Question about 1998 Chevrolet K1500

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1988 chevy 4x4 actuator light stays on even in 2wd and neutral, plunger is extended and does not go back in acuator once you plug it in. Iput new actuator on ,plugged it in and 4wheel light came on and would'nt go off so i unscrewed the actuator and the plunger was fully extended, won't go back.

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  • Chevrolet Master
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Replace the control switch.

Posted on Nov 15, 2009

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1 Answer

Why does my 99 Chevy S10 keep jumping out of 2wd into 4wd? It don't want to go back into 2 wd with the yellow light lit?


A common issue with the push button style 4x4 is that the retaining clip in the transfer case comes off of the shaft and allows the actuator to slip in and out of position. I recommend pulling the solenoid out and inspecting it.

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4x4 neutral light stays on and 4x4 wont engage


Could be a problem in either the 4wd controller or the actuator on the transfer case. If you plan to keep the vehicle for awhile, purchase a used service GM manuals for your specific vehicle. The diagnostic flow charts are extremely helpful.

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When in park and put in 4x4, Relay in dash clicks 5 times and both 4wdH and Lo lights come on.


The actuator has a spring that is known to break easily in mid-late 90's chevy's.

Jun 17, 2012 | Cars & Trucks

1 Answer

Why won't my front differential engage? 1988 Chevy


Ok I know this question is old but for any one else who has this problem, I want to clear some info up. GM did not use vacuum on the 4x4 systems on the full size series. Only used on the S series (S10, S Blazers). Here is how to accurately trouble shoot these problems with the full size 4x4. Remove the front actuator from the front axle ( keep it plugged up and let it hang). Put the T-Case in 4x4 Hi or Lo doesn't matter. Turn key on (don't start the engine) . Now check the actuator to see if it has extended. If (no) now check the plug to see if you have current . If you have current to the plug, change the actuator. Problem solved. If no current to the plug. Check for broken wires ( fix if any) If no broken wires. There is another switch on the T-Case that sends power to the actuator Replace it.. Back to the actuator.... If everything checked out and actuator works. With the T-Case locked in 4x4, try to turn the front drive shaft by hand. With the T-Case locked in 4x4 you shouldn't be able to turn the drive shaft. If drive shaft doesnt turn the T-Case is in good shape and the problem will be in the front differential. In these cases the most common problem is an exploded thrust washer. At this point the front differential needs to be rebuilt. Back to the T-Case..... With the T-Case locked in 4x4, if the drive shaft spins, the problem will be in the T-Case and at this point the T-Case will need rebuilt......... I hope you get the information you need to troubleshoot the GM 4x4 issues.

Feb 21, 2012 | 1988 Chevrolet K1500

1 Answer

How can you check to see if a actuated on a 89 4x4 chevy k2500 is bad or not working


unplug thae actuator,unscrew it from the axle,plug it back in and engage the 4x4 ,plunger should extend,if it does the trouble is in the housing(washer out of place)

Jan 11, 2011 | 1988 Chevrolet K2500

2 Answers

1997 chevy blazer. when I push the 4wd button, it flashes and goes out. wont go to 4wd.


Check the fuse to the 4x4, if the fuse is good then check the 4x4 electric motor actuator on the transfer case. You should hear it work from 2wd, 4hi to 4low and back to 2wd with the push of the switch. if you don't hear it working then check the wire harness at the actuator motor, look for any damages like corrosion or cracked wire connector clips. If all electrical is in good working order, replace the actuator motor. If the 4x4 actuator is working on the transfer case, then the front hub 4x4 actuator may have gone bad and that's located on the front differential. It's common for the clip there to corrode and break and is an easy fix with a new collar pin, at worst it's the diaphragm on the vacuum actuator that is located under the battery tray. There is a vacuum switch on the top of the transfer case, driver side but when that fails, your front hub stay's locked in the on position. Good luck and keep me posted and hope it's a simple fuse that has gone bad. You can pick up all these parts at Auto Zone or Parts Source and they will have the step by step instructions for you to get the job done with common tools.

Dec 15, 2009 | 1997 Chevrolet Blazer

1 Answer

1996 sonoma when i shift into 4hi or low light comes on but front wheels wont engage. But the transmission does. any help to solve this problem


Check the fuse to the 4x4, if the fuse is good then check the 4x4 electric motor actuator on the transfer case. You should hear it work from 2wd, 4hi to 4low and back to 2wd with the push of the switch. if you don't hear it working then check the wire harness at the actuator motor, look for any damages like corrosion or cracked wire connector clips. If the 4x4 actuator is working on the transfer case, then the front hub 4x4 actuator may have gone bad and that's located on the front differential. It's common for the clip there to corrode and break and is an easy fix with a new collar pin, at worst it's the diaphragm on the vacuum actuator that is located under the battery tray. There is a vacuum switch on the top of the transfer case, driver side but when that fails, your front hub stay's locked in the on position. Good luck and keep me posted and hope it's a simple fuse that has gone bad. You can pick up all these parts at Auto Zone or Parts Source and they will have the step by step instructions for you to get the job done with common tools.

Dec 10, 2009 | 2000 GMC Sonoma Extended Cab

1 Answer

1988 chevy 4x4 actuator


The switch for the 4wd light is on top of the transfer case. It is probably sticking

Apr 06, 2009 | 1998 Chevrolet K1500

1 Answer

1999 CHEVY Z71 4X4 STUCK IN 4X4


i had the same problem and it ended up being short in the front axles where the actuator at or the switch on the transfer case under body where the shift lever at

Oct 22, 2008 | 1999 Chevrolet Silverado 1500

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