Question about 1997 GMC Sierra

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97 GMC Sierra electronic 4x4 problem

My electronic 4x4 is not working. Alls it does is flash, and the t-case engages like it goes into 4x4, but when jacked up the front tires dont spin the the 4HI light is still blinking. So I installed a brand new 4x4 actuator, nothing, checked the wires and theres no power being sent to them. Installed a new 4x4 switch in the dash panel, still nothing. It is the updated 5-PIN actuator. I was told it could be the TCC ECM, or something like that. Its located behind the glove box. But I am not 100% sure if that was the parts name. I was wondering if anyone knew what this part is and where it is located

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  • 372 Answers

Check the vacuum lines for cracks bend them a little when doing so to expose any hidden cracks make sure the end is on good.

Posted on Apr 18, 2017

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Posted on Jan 02, 2017

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SOURCE: 97 gmc sierra won't go into 4x4. Electronic

Take the front axle actuator out of the axle. Plug it back in and have some one push the 4x4 button. The actuator should move, it's a liniar motor. If it doesn't then the actuator is bad or there is a wiring problem. If it does there is a problem in your front diff or some where else in the system.
I'd take a guess and say it's the front actuator.

Posted on Oct 11, 2009

  • 2187 Answers

SOURCE: 1997 GMC Sierra Z71 4x4

Usually it is the front actuator for the front axle that usually goes bad. You may need to check if there is activity with the actuator when you engage the 4x4. See if there is power to the actuator for it to actually engage.

Posted on Aug 22, 2011

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When it is in 4x4 check and see if you can turn the front drive shaft. If you can the problem is in the front end. If you can't the problem is in the trasfercase.

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Have a gmc 2005 sierra the 4x4 doesn't work. when I press the 4x4 button blinks a few times,and then makes like grinding sounds,it sounds that is coming from transfer case,but never engage and ligth goes...


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97 gmc sierra won't go into 4x4. Electronic


Take the front axle actuator out of the axle. Plug it back in and have some one push the 4x4 button. The actuator should move, it's a liniar motor. If it doesn't then the actuator is bad or there is a wiring problem. If it does there is a problem in your front diff or some where else in the system.
I'd take a guess and say it's the front actuator.

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1 Answer

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1 Answer

1996 Yukon 4X4 Electronic Shift on Fly.


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