Question about 1998 GMC Jimmy

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1998 jimmy 4 wheel drive problem

How do i replace the module under the kick plate for the 4wd. I tried a new dash switch but didn't help and I am stuck in 4 lo. it won't let me out of it. I hear the noise under the kick plate and it is a clicking noise but doesn't shift to 4 hi or 2 hi. I have to put it in neutral just to get it to make the noise.

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  • bobcat1983 Nov 25, 2008

    i bet your right! Before i got it stuck in 4 lo I did hear a strange noise coming from the right front tire area like a loud hum. I stopped the car and turned it off then the noise stopped. That happened when I was driving in 2 hi on the expressway. It happened a couple of times. Probably the transfer case motor?

    Maybe I should just replace the motor.

  • bobcat1983 Nov 25, 2008

    IT WAS SO simple! The ATC fuse needed replacing! Go figure!

  • fsaxer Dec 10, 2008

    2005 2500hd won't shift in 4 x 4 when moving just grinds

  • Anonymous Mar 19, 2014

    has 1 switch on dash for hi & lo 4wd

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  • 260 Answers

Are any of the lites on the switch flashing? you may have a sticking 4x4 shift motor on the transfer case. with a helper, key on someone under vehicle at shift motor, one operating the 2wd button, give shift motor a rap with small hammer on metal portion of shift motor to see if you hear it trying to work. to access control module, remove plastic right kick panel and its right there. remove connector and inspect for corrosion or bad connection. also try park and neutral, may even have to be rolling a bit to disengage. let me know how you make out and will help further if i can. do you know what transfer case system you have? np1 or np4?

Posted on Nov 23, 2008

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Posted on Jan 02, 2017

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SOURCE: my jimmy's 4wd acctuator seems

two common things with the push button 4x4 the button panel itself or the encoder motor loose its marks usually the buttons will all flash if the panels bad and it wont go into four wheel high if the encoder motor goes bad but if these dont sound like your symptoms you might have a bad transfer case module hope this helps good luck

Posted on Aug 22, 2010

k714
  • 67 Answers

SOURCE: 2000 jimmy 4wd Hi, auto 4wd and 4wd Lo indicator

mine has done that since i bought it. i was told by 3 top rated techs this was a normal process when it was shifting from one to the other.

Posted on Oct 13, 2009

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1 Answer

My 98 chevy k1500 has the electonic push button 4 wheel drive that does not work i have replaced it but still get nothing shows power but does not enguage


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Ford 2005 4x4 problem.


2-Speed Torque-On-Demand (TOD) Operation
The automatic 4-wheel drive (A4WD) system is a 2-speed torque-on-demand (TOD) operation that utilizes the following components:
  • Transfer case
  • 4-wheel drive (4WD) control module (integral to the powertrain control module [PCM])
  • Mode select switch (MSS)
  • Gearmotor encoder assembly (part of the transfer case shift motor)
  • Transfer case shift motor
  • Shift motor sense plate (part of the gearmotor encoder assembly)
Principles of Operation
Transfer Case Shift Motor The externally mounted transfer case shift motor, located at the rear of the transfer case, turns the shift cam assembly. As the shift cam assembly turns, it positions the reduction shift fork for desired transfer case operation. An integral position sensor in the shift motor provides shift motor position information to the 4WD control module.
Mode Select Switch (MSS) The push button MSS, mounted on the instrument panel, allows the operator to select the 4x4 Auto, 4x4 High, and 4x4 Low transfer case operating modes. The indicator light, on the instrument cluster push button, will illuminate only when the 4x4 Low position is engaged.
Visual Inspection Chart Mechanical Electrical
  • Axle shafts and CV joints
  • Driveshaft and universal joints
  • Fluid leaks
  • Matching tire sizes
  • Transfer case shift motor
  • Battery junction box (BJB) fuses:
    • 8 (30A)
    • 17 (5A)
    • 18 (20A)
  • Central junction box (CJB) fuses:
    • 12 (5A)
    • 24 (15A)
  • 4x4 module (PCM)
  • Wiring harness
  • Gearmotor encoder contact plate
  • Connector(s)
  • Circuitry
  • Mode indication switch (MSS)

