Question about 1999 GMC Jimmy

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99 gmc 4wd switch seems to only work when it chooses too.

I rarely use my 4wd switch but it seems as if when i need it the most it won't work. push the button,nothing happens. Eventually it will light up and properly engage. However when it becomes time to return to 2high it seems to be the same result. Sometimes it works fine and other times only when it chooses.

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The switch operates a selenoid which in turn switches your vehicle into or out of 4x4. your selenoid might be sticking instead of the switch being the problem.. nothing beats the old stick which you grab and put it where you want it ...

Posted on Jan 26, 2009

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I have a 99 gmc sonoma truck 4 wheel drive and it will not come out of 2 wheel drive.


If it has the push button controls on the dash I have had those fail frequently. A lot of times you may push the button and the light may blink and then still stay in 2wd. That switch is also the control module for the 4wd. If it is the know select you need to check for power at the actuator on the transfer case.

Nov 08, 2014 | Cars & Trucks

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Question about auto 4wd on my 99 GMC Jimmy


no not normal. check center of firewall the is a switch with 3 vacuum line CHECK THEM ALL this is your 4wd selector. if thats okay you might need the switch on the front trasfer case about $20 just unscrews easy fix.

Dec 25, 2013 | 1999 GMC Jimmy

1 Answer

Service 4wd light appears on message box and the push buttons won't work. how can i find the problem in a cheap way? I don't really have money to blow on replacement parts. It's a 99'...


THis information from TS Bulletin...

Subject: "Service 4WD" Indicator Illuminated, DTC B2725 Set (Replace Transfer Case Shift Control Switch)
Models: 1999-2002 Chevrolet and GMC C/K Pickup and Utility Models (Silverado, Sierra, Avalanche, Suburban, Tahoe, Yukon, Yukon XL)
with Four Wheel Drive and NVG 236/246 Transfer Case (RPO NP8)

Condition: Some customers may comment on the Service 4WD indicator illuminating. Upon investigation, the technician may find DTC B2725 set.

Cause: The condition may be due to a intermittent fault in the transfer case shift control switch.

Correction:
Important: The transfer case shift control module should not need replacement. DO NOT replace P/N 15749703 unless diagnosis points to the module as the malfunction.

Replace the transfer case shift control switch using published Service Information procedures.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer. Thank you for using Fixya, and have a nice day.

Oct 19, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

I have a 1998 GMC K1500, the 2wd/4wd button has intermittent power issues. If you fiddle with pushing the buttons enough it will shift. The switch seems to be a circuit board. Would this switch be the...


Same issue and it is a pain in the *** to spend ten minutes trying to shift to 4wd and get it to go in or out. Did replace the actuator on the differential and it still does not work correctly.

Oct 26, 2010 | GMC K1500 Cars & Trucks

1 Answer

1999 gmc sonoma, auto, push button 4wd. jacked the rear wheels off the ground and pushed 4wd button, front drive shaft turns, but no power to front wheels, seems like everything is working like it should,...


Ive gone thru this THREE TIMES w/ my '99! Theres a thin, rubber vacuum hose that wears thin, gets dirt/oil/water in it & shorts a relay. The last mechanic replaced the hose w/ steel brakeline & Ive had no problems for 2 yrs.

Jan 18, 2010 | 1999 GMC Sonoma

1 Answer

Service 4wd light is coming on but 4wd works fine


i had the same problem in my 99,i replaced the switch assembly on the dash and all is well,hope this helps

Sep 01, 2009 | 1999 GMC Sierra

1 Answer

My 99 gmc jimmy has been locked in 4 high


try to disconnect your battery for about 5 minutes and then reconnect. it might help. I have the same problem with mine and it seems to help.

Jul 14, 2009 | 1999 GMC Jimmy

1 Answer

Won't shift into 4 wheel drive mode at all / 2000 GMC Jimmy SLT


I have had the same problem with my 2000 jimmy. Disconnect the battery for approx 1 minute and then reconnect, this should reset the computer. It has worked for me every time. I was told it was a glitch with GMC.

Dec 24, 2008 | 2000 GMC Jimmy

1 Answer

Transfer case in 99 GMC Suburban


Hello
I had this with a C3500 4x4 it was the wiring contection at the transmission please test all these problems as ths may be a cheap fix.

Hope this helps
www.limotec.co.uk
Regards Paul

Nov 29, 2008 | 1999 GMC Suburban

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