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Check light on code U0101 2008 chev tahoe

4 wheel drive message display

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SOURCE: code P1441 check engine light

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SOURCE: 1999 chev blazer 4x4 system

I have a 1999 chevy blazer that stuck in 4 wheel drive. How do you get it out.

Posted on Dec 18, 2008

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SOURCE: 2003 chevy tahoe service 4 wheel drive on

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

Molson02536
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SOURCE: 1999 tahoe 4 wheel drive trouble light is on. Wont go into 4

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

  • 396 Answers

SOURCE: 1999 chevy silverado service 4 wheel drive light

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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4 wheel will not work. the selector switch will show it is in but front tires will not engage No messages on control center


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Dec 25, 2015 | Chevrolet Cars & Trucks

2 Answers

Why won't my Tahoe shift into 4 wheel drive


The most common issue is the encoder motor on the the transfer case.

Oct 18, 2014 | 1997 Chevrolet Tahoe

1 Answer

Tahoe troubleshooting


look under the vehicle for any loose wires that may have ripped loose when getting out of your original predicament.. mostly near the bottom of the transmission/transfer case..

Dec 25, 2013 | Cars & Trucks

2 Answers

1999 chevy silverado service 4 wheel drive light


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.

Jul 16, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

1992 chev blazer tahoe lt.. 4 wheel drive worked last year. Tried to engage it this year for first time and would not go into 4Lo or 4Hi. Was in neutral. Start vehicle and green light on 4wheel option...


not a fuse if you have power to switch,if your 4wheel light does come on and is not blinking,check the little motor on the transfer case,tap it while someone tries the switch,it might just be stuck from not being use,if it doesn't free its self you may need to replace it.

Dec 26, 2009 | 2001 Chevrolet Tahoe

1 Answer

4 Wheel drive not functional


There is a TSB on this problem: TSB #03-04-21-001C

Subject:4WD Switch Indicator Lights Flashing, 4WD Inoperative, DTCs C0327, P0500, P0836, P1875 Set (Replace Encoder Motor Sensor, Reprogram TCCM, Inspect Front Drive Axle Engagement Sleeve for Damage/Repair) #03-04-21-001D - (12/04/2003)



Models:2003 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2003 GMC Sierra, Yukon, Yukon XL
with 4WD and Electric Shift or Active Transfer Case (RPO NP1 or NP8)
You can also try removing the TREC fuse (engine fuse box) and reinstall after 30 seconds. Look up the TSB number I gave you and you'll find alot more information.

Dec 16, 2009 | 2003 Chevrolet Tahoe

1 Answer

4 wheel drive selector switch lights go off and when they come back on the tahoe is in 4 low 2004 Chevy Tahoe Z-71 Sometimes the switch will show to be in Neutral. We have already replaced selector switch!


new doesn't mean good, scan the computer for codes and use that code trouble tree.may have wires chewed into and touching from rodents check wires very closely on top of trans. not normal for the dash switch to short out either. may need to replace the contol module and reprogram hope this helps.

Dec 06, 2009 | 2004 Chevrolet Tahoe

1 Answer

Service 4wheel drive light on (dashboard)can I change out the fluid? after driving just a couploe of miles the service light comes on.Took a sample of transfer case fluid and can't quite tell...


The service 4 wheel drive light is indicating a part failure in the 4 wheel drive system.
Take your vehicle to your local Auto Zone or Advance Auto Parts and ask them to scan your Tahoe for trouble codes. The code will help to determine what the component failure is and you can start diagnosing at that point.
Write the code down and reply back, we can go from there.
Good luck.
Regards,

Sep 08, 2009 | 2000 Chevrolet Tahoe

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