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10-10-2012, 12:21 PM #1
- Join Date
- Oct 2012
2005 silverado service 4wd message
Hi guys, I have a 2005 z71 and until now (172,000 miles) it's been a great truck besides a transmission rebuild at 100k and now the service 4wd message is on and won't go off, and none of my buttons on the left side are lit up. It started just doing it every now and then And now it's constantly on. I tried all the tricks I used on my two previous z71's (an 03' and a 99') but its not working, tried starting and restarting, disconnecting battery, all of the above, do y'all think it could be a bad connection or an actuator, if so how do I find out? My scanner is only picking up 02 sensor codes which is the least of my worries lol any input would be greatly appreciated bc without 4wd in my line of work I'm screwed
11-23-2012, 01:28 PM #2
- Join Date
- Nov 2012
- Akron, Co
Look into changing your transfer case motor you will need to know your vin code and its pretty simple its three bolts and a wiring clip, had the same problem on my 2004 silverado.
11-23-2012, 06:05 PM #3
what you need to do is have the GM drive train codes pulled with the scanner having this ability . then post what the code[s] are.
it can be many things causing this. check fuses. It is not uncommon to have the small wires to the transfercase break. the feedback sensor in the encoder is also a problem. could also be the transfercase is stuck.
codes will reveal the area of failure. you may have to go to the dealership of the local tranmissiom shop.
11-27-2012, 07:54 PM #4
I had this same message come up last weekend. I had backed up a steep, slick, grassy slope to load up while helping my son move out of his apartment. After spinning the rear wheels a little I switched to 4WD for a few feet. After loading up, I switched back to 2WD and noticed the message. I acknowledged it and it disappeared, hasn't come back - even though I had to duplicate the procedure again later that day.I continue to lie to myself because I'm the only one who still believes me. - Vermin
11-28-2012, 08:21 AM #5
11-28-2012, 09:13 AM #6
the encoder has feedback circuits that report the encoder position. if not correct you get a message. best check the fluid color make sure it is blue. if dark/grayish replace now to avoid any more damage.
when switching into 4wd or out give the vehicle some time to complete operations before heavy loading up of the drivetrain.
11-28-2012, 09:54 AM #7
I would start by crawling under the truck and unplugging and reconnecting connectors on and around the transfercase. The same thing happened in my 03. I played with the connectors and the light went off and never returned. I do agree with everyone else though the encoder motor on them are a known issue. But, you might gert lucky and have a corroded connection
1995 Silverado 4x4
6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge
2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
2002 Silverado ext cab 2wd (Sold)
2003 Yukon XL (Totaled)
11-28-2012, 10:21 AM #8
Sometimes the cause is as simple as the switch on the dash... I have the same problem, but never looked into it because until 2 weeks ago, it would only turn on randomly, and if I shut the truck off, and then back on, I was able to shift into / out of 4wd... But now I can only get it into Auto 4wd once in a while... So I gotta fix mine now too... Let me know what you come up with.00 Chevy Tahoe LT, 5.3 4x4
11-28-2012, 06:36 PM #9
those encoder signal wires are very small and break easy. I know of one case where an owner was too hard on the wire harness on the driverside fuse box when changing spark plugs . he broke a wire . that wire was the encoder brake wire.
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