dpatel710

Hey Fellas,

While running my 04 CTT through its paces (testing the suspension and 4wd), it got stuck in 4lo and the 4wd faulty light came on. Since I haven't used 4lo in awhile, I ordered a used transfer case motor and put it on the car but no luck. Took the motor off and visually verified that it is moving. The car will go into longitudinal lock but won't come out of 4lo.

I put a wrench on the shaft coming out of the transfer case and was able to move it forward into longitudinal lock, but when moving it backwards to come out of 4lo, it seems stuck. Is there a way to jimmy the car back to normal 4wd? On my other truck, rocking it forward and backwards usually helps but the cayenne locks out the gear controls while the 4wd system is shifting.

Can you guys offer some guidance on how to troubleshoot this/get the car out of 4lo?

Thanks

Vivid7

this happened to Hoovsie.

Start at 3:33

dpatel710

Vivid7

The switch in the car go bad as well. That would be my next place to look.

can you reverse it for 10-15 feet, stop, put in neutral and then try it?

J'sWorld

Read you can go fast in reverse and hit the brakes.

dpatel710

J'sWorld

You have to have a PIWIS to diagnose this correctly. Good news is that the Contol Unit does not need to be coded. Just plug and play. The FSM says you need to delete the adaptation values after replacement. I have no idea what happens if you do not.

RSmass

Mine does the same exact thing, I'm about to replace the switch and control unit in mine, I did the servo motor already, stuck in 4wd low, car can only go about 35mph without the RPMs being sky high. Control unit comes today, let's see if this fixes it.

dpatel710

RSmass

Not sure if you fixed this or not yet, but I just replaced my control unit today, started up my cayenne, put it in "N" and flipped the switch back and I heard the click and saw the message "Reduction off" Cayenne is off of 4wd low and runs and drives amazing. Didn't have to replace my switch, just the control unit. They say to remove the passenger seat (tilt it back) but I found it easier to put the seat and seatback all the way forward and go from behind you will see the two modules the top one is the Control unit, a bolt (I think 10mm not sure) holds it in, and can be easily removed with a wrench. Took me 5-10 minutes to swap.

dpatel710

Good to hear!

I’m waiting on the parts in the mail, thanks for the tip!

dpatel710

J'sWorld

Win.

nodoors

That is an interesting failure mode. Glad it was a simple fix. Are you going to open the old module to see what you can see? Would love some pictures.

dpatel710

I chucked the old module before seeing this, sorry!