2016 Sierra 1500 Transmission Slips when cold

[MisserBill]

Hi,

New Sierra with 9500 miles. Transmission has never been right, at first service complained that it lurches at low speed, such as parking in a parking lot and feeling like I've hit the concrete stop. Also noticed that when approaching a stop light, at 2-3 mph before stopping the truck will lurch. Dealer assured that they needed to change some 'codes' in the transmission.

 

Now the transmission slips when it's cold. Upon starting, the first application of the gas pedal after a shift into gear (whether forward or reverse) results in the engine winding up as if it's in neutral. After a second or two, the trans will "slide" into gear and the truck will start moving. Reminds me of my old Willy's when the clutch was worn out and would slip.

 

I'm getting ready to send the truck back to the dealer - any suggestions on what to tell them or other folks that have had a similar experience? Anyone know of any service bulletins addressing this problem?

 

thanks guys

[O_J_Simpson]

The warranties were really chopped hard for 2016 GM trucks. Tell them you want a new tranny now! It won't fix itself and will only get worse.

[newdude]

6 speed or 8 speed?

[InertiaFaze]

Just mentioned this in another post regarding delayed engagement, please have your dealer check service bulletin 16-NA-014.

[MisserBill]

6 speed or 8 speed? Pretty sure it is a 6 speed - when I use the manual shift feature it shows up to 6.

 

 

Just mentioned this in another post regarding delayed engagement, please have your dealer check service bulletin 16-NA-014. Thanks InertialFaze, I will do just that!!

[zoomiejr2]

 

 

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[Harold Rutherford]

I have a 2018 GMC Sierra 1500 the first time the truck shifts when cold it has a long hesitation between 1-2 gear and slams into gear, after it shifts a few time it's ok. I took it to dealer several times they say that's just the 8 speed transmission normal operation. After warm up it works fine but when going into passing gear it has a long hesitation and downshifts twice. Everyday driving is fine but this transmission is weird, I had a 2016 6 speed before and it shifted hard but never slipped. Anyone else experiencing this problem and is it just normal for the 8 speed?