my 2005 GMC z71 would blink in 4wd and would go rite back into 2wd


Asked by Jan 09, 2014 at 08:00 PM about the 2005 GMC Sierra 1500

Question type: Maintenance & Repair

it would eventually go in after I drove it 20 miles or so, but it now does not at all blink in 4wd and a service 4wd message has appeared I have checked the switch and ive replaced the actuator none of them solved the problem please help

14 Answers


This has a module in behind the switch for the 4x4. I have replaced several for this concern. You will have to take it out and match the # to get a new one.

Best Answer

it will be behind the push buttons for the 4wd I the cab?


Is your push button on drivers side on the left of dash?


driver side. has auto 2wd, 4wd hi, 4wd low, in that order.


Yes,pull the switch and it is in behind down inside.It can be a bugger to change.


alright well I just polled my whole dash apart on the driver side and all I could see was an empty space I didn't see any modules


They have moved it then. Let me check and I'LL GET BACK.


ide appreciate that thank you, what does the module do anyway


It is still there in the same spot but hard to see. Crawl under the dash and look back UP towards the firewall.It's not very big. It receives signal from the switch to engage the transfer motor.


is it possible to show a picture because I just got under the dash and there was a lot of wires and stuff lol and I tried to fallow the wires from the switch to the wherever but I couldn't find anything


It is there, just harder than heck to see and get to. Look down in the dash on the left side and you can see just the edge of it.Look towards the door but down in the dash.


is it close to the fuse box inside the truck


Above it


ok im going to check it in the morning I appreciate all your help

Your Answer

Add photo

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