2010 GMC Yukon harsh ride

I it electronic suspension? if so check to see if compressor works and or all the sensors aren't stuck in position check for air leaks as well

check for a broken rod there are one on each side in front and one in rear. I hit the send button by mistake.

I replaced all 4 sensors ,new shocks , new strut seats ,performed trim height calibration .Nothing work .
I drove a lot of Denali truck and suv ride is compared 10000% difference .
Gm truck and suv with this suspension has the best ride .

have pro rescan it as something isn't right as it shouldn't do that. you need a pro style scanner for this not one from an autoparts.

the car is checked in the dealer and no code found also dealer cant find problem

hen check your work something isn't put on correctly or not using electronic shocks which should have electric plugs on top maybe the arms of the sensor are on backwards and are up to high for sensors to read anything. I have no further suggestions as I can't see what h as been done to it.

can it be coil springs or top strut plug cause its the only thing not replaced

without seeing it I have no idea. recheck your work as I last suggested. I have no further comments

what voltage can I get from damper solenoid ?
I checked pin A and found 9.xxV and pin B is low ref
is it ok

between a 7 b you should have .7-3.3 ohms if not that replace the damper. if your service ride control or service suspension light is on it must be scanned. if you replaced all of those parts then did not have it reset with a full tank of gas then that is your problem. you need a scanner pro model to test between A & B not voltage to see if it is properly working or not

Measured ohms all ok . I did alc trim height with full tank still the same .
I have a pro scanner but i can see damping % only . When u put it in gear damping go to 20% the 0 as soon as u let the brake pedal and move . While driving it show 0 % on high way . Its barley some times show 20% or 100% on 30 min drive .

without actually seeing this physically I can go no further giving you an answer. I would check with dealer to see if there is a software enhancement for the module and check module ground as well as seeing if ride height sensors are installed correctly and links not broken. I have no further comments.