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Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 16027
Experience:  Have owned a repair shop for 25 yrs.
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2003 Chevy Silverado 1500 4WD 4x4 Transfer Case Motor Encoder

Customer Question

2003 Chevy Silverado 1500 4WD 4x4 Transfer Case Motor Encoder Ring Sensor- Could this cause the switch on the dash to randomly put the truck in 4WDL, or 4WDH? When I turn the truck off I’m in 2WD, then if I go to start the truck the switch indicates truck is in a different gear then I left it in. I replaced the switch thinking it was bad, but that didn't make a difference. Could it be the encoder ring sensor? I already put a new transfer case on in June of 2009. Please help spending money left and right and still not fixed.
Submitted: 5 years ago.
Category: Chevy
Expert:  Tim's Auto Repair replied 5 years ago.
did it do this before you replaced the transfer case?
Customer: replied 5 years ago.
Yes I did. The work was done at a transmission shop.
Expert:  Tim's Auto Repair replied 5 years ago.


to me,this sounds as if your problem may be the transfer case control module,,,sense it will shift by itself,it doesnt seem to be the sensor


Please ACCEPT my answer by clicking the accept button, so I can get credit for my work.i don't receive commission unless you do ..I'm not always going to be giving you good news,so please don't let this stand in the way of you accepting my does not cost you more money.we will still be able to communicate.please understand,i can not see,hear or touch the vehicle and only know what you tell me. Bonuses and positive feedback are appreciated!if you are not satisfied with my answer,please do not leave bad feed back,i will gladly opt out and let another expert handle the question.if i have sent any diagrams,please print them.they will only stay on here for an hour or so.PLEASE ASK IF YOU NEED MORE HELP

Control Module, Transfer Case


Transfer Case Control Module Replacement

Transfer Case Shift Control Module Replacement

Removal Procedure


  1. Disconnect the shift control module electrical connectors.



  1. Unsnap and remove the shift control module from the bracket.

Installation Procedure


  1. Install the shift control module to the bracket.



  1. Connect the shift control module electrical connectors.
  2. Start the engine and test the automatic transfer case system for proper shift operation.