Question about 1999 Chevrolet K1500

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2003 silverado 4x4 pickup,4wd not working ,service 4wd light on. select switches do not light up or appear to be working.

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Several things could cause this since it is auto 4wd and controlled by a COMPUTER! Start the simplest, cheapest troubleshooting first; the electrical and computer system contact plugs and points.
1. it could be cracked solder connections inside the push button switch - try to re-solder or replace the switch.
2. possibly the encoder motor is bad. It is on the side of the Tcase and turns a shaft to shift the case. - try getting one from a scrapyard and swap it, much cheaper than new.
3. The computer module failed, or the contact from the plug to the plug pins is corroded. - first try to unplug and plug back in a few times to make a good contact. if that fails to work, get a used one from the scrapyard and swap it ($50 compared to a new one $500!) Get some cleaning\lube spray from Radio shack for computer terminals to keep from corroding.
4. It could be that you just have a bad connection in the 4wd wiring system. That was my case, it was just the plug connection at the computer module and has been working ever since, and now I have a spare computer module sitting on the workbench.

The computer module is the biggest pain to get to. It is buried in the dash behind the headlight and push button 4wd switch. Good luck!

Posted on Jul 05, 2010

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On my 04 silerado 2500 hd I heard a clunk when I was engaging 4x4,now it won`t even go into 4x4 and might be a totally different problem

Posted on Jan 30, 2014

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1 Answer

The service 4x4 light comes on when I engage 4x4 on a 2003 Dodge Ram 3500 Dually 5.9 T D 4 DOOR


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2003 Montero Limited, will not go into 2w high . What is the most Common fault?


Yes larry is very correct.Try going in reverse.

On these issue,there are few solved help links for troubleshooting the issue easily.-------

Click the link below:---
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http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html

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http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html

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4WD light is flashing and beeping? NO 4WD high?

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http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html

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http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html

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http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html

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http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html

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http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html

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These details will help.

Thanks.

Nov 26, 2012 | Cars & Trucks

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 2004 GMC Envoy XL and the high range 4x4 mode will not engage. The AWD system works just fine as well as the 4x4 mode in low gear. What is causing this?


Is the Service 4WD light coming on? Do the light on the 4x4 selector switch indicate the proper selection and are on steady after a few seconds? If there is no Service 4WD light on and the selector switch light are correct, the only place for the problem to be is the Transfer Case. Has the Transfer Case fluid been changed at 50K mile intervals? This is very important.

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1 Answer

2003 chevy 1500 hd 4x4 dash says [ service 4wd] i did not no i had a problem . what could it be?


The light usually is a factory schedule maintainence (transfer case fluid) $75 at firestone

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1 Answer

Chevrolet silverado 2003 5.7l transfer not


Very common. I have the same truck. I replaced the 2-4WD switch on the dash but the problem also was the actuator under the front end. very simple on replacing both parts.

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1 Answer

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