Question about Chevrolet Silverado 2500HD

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Service 4WD light on 2003 2500 HD

Already replaced my Electronic button/switches on the dash and the actuator above the skid plate that i believe goes into the transfer case and my light is still on and 4wd not working.. are there any relays or fuses that could cause this or where else should i look into fixing this problem.. Im confused and snows coming and i need this working ti plow.. Thanks all

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  • Chevrolet Master
  • 794 Answers

Hook up an OBD-II reader to your truck and pull the fault readings.

Once you get the fault readings, you should be able to locate the source of the problem.

In the meantime, you can subscribe to online service manual sites at Chiltondiy.com, autozone, alldatadiy.com, RepairSolutions(Innova) where you can get and download your vehicle specs and input fault codes.

If this is a serious priority, go to a reputable ASE certified transmission shop- at the very least, pay them to diagnose the problem and if its something you can repair yourself, at least you monetary losses are negligible.

You already wasted time and money trying to repair the problem in guesswork.

BTW, talking off the top of my head, it could be a bad transfer case control module or a wiring fault.









Posted on Nov 26, 2013

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Posted on Jan 02, 2017

shaggyrat
  • 1224 Answers

SOURCE: 99 silverado 4wd went out... transfer case?

a little tip a friend gave me in unlocking the 4wd drive on ramps or hill and then put in neutral let roll back a foot put in park and then let off the 4wd
when in 4wd the hubs get a little heated cause they need greased so they stick into position making it hard to come out of 4wd this which i spoke of i got stuck in the senerio where i almost drove home in 4wd from 300 miles away but i called my friend he told me bought this and so i thought it could help you

your hubs just locked up on you your bearings are going to need to be packed again this is normal for this

hub

Posted on Dec 06, 2008

  • 2 Answers

SOURCE: 4wd not engaging

These trucks are famous for the transfer case control module failing
and causing problems like you are experiencing. The module is
usually located in the passenger foot well kick panel. You should
be able to find it easy since that is what is making the clicking noise
when you try to go into 4x4. When you find it-unplug the 2 connectors
and looks for green corrosion on the terminals in the plug and also on
the module. They are famous for water intrusion thru the heater system. If you find corrosion, terminals in the connectors will need to
be replaced as well as a new module(they are expensive).

Posted on Dec 14, 2008

  • 33 Answers

SOURCE: I have a 2003 chevy blazer LS, 2-door 4wd w/

try putting in nuetral and then shift into high gear . if still does not work sounds like the 4x4 acctuator is bad

Posted on Jul 01, 2009

robslac24
  • 2 Answers

SOURCE: 01 Chevy Silverado 4 X 4 not working. 4WD light

Having the same exact problem but with my 1999 escalade. Thought it was the actuator bought a new one installed it transfer case would engage but front end wouldnt lock. Took it out of housing left it plugged in got a friend to go through all the 4wd for me and the plunger never moved out the actuator. Checked my wiring harness which is a four prong ann it had one hot prong like it is suppose to. Traced wires even replaced dash switch same problem. Taking it to local dealership tom to have it checked for codes. I was told it could be the transfercase actuator even though its workin that actuator is what sends power to the front to engage the actuator to lock the differential.

Posted on Sep 16, 2009

  • 2 Answers

SOURCE: it's a holden rodeo turbo/diesel 2005.check 4wd light on

A mere 2,400km into the life of my 07 Rodeo TD 4WD, I used 4L for about 2km of medium-steep/slippery track. After stopping and selecting 2WD the 'Check 4WD' light appeared, meaning I was stuck in 2WD for the rest of that trip. Luckily I was able to complete the trip in 2WD without incident.

The dealer blamed me for 'not following the instructions in the manual' (utter codswallop), 'fixed' it, and very reluctantly gave me a scribbled set of instructions on resetting the system, which I've included below.

When I suggested that these instructions should be included in the manual, the response was 'not necessary if owners use the system correctly'. More cods.

Here's how to reset it:

1. Ignition off, hold all 3 buttons (2H, 4H & 4L) in together

2. Switch ignition on to 'reds' position (last position before start)

3. Hold in this state for 30 seconds

Hope this may be of use !!

Posted on Jan 06, 2010

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Why can't I reset my check 4wd light on dash or move out of 2wd at all after replacing transfer case? Also motor cuts out and electronic throttle now won't open when won't start


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    Is your 4WD warning light on or a "Service 4WD System" message displayed? ...attempting to shift from 2WD high to 4WD low while the vehicle is moving), all the mode ... Resetting the TCCM may only be a temporary repair. ... The Bulb Check ...The mode switch on the dash will send a signal to the transfer case control ...

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    How To Override Stuck 4WD On A GMC Vehicle, Transfer CaseControl ... My 07 GMC Yukon is stuck in 4 wheel drive low, can I do this same process on it? .... has been changed, the module was reset, and the actuator were all replaced. ... is being slughish when i start off from red light or stop sign but after ...

