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If the transfer case actuator is working correctly, the only other possibility is the front disconnect mechanism. If this part of the 4WD system is not engaging then the Transfer Case Control Module (TCCM) will not allow the system to go into AWD or 4WD. Do yourself a favor and find a mechanic who knows GM 4WD systems. BTW, operating the truck in AWD is not good for the drivetrain, if you need additional traction, switch to 4WD.
You are right, the pressure sensors can be affected by temperature. If its below 10 Degrees there is a chance they will malfunction, I had a similar problem on my Jeep Wrangler and it required a heated garage for an immediate rectification. Alternatively, some tire shops have a computer which can communicate with the tire pressure sensors and reset the sensors once they determine that the correct air pressure has been applied to the tire.
The major problem with increasing tire size on the Envoy is at the front wheel assembly. The upper ball joint is very close to the tire, even with standard size tires. Go to www.trailvoy.com and do a search on tire size, I believe someone posted a chart of tire sizes for fit with different years of Envoy and Trailblazer.
It could be the frame is a little bent causing you to skid when it gets slick, a body shop could check it for you. also check to make sure you don't have a sticking or dragging brake pad.
not realy BUT unless you live on a mountain they are a waste of money.
a good set of winter tires will out preform chains in almost all time.
and no puting them on and off in the wet snow.
I am familiar with this code (I am a dealer tech) and the repair is to replace the electrically controlled fan clutch, it has failed, fairly common problem, it is around $150.00
ya, and all the hills make it 10x worse. i'm from pittsburgh. it all depends on how much you want to spend. but make sure they are winter performance and not all season, they are better for snow and icey conditions.
good ($150-$200):
Bridgestone Blizzak DM-Z3
Goodyear Ultra Grip SUV
Dunlop Grandtrek SJ5
best ($200-$300):
Michelin Latitude X-Ice
Pirelli Scorpion Ice & Snow
Toyo Open Country G-02 plus
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