Question about 1999 GMC Jimmy

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2002 Jimmy, replaced both the 4WD shift actuator. It just bolted into place, no problem. After that,it was discovered the Control module was bad! Corrosion and burned circuit board, I have since found a replacement module, and now, It will shift properly. The dash switch lights up, and the shift actuator makes a bad noise, and I noticed it will not shift OUT of 4WD mode. So I pulled the fuse again, disconnected the module, and the truck resorts back to 2WD (even though the 4WD switch does not light up anymore AND the "service 4WD light" come on)..do I have abad motor here?

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Posted on Jan 02, 2017

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autodr
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SOURCE: 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.

Posted on Nov 16, 2008

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  • 1 Answer

SOURCE: 4WD shift problems

Some one told me to unhook the batery for half an hour then hook it back up and try it. Well it worked,no more shif problems.

Posted on Nov 29, 2008

  • 39 Answers

SOURCE: 1995 gmc jimmy 4wd high not working

sounds like it is loosing vacuum check all the lines for a crack even the engine lines will cause it to loose vacc. pressure. if it is not run to the vacuum reserve canister you may not have enough vacc. to hold the actuator in several times I just run new lines and that helped and not very costly.

Posted on Dec 25, 2008

  • 1 Answer

SOURCE: My 01 Trooper had problems

We have a 1998 Trooper that had the same problem. The fix was an electronic switch for the 4WD - a vacuum sensor - on the front axle that just plugs in. You can see it - if you look under the car from the front, it's mounted in the middle of the front axle. It cost $175 from the dealer. We had somebody install it for $50. Don't know where you live, but they are exposed and can corrode. That's what happened to ours. Good luck - hope it's the same problem. This was an easy fix, and we were pleased.

Posted on Jan 16, 2009

  • 1 Answer

SOURCE: service 4wd light

what causes the 4wd to kick in when you have it in 2wd

Posted on Apr 05, 2009

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2002 ford ranger - Where is the 4x4 actuator located


On the transfer case
Transfer Case - Electronic Shift
The four-wheel drive electronic shift-on-the-fly feature electrically shifts the vehicle transfer case between 2WD, 4WD HIGH, and 4WD LOW. The system mode is selected by the operator through the mode select switch (MSS) on the instrument panel. The operator is informed which mode the system is in by two instrument cluster indicators: one for 4WD HIGH which appears as 4WD, and one for 4WD LOW, which appears as 4WD LOW. Shifts into 4WD HIGH can be made at any speed. When shifting into 4WD HIGH with the vehicle stationary, tooth blockage may occur preventing shift completion. When the vehicle is driven above 8 km/h (5 mph) the shift will complete. When shifting in or out of 4WD LOW, the four-wheel drive (4WD) control module requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal be applied, and the transmission be in NEUTRAL (automatic transmission) or the clutch pedal be depressed (manual transmission).
The gearmotor encoder assembly is mounted externally on the transfer case. It drives a rotary cam which moves the mode fork and range fork within the transfer case between the 4WD HIGH, 4WD LOW, and 2WD range positions.
The four-wheel drive (4WD) control module controls the gearmotor encoder assembly that shifts between 4WD HIGH, 4WD LOW, and 2WD modes.

Mar 17, 2017 | Ford Cars & Trucks

1 Answer

Four buttons on dash for 4 wd. won't stay on 2 wd and it goes back to 4wd by itself


Sorry, but three possibilities. Most likely the 4wd actuator motor on the transfer case went bad. This is pretty common. They also encounter switch problems, but it sounds like your switch is doing what it's supposed to. One more thing, there is a 4wd control module, usually in the right kick panel. I'm betting on the shift motor though.

Sep 03, 2011 | 2000 GMC Jimmy

2 Answers

'Hokay, so now my lovable '99 Jimmy which was having breathing troubles, is now having 4WD trouble. And I think it's just the switch on the dash board; when the truck starts up, the light in 2HI doesn't...


The transfer case is computer controlled. The only way to give you a definative answer for your question is to scan your Powertrain Control Module for fault codes and perform a system check while monitoring transfer case input/output data to see if the computer is recieving the signal from the selector switch. On most GM vehicles, if there is a malfunction with ANY PART

Jan 09, 2011 | 1999 GMC Jimmy

1 Answer

Where is shift actuator located on 1999 Jimmy 1999


I had the same problem with my 1999 Silverado which would blink several times on the mode I selected then go back to the 2 wheel High. I found the switch module to be defective, after replacing it I have never had the problem again.

Nov 22, 2010 | 1999 GMC Jimmy

1 Answer

97 blazer wont engage 4 wheel drive dash lights switch but no hi or low checked two fuses on panel inside door


3 button or 4 button. If 3 button remove the pass side kick panal and diconnect the module you see there with the key on. 3 or 4 button the trucks are known for water leaks and they fill the module(3 or 4 button module are in the same place) causing all kinds of problems. What has happened to my jimmy same year was the front diff actuator ( under the battery tray) was full of transmission oil. I worked at a gm dealer as a trans tech. The front diff actuator had blown a hole in it. I have to replaced the 4wd vac switch on top of the transfer case that was where I got the oil from, also the actuator and the vacume ball behind the abs motor pack as it to was full of oil. if lucky you will not have to change your hvac control head.

Dec 23, 2009 | 1999 GMC Jimmy

1 Answer

4wd will not engage, or engages intermittently. You can hear the click of a switch under or near the battery, but doesn't always engage.


Hi:
The main parts to the 4WD system are the transfer case, the shift control motor, and the shift control module. if you remove the shift control motor from the transfer case, and leave it plugged into the harness, you should be able to see if it functions thru all settings, such as 4wd high or low or 2wd. If not, then you need to figure out which part is bad, the motor or the control module. If it does work as it should, then you have some sort of transfer case problem.

Dec 10, 2009 | 1996 GMC Jimmy

1 Answer

I need to locate the 4 wheel drive control module on a 2002 Chevy Silverado. can you tell me where to look


  1. Remove the IP trim bezel.
  2. Pull out the lamp switch, 4WD shift buttons, cargo lamp and air deflector louver assembly in order to disconnect the electrical connectors.
  3. Disconnect all the electrical connectors from the lamp switch, cargo lamp and 4WD shift buttons assembly.
  4. Remove the lamp switch, 4WD shift buttons, cargo lamp and air deflector louver assembly from the vehicle
  5. Remove the electrical harness retainer from the IP support beam.
  6. Disconnect the 2 electrical connectors from the transfer case shift control module.
  7. Move the electrical harness to the left side in order to make room to turn the transfer case shift control module.
  8. Rotate the transfer case shift control module about 45 degrees counter clockwise while pulling out at the same time until the module is approximately 90 degrees from the original position.
  9. Pull out the module from the vehicle

Jan 02, 2009 | 2002 Chevrolet Silverado

2 Answers

1995 gmc jimmy will not shift out of 4wd high


sounds like the vacuum lines are either pinched or the vacuum pump is shot. try getting a mechanic look at the lines on and around your transfer case... also try checking the fuses for the 4wd selector. let me know how it goes

Dec 26, 2008 | 1999 GMC Jimmy

2 Answers

1995 gmc jimmy 4wd high not working


sounds like it is loosing vacuum check all the lines for a crack even the engine lines will cause it to loose vacc. pressure. if it is not run to the vacuum reserve canister you may not have enough vacc. to hold the actuator in several times I just run new lines and that helped and not very costly.

Dec 22, 2008 | 1999 GMC Jimmy

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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