First time using this, usually I can always find the answer to the problem but not this time, so please any help is greatly appreciated. I have a 2005 Yukon xl Denali with 113,000 miles that I just got about a month ago. Everything has been good until I had a new exhaust installed. It started out with revving high shifting between second and third, sometimes it does sometimes it doesn’t. Just today I noticed it seems like the brakes are holding when you accelerate away from a stoplight and then after a 100 feet or so and shifting fine on its own from first to second you can feel it just let loose like a rubber band was holding it back and it snapped. All gears work, no hard or rough shifting, no CEL, no codes... I don’t know what it could be?
05 Yukon Denali XL Transmission problem or brake issue?
- Thread starter Pence1231
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PNWYukon
Full Access Member
But it was fine before the new exhaust??? You should get a live data code reader and monitor what it is saying during these episodes.
Welcome to the forum from Oregon.
We recommend that you put all your rig(s) info in your signature so we all don’t have to guess at year, make, model, engine size, trans, rear axle locker…….etc. While you may have posted pertinent info in your first post, you may forget to do it again and the info is needed by us anyway. Makes it way easier on all members that attempt to help, to have that info right up front. It is also recommended that you take a pic of your RPO codes, on the inside cover of the glove box, and post that image in your signature. All this info will greatly help those that will try to help with a problem.
If there is any other info, like upgrades, mods or recent mechanical/maintenance work done, that would be helpful in any post as well. Too many times a question is asked by the poster and after about 10 responses we find out that the poster has done recent work to attempt to fix the problem or work that was done that SEEMS not related to the problem.
We recommend that you put all your rig(s) info in your signature so we all don’t have to guess at year, make, model, engine size, trans, rear axle locker…….etc. While you may have posted pertinent info in your first post, you may forget to do it again and the info is needed by us anyway. Makes it way easier on all members that attempt to help, to have that info right up front. It is also recommended that you take a pic of your RPO codes, on the inside cover of the glove box, and post that image in your signature. All this info will greatly help those that will try to help with a problem.
If there is any other info, like upgrades, mods or recent mechanical/maintenance work done, that would be helpful in any post as well. Too many times a question is asked by the poster and after about 10 responses we find out that the poster has done recent work to attempt to fix the problem or work that was done that SEEMS not related to the problem.
Sounds like a transmission slipping to me but it’s hard to tell. What type of exhaust did you have done- catback, longtube headers, etc. Just trying to see if they might have been working in the area of the wiring harness for the trans. Also do you have any DTC’s?