  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the concern is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  1. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
  1. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
    • CAN circuit fault; all electronic control units no response/not equipped, refer to Section 418-00 .
    • No response/not equipped for 4WD module (PCM), Go To Pinpoint Test G .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the 4WD module (PCM) self test.
  1. If the DTCs retrieved are related to the concern, go to the 4WD Control Module (PCM) Diagnostic Trouble Code (DTC) Index to continue diagnostics. 4WD Control Module (PCM) Diagnostic Trouble Code (DTC) Index
    DTC Description Source Action B1317 Battery Voltage HIGH 4WD Module (PCM) REFER to Section 414-00 . B1318 Battery Voltage LOW 4WD Module (PCM) REFER to Section 414-00 . B1319 Driver Door Ajar Circuit Failure 4WD Module (PCM) Go To Pinpoint Test M . B1322 Driver Door Ajar Circuit Short To Ground 4WD Module (PCM) Go To Pinpoint Test M . B1342 ECU is Defective 4WD Module (PCM) CLEAR the DTCs. REPEAT the 4x4 module (PCM) self test. If DTC B1342 is retrieved, INSTALL a new 4x4 module (PCM). REFER to Section 303-14 . CLEAR the DTCs. REPEAT the self test. B1483 Brake Pedal Input Circuit Failure 4WD Module (PCM) Go To Pinpoint Test M . B1485 Brake Pedal Input Short to Battery 4WD Module (PCM) Go To Pinpoint Test M . C1729 Transfer Case Unable to Transition Between 4H and 4L 4WD Module (PCM) Go To Pinpoint Test K . C1970 4WD Low Mode Switch LED Short to Battery 4WD Module (PCM) Go To Pinpoint Test K . C1971 4WD Low Mode Switch LED Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1707 Transfer Case NEUTRAL or PARK/NEUTRAL Indication Circuit 4WD Module (PCM) Go To Pinpoint Test M . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1816 Transmission NEUTRAL Safety Switch Circuit Failure 4WD Module (PCM) Go To Pinpoint Test M . P1819 Transmission NEUTRAL Safety Switch Circuit Short to Ground 4WD Module (PCM) Go To Pinpoint Test M . P1820 Transfer Case Clockwise Shift Relay Coil Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1822 Transfer Case Clockwise Shift Relay Coil Circuit Short To Battery 4WD Module (PCM) Go To Pinpoint Test K . P1824 4-Wheel Drive Clutch Relay Circuit Failure 4WD Module (PCM) Go To Pinpoint Test H . P1826 4-Wheel Drive Low Clutch Relay Short Circuit to Battery 4WD Module (PCM) Go To Pinpoint Test H . P1827 4-Wheel Drive Low Clutch Relay Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test H . P1828 Transfer Case Counterclockwise Shift Relay Coil Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1830 Transfer Case Counterclockwise Shift Relay Coil Circuit Short To Battery 4WD Module (PCM) Go To Pinpoint Test K . P1849 Transfer Case Contact Plate A Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1853 Transfer Case Contact Plate B Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1857 Transfer Case Contact Plate C Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1861 Transfer Case Contact Plate D Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1867 Transfer Case Contact Plate General Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1891 Transfer Case Contact Plate Ground Return Open Circuit 4WD Module (PCM) Go To Pinpoint Test K . U1900 CAN Communication BUS Fault 4WD Module (PCM) REFER to Section 418-00 . U2023 External Node Fault 4WD Module (PCM) REFER to Section 418-00 . U2051 One Or More Calibration Files Missing/Corrupt 4WD Module (PCM) Reprogram/Reflash the 4x4 module. REFER to Section 418-00 . - For All Other DTCs 4WD Module (PCM) REFER to Section 418-00 .
  2. Your best bet mite be to take it to a qualified repair shop !

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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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