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Transmission won't downshift properly

Won't downshift going up hill

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How do I keep my transmission from downshifting itself out of overdrive, and turning the O/D On dash light off?


they are supposed to downshift if the load gets too great , like climbing a hill and they do not have to be big hills . a lot depends on the load being carried .5 large adults works a vehicle harder than 1 adult and 5 children

Jan 23, 2016 | 2007 Ford Expedition Eddie Bauer

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On My 2002 Hyundai Elantra after 5-10 min of driving fast and hard accelaration will downshift the transmission.What can cause that,?Check engine light is not on...


Most modern automatic transmissions have a chip in them that will prevent the car from downshifting, say, into first gear when you're moving at 60 mph. Still, I wouldn't try it. When climbing a hill, only downshift if the AT can't decide which gear to be in and switches back and forth--choose the lower one. When descending use brakes to decelerate. However, once you've braked, do use a low gear to coast in, to prevent you from freely accelerating down the hill.
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GM Tech2 GM Diagnostic Scanner With C card

Dec 18, 2012 | Hyundai Motor 2002 Elantra

1 Answer

97 dakota 3.9 no pulling power


When you say going up a hill are you wide open throttle? Does the bucking occurs at 5300 RPM? If you are you have reached the fuel shut off limits before the transmission can shift,This happen if there is a high demand on the alternator, The solution for this is a redesign of the govenor pressure sensor on the transmission.But before you even decide this is a solution make sure the throttle valve cable is properly adjusted,(this is the downshift cable)

Mar 26, 2012 | 1997 Dodge Dakota

1 Answer

Why does my cruise control have my transmission downshift so low going uphill that it revs up my rpms and doesn't want to shift up once you crest the hill?


It's the way it was designed. You could give a dealership a call and ask if this is abnormal but it would seem to be normal to keep the proper speed. Thanks for asking!

Jun 29, 2010 | 2005 Mazda MPV

1 Answer

2002 subaru 2.5 l engine pinging heavily going up hills. Timing marks all are on the money. No check engine light for the knock sensor. Not overheating and EGR appear to be working properly


Try better gas for a tank and make sure it's the transmission is downshifting when you go up the hill. After that the valves may need adjusted or replaced.

May 12, 2010 | 2002 Subaru Legacy

1 Answer

04saab93linear rpms spike up when going down hills slowly


This is a common feature on many cars. If you press the brake on the way down the hill, the transmission will downshift and keep RPMs high in order to prevent your speed from increasing too much. If this bothers you, you can simply shift into neutral and brake manually. The only other option is to coast freely down the hill without brakes. No brakes = no downshift = no high RPMs.

Jan 13, 2010 | 2004 Saab 9-3

1 Answer

I just purchased this vehicle. It has the 3.0 liter engine and 139,000 miles. It is not overpowered by any means and sometimes when you step down and it should downshift it does. Other times you can go to...


SOLENOID ARE NOT ACTIVATING WHEN THEY SHOULD CHECK THE COLOR OF THE TRANSMISSION OIL IF ITS DARK BROWN AND SMELLS BURNT THEN YOU HAVE A WORNED OUT CLUTCHES

Jun 29, 2009 | 2002 Ford Taurus

1 Answer

Transmission downshift problem


This vehicle had a problem with the valve bodies in the transmission. There are several servos that assist the transmission to shift. This problem is best diagnosed by a local trans shop that can do an OBDII test to see if the trans has the proper voltages to the servos as well as to check the pressure.

May 21, 2009 | 1994 Oldsmobile Silhouette

1 Answer

No tranni downshift upon heavy accel


Hi, two possible issues here. the first could be a malfunctioning shift solenoid. this can affect the shifting operation. the next issue could be the transmission control model(TCM). if this fails, you will experience abnormal shifting during up and downshifting. I would check these areas as well as the fluid level as well. Some transmissions are sealed and you cant check the fluid level. if you have a transmission dip stick visible, please check the fluid level before you check the other areas.

please rate and god bless.

Mar 25, 2009 | 2002 Chrysler Voyager

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