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Check engine comes on been told it could be Pressure valve in transmission

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We can sit here and guess all day, that not going to do you any good, just gets you more worry of all the possiblitys, what need's to be done is have the code's pull from your computer, if you have no way of doing that, go to any auto parts or some where like autozone where they can do this for free, then get back with us here at FixYa with the code number, so we can help you with your trouble code, no more guessing, good luck to you my friend.

Posted on Jul 06, 2010


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Automatic transmission vehicle speed difficulty?

Parked on the ground, blocking the transmission lever in P position, players pull brakes, then step on the gas pedal and accelerate the inspection of the engine. If the engine speed is increased slowly this time, or up to a certain speed does not go on to mention, that the failure was caused by engine problems, check the engine oil pressure, cylinder pressure is normal, whether the fuel injection system, and each sensor is working properly.
Transmission failure: It may be in the transmission or burned badly worn friction plate, or transmission valve body shift valves, solenoid valves, transmission control computer and its related circuit malfunction, causing difficulty speed transmission upshifts. it is necessary to go to a professional repair shop for maintenance . via

Dec 21, 2013 | Cars & Trucks

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Codes P1782, P0755, and P0700

P1782 DODGE - 2/4-OD Pressure Switch Circuitxicon.jpg CodePossible causes- Low transmission fluid level
- Dirty transmission fluid
- Faulty 2/4-OD Pressure Switch
- 2/4-OD Pressure switch poor electrical connection
- 2/4-OD Pressure switch circuit is open or shorted
Symptoms- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shockP1782 DODGE Description The pressure 2/4-OD Pressure Switch is part of the pressure switch of the transmission. The pressure switch are located in the solenoid assembly. The switch provide input information to the Transmission Control Module (TCM). The switch will inform to the TCM is pressure exist in a specified hydraulic circuit. the TCM uses this information to verified that the solenoids are working or not.
P0755 DODGE - 2/4 Solenoid Circuitxicon.jpg CodePossible causes- Low transmission fluid level
- Dirty transmission fluid
- Faulty 2/4 solenoid valve
- 2/4 solenoid valve harness is open or shorted
- 2/4 solenoid valve circuit poor electrical connection
P0700 DODGE - Transaxle Control System Malfunctionxicon.jpg CodePossible causes- Shorted or open circuit within transmission control module (TCM)
- Failure of transaxle control module Tech notes Since the P0700 is just and informative code, check the TCM for more codes to resolve the problem.
- Engine Light ON (or Service Engine Soon Warning Light)
- Driveability problems
- Transaxle shifting problems

Jul 26, 2012 | Plymouth Breeze Cars & Trucks

1 Answer

Fix engine code p0734

There is no such part as a "MOGUALL" I think someone is pulling your leg here. The valve body would be what I would suspect or a pressure control valve.

Jun 24, 2012 | Cars & Trucks

2 Answers

My car will occasionally shift hard. after parked for about 30 minutes it won't do it again for a couple of days.

Have your transmission serviced and pressure test the transmission line. It sounds like the EPC (electronic Pressure Control) valve is starting to fail. Once the EPC valve fails, the transmission will default to the highest pressure and hard parts will eventually break. Easy fix in pan. Fix as soon as possible.

If your lucky it's going to be your TPS, Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace. TPS (Throttle Position Sensor)

Thank you for using fixya and good luck.

