2002 Avalanche Z-71 4WD issue

[SunShine01]

Hello fellow Chevy owners. I own the above listed Avalanche. I keep it @ my hunting lease to use filling feeders and hauling bags of corn. It gets very wet and muddy during that season. It’s a drought now.

 

My issue is, I’ve been experiencing issues of it dropping into 4WD low. It drops into any other Auto 4WD and 4WD Hi.

 

Here is what I’ve recently discovered. My dashboard shift indicator, when shifted to neutral to engage the 4WD does not illuminate. When it momentarily DID illuminate, it engaged into 4WD Lo !

 

Now it’s stuck in low. Can’t get the neutral position to illuminate. Drive, And reverse illuminate and park intermittently does.

 

My question is, being this is an electronic shifting system, is my electronics telling my transfer case it is NOT in neutral therefore won’t drop into Lo or out of Lo ?

 

If so, what is the module part that is responsible for this dashboard indicator ? I might as well replace it. Already replaced the 4WD switches, and was thinking of the module that mounts outside on the tranny thinking it got wet ? That part is a $250 part so if I can try something less, I win, and this observance I discovered opened my eyes.

 

I did notice recently this year, this shift indicator not fully illuminating. I got all my shifts but not my 4WD buttons linking to it.

 

Any advice from experience would be greatly welcomed.

 

Thanks in advance

Mike

 

 

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[04z71crew]

Hi Mike, 

 

I had a similar issue with my 2004 silverado. I pulled the encoder motor from the transfer case and replaced this sensor and it fixed my problem instantly. Mine would sometimes start in 4wd, try to shift into 4wd on its own and get stuck in 4wd low or high. https://www.amazon.com/Dorman-600-120-Transfer-Motor-Encoder/dp/B004GBAPC2/ref=asc_df_B004GBAPC2/?tag=hyprod-20&linkCode=df0&hvadid=312429177733&hvpos=1o2&hvnetw=g&hvrand=15610581697995138023&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9026252&hvtargid=pla-569794969089&psc=1

 

If that doesn't fix your problem it could be your transfer case control module. I would start with the sensor. 

 

Gavin

[SunShine01]

Hi Mike, 
 
I had a similar issue with my 2004 silverado. I pulled the encoder motor from the transfer case and replaced this sensor and it fixed my problem instantly. Mine would sometimes start in 4wd, try to shift into 4wd on its own and get stuck in 4wd low or high. https://www.amazon.com/Dorman-600-120-Transfer-Motor-Encoder/dp/B004GBAPC2/ref=asc_df_B004GBAPC2/?tag=hyprod-20&linkCode=df0&hvadid=312429177733&hvpos=1o2&hvnetw=g&hvrand=15610581697995138023&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9026252&hvtargid=pla-569794969089&psc=1
 
If that doesn't fix your problem it could be your transfer case control module. I would start with the sensor. 
 
Gavin

Thanks Gavin.

Mine doesn’t have a mind of its own and tries to shift where it wants.

It just won’t shift where I direct it to shift all the time and I noticed the illumination issue to be possibly related ? Not sure, but when it illuminated, it did drop into 4 low.


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