No power to the front drive shaft in 4WD

Tiny
JORDAN55BIRD
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 260,000 MILES
Having a hard time diagnosing issues related to my 4x4. Both the front axle actuator and encoder motor on side of transfer case have been replaced and as far as I can tell my listening to them are functioning. I’ve got the electronic buttons for 4 wheel drive and they appear to be working as they should. When I put the truck into 4 hi it sounds like it engages but the front two wheels have to power to them. Same thing happens in 4 low. Is there maybe something I could check on the transfer case itself? Any helps appreciated.
Monday, September 6th, 2021 AT 10:12 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi,

Have you confirmed there is power to the front axle actuator? If so, there is a chance the transfer case control module isn't providing a ground path for the actuator.

Do me a favor. I attached diagnostics related to a front axle actuator not working. Take a look through them and let me know if it is something you are comfortable doing.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know.

Take care,
Joe

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Monday, September 6th, 2021 AT 7:57 PM

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