Question about Cars & Trucks
4 wheel drive message display
Posted by Anonymous on
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Posted on Jan 02, 2017
I had this light come on in my 2003 tahoe it ended up to be the transfer case motor (encoder motor) was bad. I got one out of a used part store and the light went off right away.
Posted on Apr 26, 2009
On the full size, the front actuator is electric, not vacuum. So check the fuse.
When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.
Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, check the transfer case switch and the power feed to the transfer case. I'll assume it is the actuator, if the plug to the actuator is not getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD, with out the 12 volts you have 2WD.
GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.
If I were you, I would buy a new heated actuator. They are available at most auto parts stores, and are about $90. They are also on eBay for about $55 plus shipping. These are very easy to change - just thread out the old one, and thread in a new one.
Good luck, That actuator is usually the problem 90% of time but check the fuse to the 4X4.
Posted on Dec 24, 2009
I had a similar problem with
the Service 4 Wheel Drive light which came on intermittently then became more
consistent in the message center display. It would go into 4 wheel drive if the
message center did not display the Service 4 Wheel Drive message in the message
center, but not when the message was displayed. I found the transfer case
switch module in the dash was defective, and it has been working with no other
problems for three years.
Posted on Jul 22, 2010
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