2003 Chevy Tahoe 03 Tahoe 4X4 problem REPOST

Tiny
INKEDUP
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 187,000 MILES
The service four wheel drive message comes on. I have replaced the selector switch on the dash. I also replaced the transfer case control module and had it programmed by the dealer. I changed the fluids in everything. Im down to maybe a transfer case motor or a speed sensor not sure. What the main thing is when driving in 2 wheel after a block or so the transfer case kicks into neutral then I have to stop put the transmission in neutral then put it in auto 4 wheel to get to wherever im going. I got no where with a donation so now im gonna try without and see what happens.
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Thursday, July 30th, 2009 AT 12:43 PM

2 Replies

Tiny
DR LOOT
  • EXPERT
I will first apologize for the late response, I am not sure which transfer case you have? I haven't done an extensive search on what I believe your problem is, to answer your question "what the main thing is when driving in 2 wheel" , the transfer case shift control module sends a pulse width modulated (PWM) signal to an electronic motor, which is the transfer case encoder motor. This motor rotates the transfer case control actuator lever shaft, applying a clutch pack, I believe it is malfunctioning, which would cause the control actuator shaft to disengage the clutches into neutral, as you stated; "after a block or so the transfer case kicks into neutral" furthermore I am wondering how long you hold the button activated, the manual says you have to hold it for a least 10 seconds, that allows the electronic motor to fully engage. The four-wheel-drive is activated by a different servo that is probably why
you have to as you have stated; "i have to stop put the transmission in neutral then put it in auto 4 wheel to get to wherever im going." I hope I have answered your questions and if you have any more do not hesitate to contact me.
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Friday, July 31st, 2009 AT 4:23 PM
Tiny
INKEDUP
  • MEMBER
Yes it did help thank you.
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Saturday, August 1st, 2009 AT 11:13 AM

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