Question about 1999 GMC Yukon
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???
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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Posted on Jan 02, 2017
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
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
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.
Posted on Aug 16, 2009
Testimonial: "Thanks alot richtko94'! I'll try that!"
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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