Question about 1998 Chevrolet K1500

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1998 z71 push button 4wd will not work

It is stuck in 2wd i changed the transfer case 4wd module. the transfer case motor will work if you put volt's to it from the battery but the when you push the 4wd buttons hi or low the light's just flash but when i tested the voltage at the transfercase motor wiring harness it has 12.5 volt's

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Some of these must be reprogrammed.Double check the connections, look for bent pins, with a terminal tool or small pick CAREFULLY bend female connectors tighter to ensure good contact with male pins. The use of a good scanner could help pinpoint the trouble.

Posted on Feb 04, 2009

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Replace the vacuum switc on the left side of the transfer case, should have 2 vacuum lines to it

Posted on Feb 04, 2009

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1 Answer

My 1997 GMC Sierra lights for 4hi and 4lo blink when i push the 4hi button and then goes back into 2hi. but when i push 4lo it locks in and works fine. I tried changing the 4wd motor on the transfer c


THE TRANSFER CASE MOTOR IS ONLY FOR 4WD LOW. That would have never been the problem as soon as you confirmed it shifted into 4wd Low. 2wd and 4 Hi work off of vacuum. You may have one or two issues. A vacuum leak up by the front axle that engages the 4wd HI or the sensors on the transfer case.

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I have had my Transfer Case Encoder Motor in my 2005 1500 Z71 replaced 2 times inthe last month, the last one replaced was less than 5 days ago. The last 2 mornings when I have started the truck the 4wd...


I would say the transfer case is hanging up and destroying the motor., and no there are no recalls, maybe technical service letters but these are not recalls.

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My 98 f150 was in 4WD Hi this morning when I started it. Selector switch is in 2WD position. 4WD Hi light is on, hubs (or front differential) is engaged and transfer case engage. (Feel front wheel hop...


If the switch was in the 2WD position and the transfer case was locked in a 4WD range, my 2 SWAGs would be bad switch or the connector to the shift motor is damaged / corroded or the fuse to the transfer case shift relay module is blown ( fuse # 17 ) / problem with the transfer case shift relay module.

This is without knowing if the truck was used in 4WD the night prior, and shifted out just before turning off. If this is the case, the shift motor might be stuck, and a few hits with a dead blow hammer to the transfer case might jar it free again ( do not use a metal hammer, it could damage the transfer case ).

The vacuum shift solenoids on the firewall are controlled by the GEM ( Generic Electronic Module ) which is grounding either the 2WD or 4WD solenoid, depending on the shift plate contacts in the transfer case. ( when in 4 or 4H, the contact switch plate signals the GEM, which in turn grounds the correct solenoid ).

Pulling the switch will not cause the transfer case to go back to a default position, the switch has a resistance level for each mode, and needs that value to operate the shift motor.

The resistance values for the switch between the 2 dark blue wires:
2WD - 4100 to 3700 ohms
4H - 1050 to 1150 ohms
4L - 380 to 340 ohms
- find the wire locations on the switch, mark them and remove the connector to test the resistance.

Just my opinion on the order :

1. Check the fuses for the shift motor
2. Try the old school shift method, back up ~ 50' put into park or neutral, and shift from 4WD to 2WD.
2.1. This is to see if the transfer case shift motor is bound up, and reversing might release it
3. Try hammering the transfer case with a dead blow hammer while someone shifts from 2WD to 4WD. You only need the key in the run position, if it happens quick enough after running the engine, the vacuum reservoir will still have enough vac to operate the solenoids. Don't chance running yourself over.
3.1. If this frees up the shift motor and the vacuum has bled off, you can try starting the truck and shifting into 4H then back to 2WD to get the front axle to disconnect or manually vacuum operate the front disconnect motor by applying vacuum to the pink vacuum line on the shift motor on the front axle.

Mar 05, 2011 | 1998 Ford F150 Regular Cab

1 Answer

Electronic auto 4wd button pushed and now 4wd high won't stop blinking, goes into 2wd high ok but not 4wd high or low. Both just blink. Tried putting it in neutral as manual described, which worked. ...


When you push teh 4hi button, yo shouldhear a click under the right side dash. That is the transer case shift module. Also check for any blown fuses. You should also hear the encoder motor activate when you push the 4wd button. The encoder motor is attached to the side of the transfer case and you. These tend to go bad from corrosion. You can test the encoder motor by disconnecting it from the electrical supply and use a jumper to apply 12 volts to the plug in on the motor. I found an easy way to apply voltage whenever I need t test something. I use a 12 volt battery charger. Straighten out two metal paper clips and clamp one in each of the alligator clips on the battery charger. turn the charger on to the lowest amp setting and us the paper clips as probes to activate whatever part you are testing. Works great, and you don't have to remove the part to test it. If the encoder motor won't work with the tester, it will have t be replaced. They are not cheap. Avoid the dealerships. They'll charge up to $800 for one. Check NAPA or auto zone. If the encoder motor checks out ok, then move on to the vacuum lines, especially the one under the battery tray. You will have to remove the battery and ray to get to it, but it is notorious for coming loose. Read your owners manual for warnings about disconnecting the battery, concerning stereos and alarm systems.

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2 Answers

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

1998 chevy z71 1500


Crawl underneath and look for disconnected or damaged wire or vacuum line to transfer case or front axle.

May 01, 2009 | 1998 Chevrolet S-10 Pickup

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

1 Answer

Intermittent 4wd on 98 jimmy


the module is what i would suspect. and i do believe it is in the r kick panel. i've seen the button pack on dash go bad too, but module is best bet.

Nov 14, 2008 | 1998 GMC Jimmy

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