Question about 1985 Chevrolet S-10 Blazer

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I have a 99 2500 that when i push the buttons on the dash you can hear the transfer case shifting put it doesn't go into 4wd? any ideas?

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Look at switch in front drive ax

Posted on Mar 22, 2009

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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

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4x4 low light on car will not move


The electronic module (located behind the glove compartment) controls the operation of the transfer case in response to inputs from the electric shift motor, 4x4 mode switch, CPP switch, BPP switch, DTR sensor, throttle position output from the PCM, front and rear OSS sensors, and the VSS. Do you know what DTC'S Are ? Diagnostic trouble codes !

P1804 4WD High Indicator Circuit Failure GEM GO to Pinpoint Test C . P1806 4WD High Indicator Short to Battery GEM GO to Pinpoint Test C . P1808 4WD Low Indicator Circuit Failure GEM GO to Pinpoint Test C . P1810 4WD Low Indicator Short Circuit to Battery GEM GO to Pinpoint Test C . P1812 4WD Mode Select Circuit Failure GEM GO to Symptom Chart. P1815 4WD Mode Select Short Circuit to Ground GEM GO to Symptom Chart. P1820 Transfer Case CW Shift Relay Coil Circuit Open or Short to Ground GEM GO to Pinpoint Test B . P1822 Transfer Case CW Shift Relay Coil Short to Battery GEM GO to Pinpoint Test B . P1824 4WD Electric Clutch Relay Circuit Failure GEM GO to Pinpoint Test A . P1826 4WD Electric Clutch Relay Short to Battery GEM GO to Pinpoint Test A . P1828 Transfer Case CCW Shift Relay Circuit Failure GEM GO to Pinpoint Test B . P1830 Transfer Case CCW Shift Relay Coil Short to Battery GEM GO to Pinpoint Test B . P1836 Transfer Case Front Shaft Speed Sensor Circuit Failure GEM GO to Symptom Chart. P1837 Transfer Case Rear Shaft Speed Sensor Circuit Failure GEM GO to Symptom Chart. P1838 Transfer Case Shift Motor Circuit Failure GEM GO to Pinpoint Test B . P1846 Transfer Case CONTACT PLATE "A" Circuit Failure GEM GO to Pinpoint Test B . P1850 Transfer Case CONTACT PLATE "B" Circuit Failure GEM GO to Pinpoint Test B .

P1854 Transfer Case CONTACT PLATE "C" Circuit Failure (GEM Only) GEM GO to Pinpoint Test B . P1858 Transfer Case CONTACT PLATE "D" Circuit Failure (GEM Only) GEM GO to Pinpoint Test B . P1866 Transfer Case Maintenance Required (GEM Only) (4-wheel drive operation can be restored by clearing the DTC and cycling the ignition.) GEM GO to Pinpoint Test B . P1867 Transfer Case Contact Plate General Circuit Failure (GEM Only) GEM GO to Pinpoint Test B . P1874 Automatic Hall Effect Sensor Power Circuit Failure GEM GO to Symptom Chart. P1875 Automatic Hall Effect Sensor Power Circuit Short to Battery (GEM Only) GEM GO to Symptom Chart. P1891 Transfer Case Contact Plate Ground Return Open Circuit GEM GO to Pinpoint Test B Your best bet , take it to a qualified repair shop

Apr 04, 2017 | 2002 Ford Explorer

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

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How do i swich my 2005 silverado from push button 4wd to a manual shift do they make kits for this


Since the transfer case is shifted via an electric motor there is not provision for mechanical linkage and I show not type of kit to convert the later cases.

Jun 06, 2012 | 2005 Chevrolet Suburban

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95 chevy blaver is stuck in 4wd. When i push the 2wd button i hear a clicking sound. How can i get my truck back to 2wd


SOUND LIKE PROBLEM IS IN TRANSFER CASE SWITCH OR THE TRANSFER SHIFT CONTROL MODULE.IN THE MIDDLE OF THE DASH.IT CONTROLS SHIFT MOTOR FROM 2WD TO 4WD.ALSO CHECK SHIFT ROD AND CABLE FOR BINDING AND DAMAGE.

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1 Answer

1999 siverado 4wd problem..started having problems coming out of 4wd, pushed 2wd dash indicator said 2wd but not in any gear. put in park, got grinding gear sound shut off engine restarted 2wd active now....


sounds like it might be an encoder moter, but the best thing you can do is take it to a good transmission shop so they can hook up their reader and find out for sure

Feb 06, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

How does my 4x4 push button locker work in my 1989 chevy K1500?


That depends a lot on how your truck is equipped. GM uses several different 4 wheel systems including AWD, Part-Time 4WD, Full-Time 4WD, and ON-Demand AWD. Then there is another version used on some trucks that is a combination of 4WD and On Demand AWD. - it gets a little confusing but each system as slightly different charachteristics.

Genericly speaking, if you have the push-buttons on your dash that say "4-HI", "4-LO", and "2HI" and/or Auto-4WD , the transfer case has an electronicly-controlled stepper motor which shifts the transfer case into the selected mode. An electric solenoid/actuator then engages/disengages the front differential for 2-Wheel or 4-Wheel modes. One push of the button and it shifts the transfer case and engages the front differential.

That's much easier than the old days when you had to stop the truck, get out (Sometimes in the middle of a big mud hole) and lock the front hubs then get back in and play with the lever in the floor to get the transfer case to shift into the desired mode.

Oct 22, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

4wd doesnt work


First make sure someone did not replace the transfer case with a manual shift transfer case. If not you have what mechanics call "GHOSTS" there is a miscomunication somewhere between the button and the relay this will take time to trace down get a good multimeter and a wiring diagram.

Apr 28, 2009 | 1998 Chevrolet K1500

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