Siverado 2500 hd 2001 truck stuck in 4lo. reset got it to 2hi. then when i hit 4hi it wont go and when i put trans in n it locks in 4lo again. when u hit button to switch, it blinks and tries to do it for a sec then gives up and back to 4lo. do u think its the transfer case shift motor?

I guess you probably don't know what transfer case you have ?
SERVICE 4WD
Refer to
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Transfer Case Description and Operation in Transfer Case - NVG 149-NP3

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Transfer Case Description and Operation in Transfer Case - NVG 246-NP8

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Transfer Case Description and Operation in Transfer Case - NVG 261-NP2

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Transfer Case Description and Operation in Transfer Case - NVG 263-NP1

The NVG 246 EAU provides 5 modes, Auto 4WD, 4HI, 4LO, 2HI and Neutral.
The four manual mode, or range gear positions, of the NVG 261 transfer case are:
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2HI - 2 wheel drive high range

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4HI - 4 wheel drive high range, part-time

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4LO - 4 wheel drive low range, 2.72:1 gear ratio reduction

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N - Neutral, 4 wheel

The NVG 263 transfer case provides the driver with 4 manual mode/gear positions:
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2HI - 2 Wheel Drive high range

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4HI - 4 Wheel Drive high range

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4LO - 4 Wheel Drive low range

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Neutral

With the info I've given you ,you should be able too now !
There is probably a code stored somewhere !
DTC B0790 DTC B2725 DTC C0300 DTC C0305 DTC C0306 DTC C0321 DTC C0327 DTC C0359 DTC C0374 DTC C0379 DTC C0550.

Put truck in Neutral while key in run position engine off or on (doesn't matter which). If it's pushbutton 4wd then try hitting 4low again. if that doesn't work some of the chevy trucks required you to press 4hi to get into 4high and then press 4hi again to get back to 2hi, unless yours has a 2hi button. In that case press 4hi to get into 4high and then press 2hi to get back to 2wd. either way you need to be in neutral to get out of 4lo. I have shift on the fly (Mechanical Shifter on floorboard for transfer case) on my 1990 Suburban and still have to put it in neutral to get out of 4lo. Good Luck.

Gm makes lots of different trucks with lots of different engines using lots of different transfer cases. How about not keeping all that info a secret

this all prove that engine and transmission co-ordination seems to be poor.

1. check accelerator sensor.
2. " accelerator pedal--transmission ctrl liver.
3. " transmission oil level.
4. " proper grade of transmission oil.
5. " pressure ctrl walls

• Shifting from 2HI to 4HI Press and release the 4HI button. This can be done at any speed, and the front axle will lock automatically.

• Shifting from 4HI to 2HI Press and release the 2HI button. This can be done at any speed, and the front axle will unlock automatically.

• To shift from 2HI or 4HI to 4LO, the vehicle must be stopped or moving less than 3 mph with the transmission in NEUTRAL

• Hope this helps.

You should be able to put in 4x4 while in drive less than 35mph. Mine had a switch to turn to engage or dis-engage.

you need to replace the encoder motor and 4wd control module

Replace the selector switch assembly. Common failures.

A good ground is very imporant on these vehicles

it is either the control switch or the actuator. look if light is flashing on push button switch. if so it is stuck. you can check actuator on front axle, to watch and see if it is moving.