2002 vehicles, a DTC P0756 or P0757 may be stored.
* On 2003-2005 vehicles, a DTC P0730, P0741, P0748 or P0757 may be stored.
* Refer to the appropriate Service Information (SI) for additional Diagnostic Assistance.
* With a Tech 2 connected to the vehicle, road test the vehicle and perform the following steps:
If the above symptoms are present proceed with the following steps.
With the valve body removed and on a workbench, carefully push the valve against spring pressure to check if the valve will snap back to the original position. Or for the valves seated in home position, use a small flat-bladed screwdriver and carefully pry the valve off its seat, quickly remove the screwdriver allowing the valve to return to its seat. If the valve does not snap back unencumbered, then the valve will need to be removed from the valve body.
Once the valve is removed, inspect for any scratching or scoring.
If any scratching or scoring is found, then the fingernail test will need to be performed.

Important: It has been found that in most cases that the scratches are not severe enough to catch your fingernail.
Using your fingernail, move over any scratches to see if your nail will catch on the scratch or score.
* If your nail catches in the scratches, the valve will need to be replaced.
* If your nail does not catch in the scratches, continue with the next step.

Important: Clean the valve body with the machined side down so debris may escape.
Clean the valve and bore using brake cleaner.
Blow off with shop air.
To verify free movement of the valve, dip the valve into clean ATF and install the valve back into the appropriate bore. The valve should move freely. If the valve moves freely, in most cases the valve body will function properly when reinstalled.
Reassemble and retest .


(1)Bore 1, Pressure Regulator (Reverse Boost Valve inside bushing)(2)Bore 2, 1-2 Shift Valve, Solenoid "A"(4)Bore 4, Torque Signal Valve, Pressure Control Solenoid(5)Bore 5, Pressure Relief Valve(6)Bore 6, PWM and TCC Control Valve(7)Bore 7, TCC Regulator Apply Valve(11) Bore 11, 3-4 Shift Valve, 4-3 Manual Down Shift Valve(12) Bore 12, 2-3 Shift Valve, 3-2 Manual Down Shift Valve(14) Bore 14, Secondary 1-2 Accumulator Valve(15) Bore 15, 2-3 Accumulator Valve, 3-4 Accumulator Valve(16) Bore 16, Solenoid "B"

Hope this helps.

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There are TSB's for this issue. I chased this issue for months on mine. Go find the TSB's, there's troubleshooting pointing out the faulty part. It could be, the brake light switch, the hazzard light switch itself, the multi-function switch. I had replaced all of these and still had the problem. Wiring that goes from the brake switch to up near the fender was shorting against the fender. I replaced the pigtail, problem fixed. Best bet to help you, is find the TSB's for this problem.

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1 Answer


Transmission is not junk. You need to replace the valve body with a rebuilt one. The cause of reverse not working is because the booster valve cannot create sufficient pressure to get into reverse (reverse requires the most pressure). The booster valve is worn down and the valve body needs to be replaced, rebuilt is the way to go. This is from not changing the fluid and filter every 20,000 -- 30,000 miles to keep gunk from building up and wearing down the valve.

The transmission is fine, don't let anyone talk you into putting another one in, especially for thousands of dollars, NOT THE PROBLEM.

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1998 olds bravada tranny

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