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GMC Forum: yukon won't shift into 3rd
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Old 03-04-2011, 08:04 AM
kboukari kboukari is offline
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Join Date: Mar 2011
Posts: 0
Default yukon won't shift into 3rd

I was driving my yukon at about 60mph when suddenly the RPMs jumped and the engine got really loud. I slowed down and could not get the truck to go beyond 2nd gear. It shifts just fine into Reverse, 1st and 2nd, but then the RPMs jump when it is supposed to go to 3rd gear. I can get it to go into third gear if I push it pretty hard, but not easily. checked the transmission fluid, and it was low. The dash pannel never told me it was low on fluid and the thermostat for the transmission never showed it above normal range. The speedomoter has not worked for about a year now. It slowly went out and I just assumed it was the motor for the speedomoter, as this is a very common thing for GMC. The oil gauage works, but it stuck in the wrong range. It goes from max to beyond the max line, but still fluxuates. The other gauges work fine. I have obviously put more transmission fluid in it, but that didn't help. I have done some research and some things suggest the VSS, which I have not tried. Can anyone please help who may know why the truck is doing this.
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Old 07-10-2011, 11:55 PM
Monsolo Monsolo is offline
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Join Date: Jul 2011
Location: Indianapolis, IN
Posts: 17

Mine's doing the exact same thing... I hope I get an answer faster than you did! Jeez, you didn't get an answer AT ALL!!

Come on, guys! This is supposed to be a HELPFUL forum! No disrespect to everyone but COME ON!!!!
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Old 07-12-2011, 04:58 PM
happy 2011 happy 2011 is offline
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Join Date: Apr 2011
Location: new hampshire
Posts: 540

well the speed sensor some times can cause this problem. It happens just like you said 1st 2nd ok push for 3rd and it will go some times. thake it to a honest trans shop or the dealer and tell them you had this happen before and think it's the speed sensor. That way it will put a bug in the techs ear to check bthe sensor so you don't buy a unneeded tranny.

Good luck
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Old 07-14-2011, 07:45 AM
GMC Customer Service GMC Customer Service is offline
Join Date: Mar 2010
Location: Michigan
Posts: 570

Sorry to hear about what’s going on with your Yukon, Monsolo. It’s been a few days since you posted this. Have you made any progress with this concern? Are you thinking about taking your vehicle to the dealer at all or handling this on your own?

GM Customer Service
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Old 11-23-2012, 08:51 PM
raymond651 raymond651 is offline
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Join Date: Nov 2012
Location: Louisiana
Posts: 5
Default Yukon transmission

I hope all came out okay with the "possessed" transmission you described in your post. Can you let me know how it was checked and fixed? Was it the Speed sensor?

I have a 2003 GMC Yukon that I bought new and my soon-to-be-ex-wife drove the first 7 years of our owning it, but I drive now. It has about 138K mi. on it and it has truly been the best vehicle I have ever owned, hands-down! Now that I just jinxed myself, I wanted to comment on the Transmission.
Lately, I've noticed that when I come to a stop at a red light or stop sign and not take my foot off the brake pedal to roll a little bit while stopped, when i do take my foot off to press the accelerator and go, I hear the transmission bang into gear right when I lift my foot off the brake pedal. It's either downshifting into first of disengaging from whatever gear it was in at my stop. I guess this is a slight "slip" in the tranny! If, while I am waiting for the light to turn green, I lift my foot off the brake pedal to slightly roll, I hear it then and won't hear/feel it upon taking off. Anyone else relate to this?
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Old 11-25-2012, 05:07 PM
megmusgrove megmusgrove is offline
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Join Date: Nov 2012
Posts: 3

My 04 is doing the same thing! It was fine one morning, then in the afternoon it started shifting a little funny . . .got the oil changed and filled up with gas so I could add some Lucas Oil and barely made it up the mountain to get home. After working it to get up the last steep bit I limped it home while it was telling me TRANSMISSION HOT. Since then I haven't been able to get it to shift into 3rd and I don't dare drive it off the mountain. I've put Lucas Stop Slip in it and that didn't help. I've already had the transmission rebuilt once as reverse was going out. That was about 3 years ago. I'm afraid if I take it to a shop they're just going to say it needs rebuilding. I just can't fathom the thought of rebuilding it twice in the same vehicle!! (And had to do the same in previous one ugh!) Any word on what it is and how to fix it without rebuilding???
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