Question about 1997 GMC Suburban

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1997 Suburban Transfer Case stuck in 4WD Lo

1997 Suburban 4WD lights flashed for approximately 1 month. The yesterday got in it and was in 4WD Lo tried to shift into 2WD Transfer-case Module was Clicking and continued to clicking even when Keys were removed. I replaced the solenoid on Front Differential. The lights do not flash any long but still stuck in 4WD LO.

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Most likely needs an encoder motor. That is the fancy term for the motor that switches the t_case through the gears. The flashing lights indicate a code had been stored and you should have gotten it serviced then before further damage. as long as you dont drive it in 4 wheel you should still be ok

Posted on May 10, 2009

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Well it could be the selector switch, but I doubt it.
Generally, the service light means something is not working that the computer controls. Solenoids and valves are a couple of possibilities.
The transfer case is shifted by solenoids commanded by the body computer based on the switch position on the dash.
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Hi there:
That flashing is a signal from the GEM computer that indicates a failure in the Control-Trac system. Typically it is one of the Hall-effect axle speed sensors (located in the t-case) that has failed. In the auto position on your model the system monitors relative front and rear axle speeds, increasing the period of engagement of the clutch pack in the transfer case to eliminate the rear moving faster than the front. If it gets to full-lock, for example, and the rear still seems to be turning faster then it reverts the system to 4WD (locks the transfer case in 4wd as it does in 4wd-lo) and flashes the lights to tell you of the problem (in 97 and later models it reverts to 2WD in the default, auto position). Some have reported cleaning the contacts on the speed sensors has helped, but you may want to get to a dealer if the problem persists. Watch that they dont automatically try to replace the computer or the transfer case. Usually it is just a sensor problem, which is relatively easy and inexpensive to replace. There is a shift motor on the t-case on these models, but it is only used to select 4wd-lo and yours seems to do that OK.

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I'm assuming you have operated your 4WD before, and you know the tranny has to be shifted into neutral to engage and disengage 4LO (I'd try that first). Other than that they are bad for the 4wd Switches failing, (but usually one or more lights are flashing) and if its locked in 4LO you probably have a TCCM (Transfer case control module) problem. For the record there is no need to ever use 4LO, unless you are extremely stuck in the bush somewhere, there is no advantage on the street.

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My 4x4 is stuck in four wheel low it is shift on the fly and i have already replaced the transfer case motor


Ok here is a long shot but sometimes it will work. Put the 4wd position switch to 4wd Lo, put your transmission in reverse and back up for about 50 yards, stop and put your transmission in neutral, then shift the 4wd to 4wd hi, wait a few seconds and shift the 4wd to 2wd hi, Sometimes the t-case will get stuck and this is how you reset the computer. I have known people that really got their t-cases messed up because they thought that shift on the go meant that they could shift the t-case into 4wd LO while moving but shift on the go is only for 4wd hi the gears will not mesh up fast enough for 4wd LO because the ratio is 1 to 1 . I hope this helps you.

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4WD Hi does not work on 96 Chevy K1500 Suburban


we had this same problem, under the car there is a modular,near the transfer case, it just unlugs and plug a new one in.20 min.. it is approx. $80.00 item,$ 350.00 to have it done. we were in yellowstone when we had this problem. hope this helps

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4WD


Look for damaged wires, or something bent, on the Auto Disconnect Device on the front axle before you do anything else. The 4WD HI light is not coming on because the front diff is not engaging.
Re 4 LO: In 4 LO, you ar NOT getting "4 LO", what you are really getting 2WD LO, because of the output gearing of the transfer case.
In any case, your front diff is not locking in, in either mode. The A.D.D. controls the 4 Hi lite.

Oct 11, 2008 | 1997 Toyota 4Runner

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