Question about 2003 GMC Sierra

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Truck says to service 4 wheel drive, the fluid has been changed.

Truck says to service 4 wheel drive, and then the electric transfer case switch goes blank, and no 4 wheel drive is possible. Fluids have been changed on regular basis. Don't use the auto function much, or 4 wheel drive for that matter. Any suggestions?

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The 4 wheel drive actuator motor is not working, that is why the message, they stick if they are not used very often.

Posted on Dec 15, 2008

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1 Answer

2003 Silverado 4WD. Service 4WD dash light comes on after engaging 4WD and acts up by engaging itself randomly for several days, then goes back to normal.


Check connection at the 4X4 control module , check power and grounds . Do you know how to do basic electrical testing ? Does your truck have manual or automatic trans mission ? Which transfer case does yours have ?

The NVG 263 transfer case features a three button shift control switch located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module (TCCM) starts monitoring the transfer case shift control switch to determine if the driver desires a new mode/gear position. At a single press of the transfer case shift control switch, the lamp of the new desired position begins flashing to inform the driver that the TCCM has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria has been met and the new mode/gear position has been engaged. Once the new mode/gear position is fully active, the switch indicator for the new position remains ON constantly. In the event that the TCCM can not or will not complete the shift, the indicator returns to the previously selected position; this is a Transfer Case Shift Control Switch Indicator Flashes, then Returns to Previous Mode condition.

The NVG 263 transfer case provides the driver with 4 manual mode/gear positions:
• 2HI - 2 Wheel Drive high range
• 4HI - 4 Wheel Drive high range
• 4LO - 4 Wheel Drive low range
• Neutral
Have it check for DTC'S - diagnostic trouble codes ?

DTC B0790
DTC B2725
DTC C0306
DTC C0327
DTC C0359
DTC C0379
DTC C0550

Your best bet would be take it to a qualified repair SHOP

Dec 28, 2016 | Cars & Trucks

1 Answer

When I shift manual shifter from 4 wheel drive back to 2 wheel drive, truck does not want to return to 2 wheel drive. Dash light goes off as expected. No service light comes on. I did put truck in reverse...


Just to confirm, you don't have an electrical 4WD selector; you have to move a shifter on the floor of our cab? If that's the case, I'd suspect that you have a linkage misalignment or malfunction that doesn't allow the 4WD selector to completely return to the 2WD position. Putting the truck into reverse and back to drive probably causes a jolt to the 4WD linkage which disengages the transfer case from the driveline. Check for slack or binding in the transfer case shift level linkage (clean and lube the linkage won't hurt).

Oct 03, 2013 | 2006 GMC Sierra

1 Answer

Is doing a transmission flush the same as changing the differntial fluid?


No, a transmission flush replaces the fluid in your transmission. A diff. service would replace the fluid in the rear end also the transfer case and front diff. if you have a 4 wheel drive truck.

Nov 20, 2012 | 2002 Toyota Tacoma

1 Answer

My 4 wheel drive will not engage and the 4 wheel drive service light does not come on. what could be the problem/


check your four wheel drive fuse.if its ok.check for vaccum to your transfer case switch if it is vaccum operated.if it is electrical check for b+ at the transfer case switch.if there ok check for b+ at the front axle acctuator.if its ok it is probably your transfer case module.

Jan 24, 2011 | 2000 Chevrolet Blazer

1 Answer

Four-wheel drive not working. No light on swtich. New transfer case motor. Checked the fuses and the four-wheel drive switch. What can it be?


Was the transfer case fluid changed every 50K miles? This very important on these trucks. The Transfer Case Control Module (TCCM) could be at fault, especially since you have no lights on the selector switch. Is the Service 4x4 light on? When you switch from 2H to any of the 4 wheel drive selections, do you hear any actuator noises coming from under the truck?

Dec 07, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

My 2001 silverado w/69,000 miles has no light indicating 2 or 4 h


THE TRANSFER CASE MOTOR IS NOT WORKING TO INGAGE 4 WHEEL DRIVE. CHECK WITH DOOR OPEN WHEN YOU PUSH 4 WHEEL SWITCH YOU SHOULD HEAR MOTOR INGAGE 4 WHEEL DRIVE. IF YOU HEAR MOTOR BUT STILL NO 4 WHEEL DRIVE THE GEAR ON MOTOR COULD BE DAMAGED. REPLACE TRANSFER CASE MOTOR.

Jan 08, 2010 | 2001 Chevrolet Silverado 1500

1 Answer

I have an intermittent grinding/metal spining sound that goes away the moment the 4 wheel drive is engaged. Sounds like a free spinning hub partially engaged??? Have had the wheels pulled, front drive...


WELL WHAT YERA IS THIS TRUCK AND IS THE SOUND COMING FROM FRONT OR IS COMING DOWN DRIVE LINE IT COULD BE AT TRANSFER CASE THAT WHY IT GOSE AWAY WHEN IN FOUR WHEEL YOU COULD PULL THE DRIVE LINE IN FRONT AND SEE IF NOIS GOSE AWAY THEN ITS IN FRONT IF ITS THERE WITH DRIVE LINE OUT PUT IN GEAR AND IF NOIS GOSE AWAY THEN ITS THE TRANSFER CASE

Sep 21, 2009 | Ford F-150 Cars & Trucks

3 Answers

What kind of oil do I put into the transfer case? Is that why the computer keeps saying check 4 wheel drive?


no, DO NOT use gear oil. The transfer case uses the same type of automatic transmission fluid that the transmission uses. Is the display saying "service 4x4 switch"? If so it is common and the 4WD indicator light switch is bad and needs replaced. It's only purpose is to tell the driver info center what 4 wheel drive mode the transfer case is in. This switch will not affect the function of the 4 wheel drive. The correct fluid for the transfer case is +4 automatic transmission fluid.

Jul 18, 2009 | 1993 Jeep Grand Cherokee

1 Answer

My transfer case is permanently engaged but no 4 wheel drive...


2 common problems that cause this are the vacuum switch on the transfer case and the vacuum actuator mounted under the battery tray. When the switch on the transfer case goes bad it pulls fluid out of the transfer case and pumps it into the actuator and destroys it. The switch only costs about $15 and are usually stocked at major auto parts stores. The actuator ranges from about $50 to $120 and most of the time need to be ordered. If you reach under the battery tray with the 4wd engaged and follow the cable you will feel the end of the actuator, make sure that it is pulling back. If not either the switch or actuator or both are bad. Hope this helps.

Jan 08, 2009 | 1999 Chevrolet Blazer

3 Answers

Can,t get truck out of 4x4 low range


try putting your truck in neutral and then shifting into 2 wheel drive shift on the fly does not apply to 4 low only 4 high and on electric shift models it wont shift unless your ****** is in neutral.

Aug 26, 2008 | 1999 Ford F250 Regular Cab

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