Question about 2000 Saturn SL

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Park neatrul switch

It goes in to overdrive and you pick up speed and it like slams on the brakes to switch gears by itself then it switches and keeps going. it won't do it in 2nd and 3rd though. and it won't lock into place on the shifter once you move it. and you have to manually move the switch back into park.

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  • 186 Answers

Most likely you have a trans range/neutral safety switch on the transaxle bad or misadjusted.Or you have a Line pressure actuator failed inside valvebody.

Posted on May 09, 2009

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How does an automatic transmission overdrive solenoid and part throttle unlock work


When you depress the throttle, the throttle sensor electronically tells the computer to take the transmission out of overdrive and when the throttle is released overdrive comes back on. When you depress the brake pedal, it also will go out of overdrive by a switch connected to the brake pedal with the brake light switch. Let off the brake pedal and goes back into overdrive once at speed.

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Wont shift into drive


The "Drive" you speak of is Overdrive.Youve lost connection to it.Possibly the brake pedal switch under dash has burned out and not putting power to the trans for overdrive.When you touch the brake pedal,overdrive goes off.When released,overdrive can come back on when at spped to do so.This switch could possibly just have come unplugged also.Check this first and plug it back in and drive it.

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You need to check the brake circuit with a meter.
The brake switch signals the shift lock solenoid to release.
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Mar 06, 2013 | 1995 Ford Thunderbird

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At about 45 miles per hour the overdrive goes in and out once you get past that speed everything is okay.


45 mph is about the speed that the switch is set to engage the overdrive. Typical problem if you know of a good transmission shop they may be able to make adjustments. Unless it is slamming in/out rapidly frequently I would probably ignore the problem.

Dec 22, 2010 | 1999 Lincoln Town Car

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GEARBOX UNDER PERFORMING


Hmmm perhaps your hitting the rev limiter, or the top speed limiter in the ECM.

Check the interlock switch at the brake pedal.

Sep 10, 2009 | 2000 Volkswagen Golf

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The "off" light for the overdrive shut off flashes.


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1999 nissan frontier overdrive problem


juan: there is a cable which comes from the transmission to the throttle linkage. This is called the TV (throttle valve) cable. This is designed to work in conjunction with the position of the throttle. I'm sure you heard the term "KICK DOWN SWITCH". Well this essentially is doing the same thing. If the cable is out of adjustment, it will have a tendency to want to downshift into 3rd.
Even though overdrive is electrically actuated, it can be disengaged by the throttle position.
There is also a coolant temp sensor which keeps the transmission from shifting into overdrive until the coolant temperature reaches a certain point. The sensor tells the ECM to tell the Solenoid it's ok to supply a ground to it.
Your overdrive switch provides a ground to actuate the overdrive solenoid. Make sure the switch has a solid ground serving the circuit.
The torque converter solenoid picks up it's ground from the ECM.
Both solenoids are served by the same power source which is a switched circuit through the ignition.
I hope I have shed some new light on your problem and given you some new direction in which to look. I hope I have helped you resolve your problem. If not, I'll be watching and will be ready to offer more help if needed. ..mybunkey

Apr 10, 2009 | 1999 Nissan Frontier

1 Answer

Overdrive button


from the car manual:

Tum the overdrive switch on for good fuel
economy and smooth driving. If engine braking
is needed in the "D" range or if repeated
upshifting and downshifting between the 3rd
and 4th gear is needed when climbing a
gentle slope, it is recommended that the
overdrive switch be tumed off. Tum the
overdrive switch back on immediately afterward.

When the overdrive switch is tumed on, the
transaxle will automatically upshift to the second,
third and overdrive gears. When the overdrive
switch is tumed off, the transaxle will not
upshift to the overdrive gear. For normal driving,
the selector lever should be left in the "D"
position and the overdrive switch tumed on.
If you need to accelerate rapidly, press the
accelerator pedal all the way to the floor. The
transaxle will automatically shift to a lower gear,
depending on the vehicle speed and load.

Jan 19, 2009 | Hyundai Accent Cars & Trucks

1 Answer

Transmission automatic slips in higher gears


This sounds like the main clutch pack has failed, is the fluid dirty?

Nov 12, 2008 | 1988 Chevrolet C1500

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Gear shifter lock and car wont start


Try removing the trim around the selector and see what is jamming it - there's usually a brake interlock that keeps the car in Park until the brake pedal is held down (this activates a switch on the brake pedal arm, which disengages the lock). The way I see it, you either have a faulty brake pedal switch, or the lock itself is jammed. Look in there and see if it's something that shouldn't be there - if the shifter is being held in place by a device that is part of the car, chances are the brake pedal interlock switch failed. If you have a pretzel or something in there, well, there's your solution:)

Aug 26, 2008 | 1992 Honda Civic

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