Transfer Case Encoder Motor

[RRR18]

What a pain this thing is! Changing the part no problem at all. Finding out that it is the problem ! My bad Transfer Case Encoder Motor on my '03 Z71 (92K) caused unbelievable problems.
1. Made the lights on push button case switch go crazy. Blink or just plain went out.
2. Stalling.
3. A/C cycled in and out over and over.
4. No power at all. Foot to floor....25 miles an hour.
5. Shift patterns way outta wack. Wouldn't downshift either.
6. Obviously had no 4WD and SERVICE 4WD code popped up.
After all that and a very smart mechanic that I know and about 4 hours making sure there wasn't anything else wrong with any part of the truck the Encoder Motor was found to be the only culprit. Truck threw out 4 codes with one being the CO 327 Encoder Circuit Malfunction. Most of time spent was to make sure the truck didn't have multiple problems so that we were't just throwing parts at it. Changed the part and EVERYTHING back to normal!
Thank god for really smart computer mechanics. Just thought I'd share...maybe it'll help someone sometime.

[usmcchevy]

Interesting, glad ya got her fixed.

[jonzcustomshop]

this should be a sticky!

chased down a bunch of info, and it seems that this is a very common problem...!

been doing lots of google searches to see how to replace this part, 2005 silverado..
is there anything special I should do, or is it just a simple remove and replace?

[RRR18]

Not simple as remove/replace. After part is changed it has to be programmed to the trucks computer.
Posted via Mobile Device

[shade67]

They used to sell the encoder itself- you removed the shift motor and split it's case and replaced it- now you buy the rebuilt shift motor and replace it - I've never had to reprogram anything just make sure t-case is in neutral before reinstalling shift motor and the shift motor slides uptight to t-case before tightening or it'll break, hook up the connector and turn on the key- should show light by the "n" push 2wd and shift trans to neutral and it will shift!