Question about 1992 GMC Sonoma

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4WD not working properly Stuck in 4lo will not shift out to 4 hi or 2 wheel drive

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It's probably your transfer case. If not used very often, they tend to seize up. If used alot, may be in need of replacement or oil needs replacing. I believe they take about 1.5-2L of auto trans fluid. Check the fluid level first, by removing the fill plug (big plug at top) and sticking your baby finger in and bending it down. If it's full, the fluid level will be right at the bottom of the plug.
It it's not, try adding some until it starts to run out of the hole, then replace to the plug.
To change the fluid, remove the fill plug first, then the drain plug and let it drain. Replace the bottom plug, fill (like discribed above) then re-install the top plug.
Always remove filler plug (top) first, then drain plug (bottom) because they can be a real bugger to remove and if you remove the bottom one and can't remove the top plug, you're screwed.
Check and add fluid if necessary, then try to shift gears before going through all of the other stuff because low fluid level can cause your problem but check on the right type of fluid first. Adding the wrong fluid can cause expensive problems. A fluid change would be beneficial, especially if you off-road because you'll get water in the oil and it does damage after awhile.

Posted on Apr 12, 2009

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Circuit Description

The indicator lamps circuits consist of 5 individual lamps contained inside the mode/range switch assembly, they are AUTO, 4WD, 2HI, 4HI, 4LO and NEUTRAL. The AUTO, 4WD, 2HI, 4HI, and 4LO lamps are contained inside their respective range button. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current limiting driver.
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Error message repair 4wd


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


?€¢
Transfer Case Description and Operation in Transfer Case - NVG 246-NP8


?€¢
Transfer Case Description and Operation in Transfer Case - NVG 261-NP2


?€¢
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:
?€¢
2HI - 2 wheel drive high range


?€¢
4HI - 4 wheel drive high range, part-time


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


?€¢
N - Neutral, 4 wheel


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


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.

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@ 2000 gmc: Exactly right.

asker: Also, it helps if you're rolling at about 2 mph with the steering wheels straight.
You cannot shift into 4LO with the wheels turned or when in a drive
gear. Also, it may be that you need the electric shift unit serviced.
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