Question about 2003 GMC Sonoma Extended Cab

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4WD (w/ electronic transfer case), 5-speed manual tranny, has 79K+ miles, yesterday service engine light came on, today truck whined when starting, then cut off, would not restart. Fuel cap is new, same fuel as always, serpentine belt seems fine, what else could cause such quick problem (engine turns over, starts briefly, then conks out), no previous problem...help

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1999 Suburban 4WD, Noise from the transfer case?

Your problem is similiar to mine . the web-site has been helpful. $2000.00 sounds way to much for repair on that vehicle with such high mileage. I went to a dismantler and bought a used transfer case for under $350.00. Did the labor myself with a little help. It's not too difficult if you have a some diy experience or ability. As your working on it stay with the web-site for install hints or go to autozone.com for repair diagrams.
Good luck have a good day.

Posted on Jan 07, 2009

  • 2 Answers

SOURCE: My 96 Suburban will not start.

If you have a 1996 Suburban that will not start. The first place I would start is take the screws out from the cover under the ignition switch and replace the box with all the wires. That box when bad will cause all kinds of things to happen...Truck not to start. Shifts darn hard from 1st to 2nd gear. Wipers to not work at time or the wipers stop and go. You will not get the impulses to even register on a tester. After hooking up to a computer I could not get anything to register on the tester/computer as I was turning over the motor with the ignition switch...Next I decided to turn over the motor with the ignition switch and wacked the bottom of the stiring column and the puter screen cam to life....Replaced the box and never had a problum in 4 years and my truck transmision dont slam gears any more.
Hope this helps.
Sincerly
Troy H
troylynxtn@yahoo.com

Posted on May 15, 2009

Molson02536
  • 3854 Answers

SOURCE: GMC Sierra "Service 4WD" message

You should be fine to drive it home, as long as you don't drive it like that all year. There are a few things that activate the 4WD and one of the components has a failure and needs to be addressed. Good luck and hope this helps.

Posted on Jun 15, 2009

morse008
  • 1111 Answers

SOURCE: 1995 GMC Sierra 5.7 liter stalls and is hard

even though parts are new they also come with defects so it sounds as if when you turn the key you hear it working and other times not at all hmmm connections are tight ? could be faulty fuel pump or relay .

Posted on Aug 24, 2009

  • 1 Answer

SOURCE: 2004 GMC Sierra 1500 4wd. Auto transfer case light issue

I have the same problem. It is intermittent and sometimes shows up with service transmission message. To get rid of it just put the truck in park, press the 2 high button and shift into drive while it is still flashing. I will worry about it more when it blows up. You can drive with the vehicle showing the solid neutral and it seems to make no difference. It has to be a wake up problem between the control modules. It only happens on start up.

Posted on Sep 06, 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

Where is the speed sensors located on a 2001 Tahoe


Vehicle Speed Sensor (VSS) - Allison
On the left side of the transmission
Automatic Transmission Electronic Component Views in Automatic Transmission - Allison
Automatic Transmission Inline Harness Connector End View in Automatic Transmission - Allison
Vehicle Speed Sensor (VSS) - 4L60-E
On the left side of the transmission
Automatic Transmission Electronic Component Views in Automatic Transmission - 4L60-E
Automatic Transmission Related Connector End Views in Automatic Transmission - 4L60-E
Vehicle Speed Sensor (VSS) - 4L80-E
On the left side of the transmission
Automatic Transmission Electronic Component Views in Automatic Transmission - 4L80-E
Automatic Transmission Related Connector End Views in Automatic Transmission - 4L80-E
Vehicle Speed Sensor (VSS) - Transfer Case
On the top left side of the transfer case
Transfer Case Control Component Views in Transfer Case - NVG 246 - NP8 (Two Speed Automatic)
Transfer Case Control Connector End Views in Transfer Case - NVG 246 - NP8 (Two Speed Automatic)
Vehicle Speed Sensor (VSS) Adapter (4WD Only) - 4.8L,5.3L,6.0L
On the left side of the transmission
Engine Controls Component Views in Engine Controls - 4.8L,5.3L,6.0L
Engine Controls Connector End Views in Engine Controls - 4.8L,5.3L,6.0L
Vehicle Speed Sensor (VSS) Adapter (4WD Only) - 8.1L
On the left side of the transmission

Mar 07, 2016 | Cars & Trucks

1 Answer

Where is the speed sensor located on my 2008 Wrangler x 3.8 5-speed manual trans?


why? got DTC errors? please post them. just curious , me too.
5speed stick, there is no such transmission here. ok JK08 ,usa.
4wd?

mine is 6 speed stick, the 5speed option is the automatic.
6sp is DEH trans.or NSG 370
with NV241 transfer case.
my wild guess is its really a 6 speed manual, with 4wd.
am I correct>?
and is USA, not an Export.
my fsm does not cover, 6 speed VSS, oops.
i wonder if the VSS on the 6peed, uses speed from the ABS.
the automatic vss is on the left side of the tranny case. and input speed and engine rpm speed. but that is A/T.

