Question about 1999 Chevrolet Silverado 1500

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1999 z71 4x4 stuck in 4 wheel drive

Do the z71's have a problem with the transfer case solinoid going bad?

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  • clawdaddy Oct 27, 2008

    Didn't help much

  • stevepiccini Oct 31, 2008

    I have a 1996 and the four wheel drive light blink and at times it dis engages and i have to turn it off and let it sit for 2 hours befour it will go back into two wheel drive

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Posted on Oct 25, 2008

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I just bought a 2003 superduty crew with a 6.0 diesel it will not go into 4 wheel drive. i have replaced the vacuume pump and the solinoid (they were bad) I have no power to the switch in the dash. i have...


What large square fuse ? The 4X4 switch get's it's B+ voltage from the four - wheel drive control module . computer controlled ! Has two relay's - transfercase hi to low & low to high ,located in the Auxiliary relay box #3 . location left side of radiator core support . Your best bet ,take it to a qualified repair shop that has a diagnostic tool that can communicate with the 4X4 control module . Read code's ! Probably has a code like one of these
P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure 4WD control module Go To Pinpoint Test D . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground 4WD control module Go To Pinpoint Test A .
But code have a few others as well .
B2105 Throttle Position Input Out of Range Low 4WD control module Go To Pinpoint Test B . B2106 Throttle Position Input Out of Range High 4WD control module Go To Pinpoint Test B . C1728 Transfer Case Unable to Transition Between 2H and 4H. 4WD control module Go To Pinpoint Test C . C1729 Transfer Case Unable to Transition Between 4WD HIGH and 4WD LOW 4WD control module Go To Pinpoint Test D . C1979 IWE Solenoid Circuit Failure 4WD control module Go To Pinpoint Test F . C1980 IWE Solenoid Short to Battery 4WD control module Go To Pinpoint Test F . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure 4WD control module Go To Pinpoint Test D . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground 4WD control module Go To Pinpoint Test A . P1824 Transmission 4-Wheel Drive Clutch Relay Circuit Failure 4WD control module Go To Pinpoint Test A . P1826 Transmission 4-Wheel Drive Low Clutch Relay Short Circuit to Battery 4WD control module Go To Pinpoint Test A . P1827 Transmission 4-Wheel Drive Low Clutch Relay Short Circuit to Ground 4WD control module Go To Pinpoint Test A . P1849 Transmission Transfer Case Contact Plate A Short Circuit to Ground 4WD control module Go To Pinpoint Test D . P1853 Transmission Transfer Case Contact Plate B Short Circuit to Ground 4WD control module Go To Pinpoint Test D . P1857 Transmission Transfer Case Contact Plate C Short Circuit to Ground 4WD control module Go To Pinpoint Test D . P1861 Transmission Transfer Case Contact Plate D Short Circuit to Ground 4WD control module Go To Pinpoint Test D . P1867 Transmission Transfer Case Contact Plate General Circuit Failure 4WD control module Go To Pinpoint Test D . P1891 Transmission Transfer Case Contact Plate Ground Return Open Circuit 4WD control module Go To Pinpoint Test D .

Nov 27, 2017 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

1500 stuck 4 wheel drive


Try having the truck where you can reverse for 75 to 100 feet shift truck into 2whieel then into reverse and back up 100 feet this should unlock the differential. if not get under truck there will be a a small switch mounted to the transfer case near shifter remove switch push rod in with a screw driver then re-install switch on transfer case.this will work.

Dec 06, 2013 | 1999 Chevrolet Suburban

1 Answer

I have a huge loud knocking noise when i engage the 4wd on my 1999 navigator. i replaced the solinoid on the transfer case but it didnt stop. i thought it was maybe engaging the tranfer case 1/2 way.


I had a 4x4 year ago. Do you have front locking hubs ? I don't think so if you did I would ask if they were in or out. If there is nothing else It has to be coming from the transfer case. As far as I know no manufacture makes a true 4 wheel drive but Jeep except for maybe Raptor or Power Wagon. Most come with an open diff in the rear one wheel drive unless you order it special and the front you can't even order a locker if you wanted to 99.+% of 4x4s have open diffs in the front. Jack up one front wheel and one rear wheel if you didn't order a special rear end if you try to drive off the jacks you will sit there and spin your 2 wheel drive and not move.Ford says if you have worn tires or not the same air pressure in all tires it will do this. I think you have a bad u joint or pieces broken in the transfer case or it is out of adjustment. Jack car up like I said before and when the wheels spin without pulling it off the jack stands crawl under and see where the noise is coming from front or transfer case.I wonder if your shift motor could be bad they are about 65 dollars

Dec 16, 2011 | 1999 Lincoln Navigator

1 Answer

4 wheel drive lites up on switch but wont engage


Could be the front axel solinoid, [ the most common problem ], there are other things that can go wrong with this system such as transfer case encoder motor and sensors. Sou should have the system scanned to locate the problem.

Jan 03, 2011 | 1999 GMC Envoy

1 Answer

1999 Chevy Suburban 1500 stuck in 4 wheel drive.


Check the wire harness on the transfer case to make sure it's still plugged in. Check the selector switch in the dash. Check the hub sensor wire harnesses on the front wheels.
Check for error codes through OBD-II connector under the dash.
Good luck.

Feb 14, 2010 | 1999 Chevrolet Suburban

2 Answers

1999 ford f250 super duty 4x4 will go into 4


transfer case selector switch or equivlent to is bad or connectors to the switch is bad dose it do only when it rain or moisture underneath.

Jan 19, 2010 | 1999 Ford F250 Regular Cab

2 Answers

Need vacuum diagram for 4-wheel drive


the 4x4 don't use vacuum. the front is auto lock when the transfer is engauged with the button. if the light don't which when pressed into 4hi or 4low. the motor on the transfer case maybe hung up. they have to be used at least 4 times a year not to go bad. the motor is on the back side of the transfer case. best of luck.

Aug 07, 2009 | 1999 Ford Ranger SuperCab

2 Answers

Transfer case wont engage


shift into 4wd and move truck a couple of feet.
if light is still off, park truck block the wheels set the park brake jack right front wheel and try to hand spin the wheel if wheel doesn't turn 4x4 is functioning properly but there is a wiring problem use an ohmmeter to check the 4x4 switch wiring fuse and bulb
if wheel turns freely the front axle or transfer case is not engaged
attempt to hand spin the front driveshft if the driveshaft will spin the transfer case is not engaged check the transfer case shift linkage, problem is in linkage or transfer case internals
if the driveshaft will not spin the transfer case is engaged properly
with trnsmission in neutral or park start engine measure vacuum on the two vac lines at front axle shift motor . one line should have approx 20" vacuum. other line should have none
if no vacuum measured look for vac leak or bad vac switch
if both lines have vac look for a bad vac swithc or ruptured cad actuator diaphragm
if one line has 20" +- VAC
move transfer case lever to 2wd measure vac again lines should have swapped vac signals
if no vac switch bad or 4wd shift likage needs adjusting
if yes vac motor bad or stuck or shift fork stuck
remove vac shift motor from the axle attach vac lines to shift motor engage disengage 4wd
does shift motor plunger move at least 1/2 inch
no shift motor bad
yes check axle shift fork and vac motor for binging

Jan 27, 2009 | 1999 Dodge Ram

3 Answers

Ford F150 front tires won't engage in 4 wheel drive


look on fire wall pass. side you will see 2 parts with vacume lines attached 99 percent of the time that is what went i had the same problem

Dec 15, 2008 | 1999 Ford F150 Regular Cab

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