Engine shuts off when shifting into four wheel drive

Tiny
DAVID SKATES
  • MEMBER
  • 2004 GMC SIERRA
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
When I shift my truck into four wheel drive it shuts off my engine. I do not know what is causing this. Also, does the propeller shafts going to the front wheels stay engaged all the time even when not in four wheel drive? Thanks in advance for helping me on these questions.
Sunday, June 3rd, 2018 AT 3:17 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Hello,

It sounds like you have a transfer case encoder that is shorted out. Here is the location of the part please unplug it and try the four wheel drive button to see if the engine still stalls. If the engine stays running replace the encoder.

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
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Tuesday, June 5th, 2018 AT 9:56 AM

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