When it rains or is high humidity my 4WD selector buttons/lights default to 4WD Low and won't change so I can't drive it to work or long distances. Can it be made to stay in 2WD all the time by deactivating it on the 4WD transfer case. It's liike there's a short somewhere in the actuator. I've only needed the 4WD twice in 10yrs.

stops smoking when warmed up. no check engine light.

Notice of "check Gas cap" came up dashboard Tuesday. Gas cap was tight. Repair shop Cleared code - light went out. On Wednesday check Eng light came on. Replaced Gas cap. Repair shop Cleared code again- light went out. On the way home light came back on again. Diagnostic meter says "Emission Sensor Valve" Both times -->i believe was the Code name when they told me to tighten and/or change the Gas Cap which neither worked. Any suggestions?? What & where is the Emission Sensor Valve??

the battery is new and the connection are tight. When i turn the key it makes no sound at all. the lights are bright and the accessories work fine.

Somehow it came loose and dropped down into the dash and I cannot get to it to "pop" it back into place.

I'm trying to take the plastic skin off back bumper. I,m done except for where you unlock the spare tire, thats the only thing still holding the skin on. Does anyone know how that disassembles?

the rear end in my Avalanche has a whirring sound notice it gets quite taking curves when the pressure is on the rear driver side, the noise is louder as you take a curve to the left with pressure on the passenger wheel. I've had the inner axle bearings replced, and heard GM had a problen with the interim shaft....any sugesstions?

white smoke coming out of the exhaust and rattle when acceleration

My oil pressure is running higher than before (40-45)and it fluxuates as the vehicle speed does. Oil Sensor or Oil Pump?

what does "check engine oil life 95%" mean

I dont what "check engine oil life 95%" means? it happen where my miles would nomally show.

My service stability light just came on, what the heck does that mean?

were are the secondary air injection check valves

the brake light works the turn signal light works the backup-light works but the running light does not i have replaced all three bulbs

rubber rubbing sound coming from rear in forward motion only, no sound when in reverse