Dec 06, 2010 | 2002 Chevrolet Monte Carlo

1 Answer

Transmission seems to shift in and out of overdrive

Check the transmission fluid level. The sensor for speed may be tripping or not tripping causing the overdrive to engage or disengage at a particular speed. ---
Understanding the Hydraulic Control System The hydraulic pressure used to operate the servos comes from the main transmission oil pump. This fluid is channeled to the various servos through the shift valves. There is generally a manual shift valve, which is operated by the transmission selector lever, and a shift valve for each up shift the transmission provides.
Most automatic transmissions are electronically controlled; electrical solenoids are used to control the hydraulic fluid. The shift solenoids are regulated by an electronic control module. Shift timing is regulated through sensor feedback information provided to the electronic controller.
On older transmissions there are two pressures that control the shift valves. One is the governor pressure which is affected by vehicle speed. The other is the modulator pressure which is affected by intake manifold vacuum or throttle position. Governor pressure rises with an increase in vehicle speed, and modulator pressure rises as the throttle is opened wider. By responding to these two pressures, the shift valves cause the up shift points to be delayed with increased throttle opening to make the best use of the engine's power output.
Older transmissions also make use of an auxiliary circuit for downshifting. This circuit may be actuated by the throttle linkage, vacuum that actuates the modulator, or by a cable or solenoid. It applies pressure to the downshift surface on the shift valve or valves.
The transmission modulator also governs the line pressure, used to actuate the servos. In this way, the clutches and bands will be actuated with a force matching the torque output of the engine.

Oct 18, 2010 | 1996 Chevrolet Tahoe

1 Answer

Well i was told its a ground problem meaning it works in reverse where the hot wire is running but not grounding to finish the connection to engage now i was told the ground wire is located on the...

If you mean you lose your revers from time to time, you can check the wire harness connection on the passenger side of the transmission around where the Catalytic Converter is at. Inspect for any loose or damaged connections or wire from corrosion or heat from the catalytic converter.
The other cause of no revers is “lo-reverse” clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell. It is possible to remedy a fluid problem by removing the checkball from its cage in the case in the rear of the trans may help (must remove valvebody), or adding a high-viscosity additive such as Lucas Transmission additive or other seal restorer product. May also have worn boost valve (can replace in the pan).
Put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.490" boost valve (easy fix in pan).
Good luck and hope it's just a loose connection that can be cleaned with brake parts cleaner and reattached if no damage is found to the terminals and wire leads. Thank you for using Fixya

Mar 10, 2010 | 1994 GMC Jimmy

1 Answer

92 accord stalls badly, will even die going slowly. No check engine light comes on. Changed plugs, cap, rotor etc. not sure what to do next. I was told that it was the temp sensor for computer, changed...

I would check fuel pressure. It should be somewhere in the neighborhood of 35-40psi. There is a Schrader valve (looks like a tire valve) somewhere in the fuel plumbing on top of the engine. I don't believe the MIL light would come on for low fuel pressure.

Next would be to check the EGR valve. Maybe it's stuck open and dumping exhaust back into the engine

The O2 sensors should throw a code at this point if they were to blame, but can't rule them out yet. They are a preventive maintence item and should be changed every 80,000-100,000 anyway.

Another point to check is the distributor, these cars were known a bit for having that go out, but it usually just won't start.

Dec 29, 2009 | 1992 Honda Accord

1 Answer

2002 Buick Rondevoux 3.4 V6. Makes a noise from the engine like a buzzing sound. Sounds seems to come from power steering pump. I had it changed twice and still have the sound. Car is quit for twenty...

if the noise is different in park, rev or drive , its in the trans. if no difference, take the belt off and see if its still there, its just a process of elimination. the fuel pressure regulator should have a vacuum hose on it, see if it changes when the hose is removed (higher pressure)

Oct 02, 2009 | 2002 Buick Rendezvous

1 Answer

2002 Buick Rondevoux 3.4 V6. Makes a noise from the engine like a buzzing sound. Sounds seems to come from power steering pump. I had it changed twice and still have the sound. Car is quit for twenty...

The GM 3.4 v6 engine is known to have Intake manifold gasket failure problems. IMHO, I do not believe this is fuel pressure release valve problem, since you would have fuel leaking. If it is more of a whistle rather than buzzing, i would suspect manifold gasket.

Oct 02, 2009 | Buick Rendezvous Cars & Trucks

1 Answer

Toyota Camry Automatic Transmission Jerking Shift

Not likely to be the clutch pack as you dont mention slipping wich is the normal sign of overheated or worn clutch bands.Not sure with your vehicle but 2 methods that control the shift severity are engine vacuum or pump pressure inside the auto. so check balls are a possibility. They are spring loaded to open at a set pressure,or close.Could you check to see if its a vacuum controled and if so its a lot easier to fix as the vacuum control should be outside the trans.

Oct 15, 2008 | 1999 Toyota Camry

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