4x4 shifting with key on

[Jacob Nagy]

I have an 07.5 silverado 1500 with a 5.3 in it.

 

Everytime I turn the key on the encoder motor tries to shift into a different gear. I have changed the encoder motor, the dash switch, and made sure the front actuator works. None of those seemed to have fixed the issue.

 

It throws a C0398 DTC which when I google it everything says it could be virtually anything.

 

I have looked through so many forums and articles but can't find anything so I'm posting here to hopefully get some help.

[newdude]

1 hour ago, Jacob Nagy said:

I have an 07.5 silverado 1500 with a 5.3 in it.

 

Everytime I turn the key on the encoder motor tries to shift into a different gear. I have changed the encoder motor, the dash switch, and made sure the front actuator works. None of those seemed to have fixed the issue.

 

It throws a C0398 DTC which when I google it everything says it could be virtually anything.

 

I have looked through so many forums and articles but can't find anything so I'm posting here to hopefully get some help.

 

 

There is a position sensor on the back of the t-case that monitors what range its shifted in.  If that failed it can cause the C0398.