Question about GMC K1500

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4wd issues!!! When I start the truck, all 3 lights( 2hi 4hi and 4lo) flash once on the switch then go off ( all of them). It drives just fine but is in 2wd. When I push any of the buttons the 4hi and 4lo flash, the tccm clicks, but remains in 2hi with no indicator light on on the switch. I ran the codes by grounding out pin 13 and it flashed twice which means that it is an encoder fault so I replaced the encoder motor erased the stored codes and still the same result.

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THE 4WD SWITCH IS A PROBLEM. ALSO THE GROUND CONNECTOR ON THE FRAME CLOSE TO THE DRIVERS DOOR IS A PROBLEM. IT USUALLY HAS A COATING OF THE UNDERCOAT MATERIAL ON THE FRAME THAT IS NOT REMOVED BEFORE THE CONNECTORS ARE PUT IN PLACE.

THERE ARE 2 BOLTS THERE THE OTHER IS AN ABS GROUND CLEAN OFF THE UNDERCOATING FIRST, PUT DIELECTRIC GREASE ON THE CONNECTION POINTS, THEN COVER THEM IN SPRAY ON UNDERCOATING. THIS IS A CHEAP FIX TRY IT FIRST.

RATE ME PLEASE.

Posted on Jul 24, 2009

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Posted on Jan 02, 2017

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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


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


?€¢
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?€¢
N - Neutral, 4 wheel


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?€¢
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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