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Transfer case troubleshooting

Check light on code U0101

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Growling sound coming from the front drive shaft housing of a 2007 h3. there is slack in the yoke where front drive shaft bolts to the transfer case. afdter removing the front drive shaft the truck will not pull (in any mode) from the rear. has anyone got an answer to the problem barring gas and a match?

Posted on Aug 22, 2014


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The 2004 Trailblazer will not go into forward gears but will reverse while in 2 WD. It will go into forward gears while in 4 WD. What's wrong?

First I would check the PowerTrain Control Module for any thrown diagnostic troubleshoot codes by using a code reader.
I am unsure if there is a separate transmission computer module for your vehicle. If there is, a code reader will be necessary.
I will assume that the "check engine light" or MIL did not illuminate or the 4wd or 2wd light flash since you did not mention it.
If the car can move forward and backward in 4wd, then it's not the transmission itself since power is transferred through the output shaft of the transmission to the transfer case.
I would think that 4-wheel drive mode is not fully disengaging-
Check the vacuum hoses for damage, crimps, or leaks
Check and test the vacuum actuator
check and test the transfer case switch
check the vacuum actuator cable for damage or defect
check and test the encoder motor actuator on the transfer case
Buy a repair book or shop manual specific to the year, make, and model of the car you are having problems with that offers descriptive troubleshoot and repair procedures with illustrations. You can purchase them as soft or hardcover books or electronic downloads. Here are a few publishers, Chilton, Haynes, Motors, etc. Do an online search or go to your local auto parts store.
Otherwise, if you are not savvy in automotive diagnostic & repair, I would highly recommend flat-bedding the vehicle to a reputable transmission repair shop that has ASE certified transmission technicians. The reason you need to place your vehicle on a flat-bed car carrier - is to avoid serious damage to the transmission.

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This will help.

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I suggest to check description and solution details HERE.

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