SERV 4WD

[CUZICAN]

Wondering if anyone has had this problem, didn't find much results in searching for this thread. Here's the situation. We just got 12inches of snow with drifts of 3-4 feet. Had to switch to 4lo last night to get to my house and now it won't switch out of 4lo. Message on DIC says SERV 4wd. If I shut the vehicle off and turn back on, put in neutral and push 4hi it tries to switch back but can't. When you put it back into gear the message comes on again and if you go back to neutral it won't even try to disengage when pushing 4hi. Would a build up of snow and ice in the wheels and underneath create this problem? Dealership said no. Any ideas? Oh yeah, just had the differential fluid changed at the dealership 3 weeks ago trying to avoid having these sorts of problems. Is it possible they did something wrong? This is the first time I've used 4lo since then.