Engine revs when shifting from P/R/D

[sievz7]

Guys,

I know that this has been discussed before, but I couldn't seem to locate it via search, so I thought I would just throw it out there.

Most times when I am backing out of my driveway and shift from R to D, the engine revs up to about 1500 before shifting into D. I'm not one of those people (my wife!) who slams it directly from R to D without letting the vehicle stop rolling backwards. Usually, I will even pause in N until the vehicle comes to a stop before shifting into D.

I have also noticed a similar situation while slowing to a stop and the tranny is downshifting on its own. The engine revs up and I can actually feel the truck working against the brakes.

Tranny in need of a software update? Re-calibration? Anyone else see this on their truck?

Thanks,

Sievz

 

[sievz7]

anyone??? My next call is to the dealer, but thought I would check here first as I can usually get better info!

 

[jee123]

did you get a tune after putting the 22s on?

 

[sievz7]

No, no tune. My tahoe is 100% stock other than the wheels. I'm pretty sure it acted the same way before I put the wheels on too.

 

[hassoun]

i would suggest you sea-foam it and clean the throttle body. i had a similar issue on my 01 Denali but wasnt 1500 rpm was just about 800 rpm. sea-foaming and cleaning the throttle body wont cost you more than 24$ so i suggest you do it before taking it to the dealer

 

[wheatswake]

i would think would be under drivetrain 100,000 mile warranty

 

[hassoun]

you're actually right. it could be under 100k drivetrain warranty. did they introduce that warranty thing in 08 or 07 ?

 

[sievz7]

I don't think it is actually any kind of warrantable failure. I thought I read on here somewhere before that someone had the same issue and their dealer updated the transmission with new software, but I can't seem to find that thread....

It seems to be less of an engine issue and more on the tranny end of things.

Thanks for the replies though guys.

 

[wheatswake]

let us know what you find out. i had a friend who said the dealership updated his ecu because of a hard shift when he came to a complete stop. his problem stopped. i had the same problem as my friend and the dealership re-greased my yoke. i have not had it since. so i dont know. from what i know they update your ECU (not transmission) which also controls your engine/reads sensors. which means it could be a bad sensor somewhere or even ECU, which i would think is under warranty. with the toyata thing going on, i would think if there was an update due to reving motors they would be all over it.

 

[puckhead]

I will check when I get in the hoe next but mine does this too. I dont think it is anything to worry about, IIRC mine has done this since I have owned it