Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means: Evaporative emission control system malfunction
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means:Evaporative emission control system malfunction
The 2001 Yukon Denali has a very poor gas mileage per gallon. The gas tank capacity in these vehicles are 26 gallons.
Trouble code P0440 means: EVAP Purge System Fault Trouble code P0441 means: EVAP Purge Flow Monitor Fault
DEXRON iii ATF
If fluid is full - bad sensor?
Use an 80-90wt gear oil
they cannot or the clutches will burn out
Trouble code P0440 means: EVAP System No Flow During Purge
It should use 5W-30. It will say on your oild cap, but that is probably what is recommended.
Your 2001 gmc Denali is all time 4 wheel drive. It doesn't turn off. Only the slt, sl, and lower models have a push button 2 wheel to 4 wheel drive.