4x4 Switch Flashing 4WD works - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


GMC/Chevrolet Truck/SUV When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 02-01-2014, 10:36 PM   #1
Junior Member
Thread Starter
 
Join Date: Feb 2014
Posts: 9
Thanks: 0
Thanked 1 Time in 1 Post
ssr429 is on a distinguished road
Default 4x4 Switch Flashing 4WD works

I have a 99 Silverado. When going from 2wd to Auto, 4hi or 4low, the 4wd will engage and work, but the 4hi, 4low or Auto 4wd button will continue to flash. Could this be the switch on the dashboard? Has anyone else ever had this issue? Thanks!
ssr429 is offline   Reply With Quote
Old 02-02-2014, 09:24 AM   #2
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

thats a new one, normally when they blink either the solenoid in the diff or tcase is not working
jwfirebird is offline   Reply With Quote
Old 02-02-2014, 02:40 PM   #3
Junior Member
Thread Starter
 
Join Date: Feb 2014
Posts: 9
Thanks: 0
Thanked 1 Time in 1 Post
ssr429 is on a distinguished road
Default

Yes, it'* very odd. Today the button stopped flashing and went solid after a few minutes of being in 4wd. From that point, it started working normally. No 4wd service light either. I'm just glad the 4wd works.

Last edited by ssr429; 02-02-2014 at 02:41 PM.
ssr429 is offline   Reply With Quote
Old 02-02-2014, 02:46 PM   #4
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Quote:
Originally Posted by ssr429 View Post
Yes, it'* very odd. Today the button stopped flashing and went solid after a few minutes of being in 4wd. From that point, it started working normally. No 4wd service light either. I'm just glad the 4wd works.
Has their been a drastic change in temperature outside since you experienced the first issue?
Mike is offline   Reply With Quote
Old 02-02-2014, 04:28 PM   #5
Junior Member
Thread Starter
 
Join Date: Feb 2014
Posts: 9
Thanks: 0
Thanked 1 Time in 1 Post
ssr429 is on a distinguished road
Default

Yes, I would say so. I purchased the truck in December, 2013. Since then, it'* gotten a lot colder (in Wisconsin) and we've a had a lot of snow. The truck stays in my garage when I'm not at work though. Today, I went ice-fishing and put it in 4wd once on the lake. It went into 4wd right away but the button continued flashing for a few minutes, then went solid (staying in 4wd). Once off the ice, I switched it from 4wd to 2wd, then to auto 4wd. I worked flawlessly then. I did take the switch panel out today, unplugged it and plugged it back in to see if that would make a difference.
ssr429 is offline   Reply With Quote
Old 02-02-2014, 05:10 PM   #6
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

The flashing then going solid is an indication that when something is engaging, its slow. Like Justin said, its either the front diff or transfer case solenoid. If your setup is like our S10'* and Blazers, I'm going to lean towards the typical faulty vacuum modulator or just a cold front diff.

When was the last time the front diff oil was checked?
Mike is offline   Reply With Quote
Old 02-02-2014, 05:58 PM   #7
Junior Member
Thread Starter
 
Join Date: Feb 2014
Posts: 9
Thanks: 0
Thanked 1 Time in 1 Post
ssr429 is on a distinguished road
Default

I just checked it and added about 8oz to it yesterday. Drove to work today and tested the functionality. It worked like a charm.
ssr429 is offline   Reply With Quote
The Following User Says Thank You to ssr429 For This Useful Post:
Mike (02-02-2014)
Old 02-02-2014, 06:05 PM   #8
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Outstanding, that'* good to hear.
Mike is offline   Reply With Quote
Old 02-02-2014, 07:40 PM   #9
Junior Member
Thread Starter
 
Join Date: Feb 2014
Posts: 9
Thanks: 0
Thanked 1 Time in 1 Post
ssr429 is on a distinguished road
Default

Yeah, I hope it'* not short lived. Now to clear these two engine codes...P0171 and P0174.
ssr429 is offline   Reply With Quote
Old 02-03-2014, 08:09 AM   #10
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

no vacuum crap on the full size ones fortunately, they are electronic solenoids. which will work better when warmed up if they are getting older.
jwfirebird is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Service 4WD light phwe9774 GMC/Chevrolet Truck/SUV 10 06-03-2014 08:33 PM
4wd light comes on. Rickybobby1985 GMC/Chevrolet Truck/SUV 3 03-04-2014 10:19 AM
2002 Suburban 2500 4WD roar? karnor GMC/Chevrolet Truck/SUV 6 07-25-2013 04:35 PM
2001 Chevy Blazer 4wd 4.3L V6 JonAllen Introductions for new members 10 08-05-2011 10:14 PM
What is 4WD or AWD? PRD2BDF Lounge 14 03-28-2006 12:13 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:38 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.