Sporadic Operation of All Wheel Drive System on Saab 9-7x

Problem Description and Possible Solution

The wiring for the transfer case speed sensor can fail causing sporadic operation of the AWD (All Wheel Drive) system.

Problem Data
RepairPal Verified
Average mileage: 83,485 (115–147,000)
5 model years affected: 2005, 2006, 2007, 2008, more2009
33 people reported this problem
Viewing 1 - 15 of 15 comments
When I'm driving And i turn left or right. The car stops or staggers, or locks up. I can't pinpoint if its all wheel drive problem. I've taken it to shops, yes I've taken to a couple different shops and they think rear differential needs replaced(oil) or transmission. I think its what the problem says up top!!
Mine was fine when i ought used. Soon it became a night mare. Locking-up when turning,going backwards or forwards. Clunking, wining when slowing down. So I looked on line and many others have this problem. I changed the Motor on the side of the transfer case and the problem went away for about 3 weeks. $150.00 for the part and not fixed. The parts store has a control box that is for the AWD system that costs $120.00 and I can't find on the 9-7x where it is. So i disconnected the motor on the transfer case, no more problem. DO NOT let a mechanic tell you the differentials need fixed. This proves to myself and others there is nothing wrong with them. The control box i found where is goes, replaced it and all ok. SAAB would not tell me where it was. They wanted $120.00 per hour to replace with my part.
I traded it off. Some one else can have the next trouble now. I can say i liked the truck for every thing else.
NO traction at all in the snow/ice. It is supposed to engage when the back tires slip...only one of my tires is spinning.
The all Wheel Drive seems to be trying to engage when I stop at a Traffic Light that is on a slightly downward slope. I feel a slight nudge click several times. I this the speed sensor, transfer case, transmission. I am ready to do a Transmission Fluid / Filter change and though maybe it is a Hydraulic thing. The vehicle runs great other than that. My tires all match and shift great moving.
Had to replace front differential. The transfer case encoder seemed to be the issue after all said and done. Wheels would lock or shutter when turning into a parking space. It felt like a 4wd truck engaged and then suddenly driving on clear asphalt.
I have had a speed sensor problem for years but was told I would have to get a "transmission rebuild" for a inexpensive part to be replaced. There was a sporadic problem when accelerating from a stop where the vehicle would jump between 1st and 2nd gear. On highways it drove fine and would even seem to re-set itself. Today my "wheel lock" problems have become more of an issue when braking and turning slowly or coasting and hard turning, the steering wheel and turning radius will want to lock and not cooperate.
When I try to turn from a certain speed it starts thumping and making a clanking noise I have to stop completely and put in park then slowly change gears the motor has been replaced 2 times already at $800 each time and can not afford it again
Going straight is fine, turning sharp right turn started to lock up and made loud bumping noise. Then when turning left same issue. Not fixed yet.