Question about 1999 GMC Yukon

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I got a 1999 gmc yukon. The transmission is hanging up in third gear and wont downshift. What could be wrong with it. It has two new selinoids in it...

Trans, was rebuilt and drove fine when i first got it. In 8 mths it started hannging up in third gear. It will go back to first when i cut the engine off and start back up.. Got any suggestions on a fix???

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  • GMC Master
  • 2,431 Answers

VSS,On the transmission at the tail shaft is the vehicle speed sensor this sensor tends to get contaminated and give wrond sppe signal and thus wrong gear engaement

Posted on Nov 06, 2012

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6ya6ya
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Posted on Jan 02, 2017

  • 158 Answers

SOURCE: no reverse after rebuild on 4L60E Transmission from 1995 GMC Sono

There isn't a modulator on this trans as it is electronic

You can have first gear going forwrd but no reverse. It is possible. The low/ reverse clutch isn't needed to go forward.

Posted on Apr 02, 2009

Molson02536
  • 3854 Answers

SOURCE: 96 Yukon Transmission

Check the transmission fluid level and condition of the fluid. It should be bright red like Strawberry colour. If it's dark like burgundy, then the fluid is burnt and the transmission needs to be serviced. Fluid and filter changed.
Have the Truck's computer scanned for any DTC codes. Most parts store like Auto Zone or Parts Source will scan for free. If there is a engine management Issues, it may be running your Yukon on a limp mode.
Limp mode will not let the transmission shift past 3rd gear and the OD does not engage, i had a cracked ignition cap and the computer put me on a limp mode once. 
Good luck and hope this helps. Keep me posted to please.

Posted on May 10, 2009

  • 295 Answers

SOURCE: 2001 Yukon XL SLT 4 speed Auto Transmission shift problem!

Sam,

I would start with a transmission fliud and filter service.

I would then have the trasnmission checked out by a transmission shop. The transmission most of the time has the direct drum band is starting to go. The shops can rebuild it no problem, This is a very common failure wiith the trasnmission.

Good Luck

Posted on Aug 16, 2009

Testimonial: "Thanks alot richtko94'! I'll try that!"

  • 85 Answers

SOURCE: 2001 gmc yukon xl was jerking, cut off. will not start.

it sounds like the fuel pump might have died, or blew fuse or relay see if it gets fuel at the motor

Posted on Feb 24, 2010

Molson02536
  • 3854 Answers

SOURCE: My 1999 GMC Sonoma step side 6 cylinder wont start

Your loosing your fuel pressure in the system when you shut down the engine. You could have a leak in your fuel pressure regulator or your return fuel line check valve is worn, which is located on your fuel pump sending unit housing. The other thing also is you could have a weak fuel pump so check your fuel pressure at the shredder valve, you should have 62-65 PSI when the fuel system is pressurized (engine not running). Causes for weak fuel pump, bad ground wire from pump to frame or worn out pump and a dirty fuel filter.
Check your fuel pressure to ensure you have 62-65 PSI and check to see how fast your pressure will drop, a fast drop will indicate a leak in your system as to the fuel pressure regulator or check valve at the sending unit.
Thank you for using Fixya and good luck

Posted on Mar 25, 2010

Testimonial: "Sounds like a point in the right direction, will be checking out the suggestions. Thanks for the quick response."

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My 1999 gmc yukon was running fine then all of sudden wont go into gear at all if you accelerate it justs revs up and wont go


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1999 ford ranger transmission pops out of third gear


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Feb 12, 2013 | 1999 Ford Ranger SuperCab

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When my 2001 GMC Yukon tries to shift into 3rd gear or overdrive - it is like it goes into nutral. It never shifts to 3rd. 1st and 2nd gears does just fine.


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To do it right go to a good transmission shop an have it serviced and flushed.

Sep 27, 2010 | 2001 GMC Yukon

1 Answer

2001 Yukon XL SLT 4 speed Auto Transmission shift problem!


Sam,

I would start with a transmission fliud and filter service.

I would then have the trasnmission checked out by a transmission shop. The transmission most of the time has the direct drum band is starting to go. The shops can rebuild it no problem, This is a very common failure wiith the trasnmission.

Good Luck

Aug 16, 2009 | 2002 GMC Sierra 1500

1 Answer

96 Yukon Transmission


Check the transmission fluid level and condition of the fluid. It should be bright red like Strawberry colour. If it's dark like burgundy, then the fluid is burnt and the transmission needs to be serviced. Fluid and filter changed.
Have the Truck's computer scanned for any DTC codes. Most parts store like Auto Zone or Parts Source will scan for free. If there is a engine management Issues, it may be running your Yukon on a limp mode.
Limp mode will not let the transmission shift past 3rd gear and the OD does not engage, i had a cracked ignition cap and the computer put me on a limp mode once. 
Good luck and hope this helps. Keep me posted to please.

Mar 16, 2009 | 1996 GMC Yukon

1 Answer

Transmission wont shift


have the shift solenoid checked out to see if its faulty.

Feb 05, 2009 | 1999 Chevrolet Silverado 1500

3 Answers

Transmission wont shift into 3rd gear.


I had this exact problem on my 2005 5.3L Suburban... It would shift into 1 and 2 and reverse, but not 3 and 4.

I took it into a transmission shop, and he said the 3-4 shift solenoid was burned up. Wanted 1500 to fix it. Far from home, so I have to pay it.

Nov 30, 2008 | 1999 GMC Suburban

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