Question about 1997 Pontiac Bonneville

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Transmission will not change out of first. Can it be the modulator valve?

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There is no modulator on your car. You need to scan the computer, there will be a code. Possible problem is a shift solenoid , output speed sensor, or park neutral switch. Worst case internal tramsmission failure.

Posted on Jun 27, 2009

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Posted on Jan 02, 2017

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Locate vacuum modulator chevy trailblazor 2003


Please verify the year of your truck. A 2003 Chevy Trailblazer has a 4L60E transmission. This transmission does not have a vacuum modulator valve. The 4L60 uses a vacuum modulator valve but the last year for that transmission was 1992. The perpose of the modulating valve is to control/regulate line pressure. The line pressure in a 4L60E is computer controlled or controlled electrically.

Dec 07, 2013 | Cars & Trucks

1 Answer

Dodge 45 RFE transmission shifting hard only from 2-3 with no DTC's


Almost everything in a automatic transmission used to operated by the fluid flow. Nowadays transmissions have electrical parts too. I'm inclined to agree with your solenoid valve diagnosis. Did you notice any metallic debris in the bottom of the pan when you changed fluid?
If there is debris (and there almost always is) some may be in the bottom of the pan and some may be in the valve assembly. Hard acceleration means more fluid pressure and more fluid flow. Which may help the valve to operate. Some valves only operate a pilot circuit and ball check valve that further controls the major fluid flow.
Do you see any fluid around the modulator? And is the modulator port & orifice clear. Next time you have the pan off, see if you can pull the modulator and look at the mounting port and the orifice inside the modulator itself. If there is a dark colored square or rectangle in the pan. Wipe it off with a finger and check for grit or metal.

Jul 10, 2012 | Cars & Trucks

2 Answers

P0766


Possible causes- Low transmission fluid level
- Dirty transmission fluid
- Faulty shift solenoid D valve
- Shift solenoid D valve harness or connectors
- Shift solenoid D valve circuit is open or shorted
Tech notesWhen the a transmission solenoid is stuck off, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced. When is the code detected?The P0766 code is detected when the ECM has detected a mechanical fault with the solenoid energized, valve stuck off P0766 Description Shift solenoid valve D is turned ON or OFF by the Transmission Control Module (TCM) in response to signals sent from the park/neutral position (PNP) switch, vehicle speed and Engine Control Module (ECM) (throttle opening). Gears will then be shifted to the optimum position.

Dec 04, 2011 | Cars & Trucks

2 Answers

1998 Grand Marquis. Start goods. idols low. put in gear, stalls out. Changed fuel filter & had injectors serviced. Problem remains. Could it be the Transmission modulator valve?


I would check the operation of the idle speed control valve, it is what changes the idle speed when a load like the transmission is put on the engine, without it the engine will idle slow and stall out, this is even more apparent when reverse gear is selected or drive or the AC is tuned on. The ISC valve is located on the side of the throttle body top of upper intake manifold. Below is a picture of the ISC (idle speed control valve)
11_11_2011_10_58_29_pm.jpg

Sep 30, 2011 | 1998 Mercury Grand Marquis

3 Answers

CODE P0755 ON TOYOTA CAMRY DX


DTC P0755 - Shift solenoid valve B
This warning is turned ON or OFF by the Transmission Control Module (TCM) in response to signals sent from the park/neutral position (PNP) switch, vehicle speed and Engine Control Module (ECM) (throttle opening). Gears will then be shifted to the optimum position.

The P0755 code is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.

Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission will not shift gears.

Possible causes:
- Low transmission fluid level
- Dirty transmission fluid
- Faulty shift solenoid B valve
- Shift solenoid B valve harness or connectors
- Shift solenoid B valve circuit is open or shorted

When the a transmission solenoid is malfunction, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.

Additional test details could find in this link about Repair/05/2011ne09/cip0755 (pdf)

Hope this helps (remember to rate and comment this answer).

Jul 05, 2011 | 1996 Toyota Camry

1 Answer

I need to change the transmission modulator valve on a 2003 Chevy Impala. I need help with the location of the valve and even steps on how to change it. Thanks


Hello, the 2003 impala's dont have a transmission modulator valve. this transmission is electronic controlled by the power train control module. the transmission uses a pressure control sol. inside the transmission instead of a vac. operated modulator valve. if you are having a late harsh shifting problem, this would be more in the area of a pressure control sol. at fault

Jun 08, 2011 | Chevrolet Impala Cars & Trucks

1 Answer

The transmission won't shift out of 3rd and will only go up to 50 mph at around 3500 rpm.


check for a bad vacum to the modulator valve on your transmission,or a bad vacum to the modulator valve on the transmission. the modulator valve to the trans. works off of vacum from the engine,look for loose or disconnected vacum lines around the carb. or the air induction system. look for cracked vacum lines that seem to be sucking air when engine running at idle speed. in park. the modulator valve [usually] located on the drivers side,of the transmission,is the main cause of shifting failure. if the valve itself is bad, it will need replacement. thank you for choosing fixya.com!

Mar 08, 2011 | 1996 Chevrolet Blazer

1 Answer

Seems to shift down a gear unannounced at higher speeds. Usually when with in first 10 minutes of driving vehicle after it has sat. Fluid and filters changed, problem still exists.


check for a loose or bad vacum to the modulator valve going to the transmission. it could also be a bad modulator valve on the transmission.lucas transmission treatment is the very best for loosening stuck valves in the transmission,causing hard downshifts, and hard shifts going forward. add it to the fluid in transmission.hope this helps and thank you for choosing fixya.com if this did'nt help please repost your question and another expert will be happy to help!!

Nov 21, 2010 | Jeep Grand Cherokee Cars & Trucks

1 Answer

1995 Saturn automatic trans. shifting hard enough to brake motor mounts. Any suggestions for fixing


you may need to change the modulator valve on transmission and also check the modulator valve to be sure it's getting the proper vacum to it. the modulator valve controls shifting in the transmission. also suggest lucas transmission treatment be added to transmission fluid, it frees up stuck valves in transmission. hope this helps!!!

Sep 11, 2010 | 1995 Saturn Sl

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