8 SPEED TRANSMISSION 8L90/95. DRIVE START AT 4TH GEAR, NO UPSHIFT NO DOWNSHIFT.GMC YUKON DENALI 2016 

Thanks bro

رد ي ابن الحلال

Smart town asfan jeddah.. Philippines star workshop #1248

Did you check the fluid level if it's correct level?

Possible cause low fluid level valve body solenoid..or internal.as you say that you only replace filter and fluid then suddenly the transmission slipped I'm correct? first don't drive the car it maybe damage the clutch inside.correct the fluid level and then if you have scan tool do the calibration or adaptation first..sometimes when they put a filter the solenoid connector was loosen or damage..8L80/90 transmission has a saparate solenoid you can check it one by one unlike the 6L80/90 it was assembly together TCM.

@@pjbandal Yes it started slipped after 3weeks later from changing the fluid they puted dextron VI 6 liter on it.

@@pjbandal No i will checked today.

@@pjbandal I checked the fluid on Cold and hot all OK in the correct level.