Jan 18, 2016 | Cars & Trucks

1 Answer

I bought a new 4wd actuator for my 1990 k1500 and still didn't fix my 4wd to work


I am assuming that you are talking about electronic shift with controls on the dash? If so, there is an electronic controller in the dash that controls the actuator. Not cheap at a dealer. It has been a while since I had a problem with the truck that I no longer own.

Jan 05, 2015 | Cars & Trucks

2 Answers

2004 envoy 4 wd quit working


I had TONS of issues with my 2001 Jimmy 4wd. A few things to check; the 4wd actuator switch, the vacuum switch, hub assembly, and the electronic 4wd dash switch.

Apr 19, 2014 | 2004 GMC Envoy

1 Answer

4wd service light in dash just came on. cannot put into 4wd.


There are actuators on the front axle and the transfer case, check them both.

Feb 10, 2014 | 2000 Chevrolet Silverado 1500

1 Answer

My 4WD will not Disengage


i would check the cervo motor on the transfer case and listen for it to shift it out that might be bad or else it might be the electronic 4wd computer under the dash on the drivers side that might be bad or the solenoid on the transfer case might be shot. your best bet is to get a continuity tester and start at the actuator on the front end and see where the power is not coming through. to unlock it from 4wd unhook the actuator on the front diff. and see if it unlocks by pushing the button

Jan 30, 2013 | Chevrolet Cars & Trucks

1 Answer

4wd front hub wont disengage


Possible the vacuum bleed-off to the switch you installed isn't allowing it to completely disengage. Pull the bleed-off line from the new switch and see if it works. could be just a tight spot/bent closed in the bleed-off line or the vent plugged.

Apr 04, 2017 | 2002 GMC Sonoma Extended Cab

1 Answer

4wd wont switch out of 4 hi if it does goes to


Most likely the actuator motor on the transfer case or the switches in the dash,very rarely have I replaced the module under the dash!!
The switches cost around $65.00 and the actuator runs around $400.00 at the dealer for parts,Nether are a hard or complected job!
Hope this helps,Have a Nice Day!

PS From my experience it's probly the actuator motor.

Mar 10, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

The lights for the 4x4 on the dash dont come on and the four wheel drive doesnt engage


Slow or no Engagement of Front Axle when 4WD is selected (Replace Front Axle Actuator) Inspect the Electrical connector from the indicator switch located on the upper right side of the differential.

Replacing the actuator itself is a pretty simple job.
Remove the connector.
Unscrew the actuator.
Put some goo(thread sealer) on the threads of the new actuator if it doesn't already have it.
Screw in the actuator.
Plug in connector.

Replacing the transfer case switch will take more time.

Good luck and keep me posted. Glad to help you get your Tahoe running 100% again soon and thank you for using Fixya.

Mar 04, 2010 | 1999 Chevrolet Tahoe

2 Answers

I have a 2002 Chevy Silverado 8 cylinder 4wd extended cab. It has the push button shifter for 4wd. When I try to use 4WD Auto or 4WD Hi, the indicator lights come on but the 4wd does not engage. I read...


Fuse is located at the end of eh dash on drivers side and the Actuator is located at the front differential and on the passenger side.
When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts. The actuator may not be fully engaged or disengaged and the fork to the spline may be what is causing the grinding.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 88-99 CHEVROLET FULL SIZE
PURPOSE: IMPROVE AXLE CONNECT ENGAGEMENT TIME AND
COMPONENT RELIABILITY.

SYMPTOMS: NO FRONT DRIVE AXLE ENGAGEMENT WHEN SHIFTED INTO 4X4.

Obtain the following GM part numbers:
(1) 26060073 Actuator
(1) 88959465 Harness/Spacer Kit

Feb 03, 2010 | 2002 Chevrolet Silverado

2 Answers

Front end will not lock in in 4x4 transfer case is in & dash lite shows 4x4 but front wheels don;t lock in


Ok, this is probably going to sound greek if you have no automotive experiance, so here goes:

There are 2 possibilities I can think of at the moment depending on your 4wd system, however there are several things that can cause this

If you have a Push button 4wd (you push a button or turn a knob) the system engages using actuators or sylinoids meening you turn the 4wd on, the switch sends power to the selector option (high and low) and the 4wd light on the dash. the selector determines where the actuator/silenoid engages (either high or low) in the transfer case. However the actuator or silenoid can be faulty and yet the system will say 4wd is on because the switches still sending power to the 4x4 light

The next setup is the manual linkage set up, and given the year of your kia I doubt you have this setup However I am going to go through it anyway.

With a maual linkage setup you engage the trasfer case maualy using the 4wd shifter. Ironically on newer manual shift 4wd systems the dash light is still triggered electrically by location of the shifter not what is going on in the transfer case (Ah a flaw in the design) So if you linkage is loose/bent/damaged or somehow disconnected your 4wd wont engage but the light will still show that it is! Hope this helps

Jan 30, 2010 | 1999 Kia Sportage

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