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The problem is the transmission,lossing the hydraulic pressure when travelling in a long trip

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Its hard putting into reverse


Normally when the transmission is hard to get into a gear ,it means the clutch isn't fully releasing making it hard to put the transmission in gear. More information is needed. If this vehicle has a hydraulic master cylinder for the clutch then the reservoir needs to be checked that the fluid is in the full range, If it is then there could be air in the system and the hydraulic system will have to be bled to remove the air. If the vehicle has a cable then the free travel needs to checked. If there is too much free travel then the cable will need to be adjusted to remove the free travel.

Nov 03, 2015 | Cars & Trucks

1 Answer

My 1999 accord wont shift into gear while its on but will when its off its a 5 speed.


It's your hydraulic clutch system that probably isn't working. When you press the clutch pedal down, it causes the clutch master cylinder to put pressure in the line to the transmission's little "slave cylinder" that operates the clutch inside the transmission bell housing. This disengages the engine from the transmission so you can shift gears. It's probably not putting the slave cylinder to work by hydraulic pressure. The clutch master cylinder is mounted on the firewall, similar to the brake master cylinder, the clutch cylinder has a reservoir and you may need to add brake fluid to it. If it is dry, then you will need the system bled at the slave cylinder by a pro or someone who understands how. Pretty simple, really, just like bleeding brakes. Also the clutch master cylinder can develop internal leaks and this will lead to loss of clutch.

Nov 02, 2015 | Cars & Trucks

1 Answer

Why wouldnt daihatsu sirion take any gear after changing automatic transmission oil?


There are a couple reasons. First, it could be the wrong oil, but I'm guessing you probably already ruled that out. Second, once you drain the transmission pan and refill it, you must run the vehicle and cycle through all the gears to get fluid into all the hydraulics of the transmission. This will most often result in needing to add more fluid. You must be careful not to add too much transmission fluid though, since this can cause foaming and loss of hydraulic pressure as well.

Dec 23, 2014 | Daihatsu Cars & Trucks

1 Answer

Can low transaxle fluid prevent transmission from working?


Yes low fluid level can cause loss of hydraulic pressure in the transmission and that makes for no engagement, but the level must be really low, it would not show on the dipstick or at the fill point if you checked it.

Feb 09, 2012 | 2000 Subaru Impreza

1 Answer

Wont go into gear but shifter moves


Hi Craug:
I suggest check the operation of the shift lever on the transmission as the shifter is moved inside the lever, if it does then it sounds like a complete loss of transmission hydraulic pressure. I assume that the fluid level is OK.

Some fault code there? Scanned PCM to know if have DTC stored. There is just about only one reason that it won't move in any gear and that's loss of hydraulic pressures which can be caused by a major component failure.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

Nov 15, 2011 | Cars & Trucks

2 Answers

I have a 2004 Jeep Wrangler 4 cyl. The CEL came on. Had no power for a little bit. Went to autozone and it pulled code P0870. Any suggestions.


po 870 refers to transmission fluid pressure- check fluid level of trans while parked with engine running and the jeep level.- if level is ok- might be time to have filter and fluid changed

Sep 15, 2011 | 2004 Jeep Wrangler

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

What could make my oldsmobile 1992 ciara shift to neutral when it gets hot


this is caused by loss of internal hydraulic pressure inside the transmission, either the front fluid pressure pump is defective or u have a rubber fluid pressure seal that is leaking, is the fluid brown looking?

May 19, 2010 | 1990 Oldsmobile Cutlass Calais

2 Answers

Buick transmission issues


THIS PROBLEM IS CAUSED BY LEAKING PUMP SEALS AND THE RESULTING LOSS OF HYDRAULIC PRESSURE TO THE FORWARD CLUTCHS, THE TRANSMISSION WILL NEED TO BE OVEREHAULED TO CORRECT THIS.

May 12, 2010 | 1987 Buick Electra

3 Answers

Clutch goes to floor can't shift gears


bobby: what you are experiencing is a hydraulic failure. Either the clutch master cylinder, the slave cylinder or both have failed.
If you open the hood, look on the drivers side close the firewall.
There should be a white plastic cylinder with a cap on it.
Remove the cap and see of there is any fluid inside of it.
Note: The cylinder you are looking at has only one cap.
If the cylinder is low or empty, fill it with DOT 3 brake fluid
Look at the cylinder and you should see a line which attaches to the end of it. Follow the line down into the engine compartment.
It should travel over to a flexible hose which will go over to a smaller part on the transmission. Look at the hose and the part on the transmission, checking them for fluid loss. If you see no signs of leaks, get in the car and start pumping the clutch pedal. If the fluid loss was slow, the pedal will come back up, but it will be spongy.
If you look from inside the car, under the dash, follow the clutch pedal up to the place where you see a metal rod connecting to it. Follow the metal rod to the fire wall. Look and see if there are signs of fluid loss from there. You will need to get the air out of the hydraulics if you had just restored the pedal.
If so, the master cylinder will need to be replaced. Usually, I suggest replacing bothe master and slave cylinders because they are the same age and have the same wear and tear.

Apr 25, 2009 | 1991 Mitsubishi Eclipse

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