Question about Oldsmobile Bravada

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In my 2002 oldes bravada. the AWD won't engage. when its on a lift the front tires barely start moving at 45mph. No lights come on in the dash.

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First of all check the AWD fuse and fuse for dash in the fuse panel.If fuses checked out OK then,
There is a separate control module for  AWD system, apart from the main computer (PCM or Power-train Control Module).Either this module is faulty or the transfer case is faulty.
Try the module and/or the sensors mounted on the transfer case. There are 3. One is the VSS (Vehicle Speed Sensor) and when it goes bad, according to Haynes, it can cause drive-train problems. The other two are looking at transfer case output shaft behavior. These sensors are associated with the aforementioned "AWD module", not the PCM.
Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

Posted on Jun 05, 2010

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I'm pretty sure the computer controlled NP-136 transfer case (which uses two speed sensors to sense the difference in speed between the front output shaft and the rear output shaft, and engages the front axle accordingly) was installed in 1998 and later models.

These trucks (mine included) use an "Active On Demand" transfer case. Basically its a normal 4x4 transfer case with a big electrically actuated (by way of a motor) clutch that connects the front prop-shaft (which is being spun by the wheels full time) to the transfer case front output. Its all in the transfer case.

Good luck and hope this help, check all the fuses and the wire harness to the encoder motor and replace the encoder motor if it has gone bad. Try bring it to a transmission shop that is familiar with the AWD system on your Bravada. The earlier years were a different system, 1998 was when the change was made. 1997 and earlier use the Borg-Warner 4472, which is always engaged with the use of the viscous coupling. Both were marketed as "SmartTrak" though.

Sounds to me like the transfer case actuator motor is either faulty or it is being told to be on all the time (which it shouldn't be).

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My poor olds!!


Possibly different tires sizes or bad speed sensors combined with a bad transfer case encoder motor? Try "thepartsladi" eBay store if you have to buy the encoder motor, beware aftermarket parts on Bravada!

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