M/T as your post clearly states is another matter.
the parts list for the 370 box shows no sensors at all ,just 1 reverse switch, then i look at the car 241 transfer case then the parts list.
it too , dont have a sensor. only , 4wd switch and is not a speed sensor.
so that leaves 3 more,
front axle, no.
rear axle ,no (only a lock up switch option)
leaving what, ABS.
must be the genius at JEEP said, one day, well gee abs knows speed, why not just get that for free on all 4speeds.

the A/T needs the sensors to shift right, but not any manual ever.

The electric drawings for jeep jk08 show no speed sensors at all on the M/T. (dedicated to forward speed via the transmission side)

see here a nice JK08 full parts list in PDF.
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

Apr 10, 2015 | 2008 Jeep Wrangler

1 Answer

How do I turn 4wd on?


    • 1 Start your Dodge truck's engine.
    • 2 Turn the electronic transfer case from "2WD" to "4WD Lock" to engage the high range 4WD, if the dodge truck is equipped with an electronic transfer case; otherwise, shift the transfer case lever from "2H" to "4H." The electronic transfer case is located on the instrument panel and is marked with "2WD," "4WD Lock" and 4WD Low." The lever-equipped transfer case is located to the right of your leg and is marked with "2H," "4H" and "4L."
    • 3 Shift the transmission into "Neutral" while the vehicle is either stopped or rolling at 2 to 3 mph to begin engaging in the low range 4WD. Turn the electronic transfer case to "4WD Low," if the Dodge truck is equipped with an electronic transfer case; otherwise, shift the transfer case lever from "2H" or "4H" to "4L."
    Tips & Warnings
    • Indicator lights will come on and alert you that your vehicle is in either the high or low range of 4WD.
    • Do not engage in the low range of 4WD drive if the transmission is in gear; you must shift to "Neutral" first.
    • Many Dodge trucks allow you to shift from 2-wheel drive to the high range of 4WD at up to 55 mph--consult your truck's manual to ensure that this is possible. Do not exceed 55 mph while engaged in the high range of 4WD. Do not exceed 25 mph while engaged in the low range of 4WD.
    • Do not engage in 4WD unless you are on slipper or rocky roads.

Sep 02, 2011 | 2005 Dodge Dakota

1 Answer

"Service 4WD" dash light comes


Sounds like a defective electronic shift motor for the transfer case. The diff and t-case fluids should be replaced every 30K but will never turn on serv 4wd light.

Feb 20, 2011 | Dodge Dakota Cars & Trucks

1 Answer

Fluid capacities and fluid specs


2000 TOYOTA TACOMA 2.7L 4-cyl Engine Code 3RZ-FE

Engine Oil Grade 1......API* All TEMPS......5W-30 Optional ..10W-30
Engine, 2WD, with filter..........5.5 liters
Engine, 4WD, with filter..........5.4 liters

Manual Transmission,......GL-5/ GL-4 All TEMPS......75W-90
Automatic Transmission,A340E......AF3 / A43D......AF3

Differential, Front/ Rear W/ ADRD......GL-5 ALL TEMPS......75W-90
Differential, Front Less ADRD......GL-5 ALL TEMPS......80W-90

Transfer Case,......GL-4/GL-5 ALL TEMPS......75W-90 Gear oil.

Capacity:
Cooling System, Initial Fill..........8.5 liters
Automatic Transmission, A340E Initial Fill..........1.6 liters
Automatic Transmission, A340F Initial Fill..........2 liters
Automatic Transmission, A43D Initial Fill..........2.4 liters
Automatic Transmission, Total Fill
4 speed A340E..........7.2 liters
4 speed A340F..........10.1 liters
4 speed A43D..........6.5 liters
Manual Transmission, ..........2.5 liters
Differential, With ADRD Front..........1.2 liters
Differential, Without ADRD Front..........1.1 liters
Differential, 2WD V6 Rear..........2.6 liters
Differential, 4WD Extra Long Rear..........2.5 liters
Differential, Short WB With LSD Rear..........2.7 liters
Differential, Short WB Without LS Rear..........2.6 liters
Transfer Case, Electronic..........1.2 liters
Transfer Case, STD..........1 liters


Feb 09, 2010 | 2000 Toyota Tacoma PreRunner

2 Answers

4wd does not work


Electronic Shift On the Fly (ESOF) Operation
The ESOF system is an electronic shift 4x4 system that allows the operator to choose between two different 4x4 modes as well as 2-wheel drive. The operator can switch between 2WD and 4WD HIGH mode at speed. To engage or disengage LOW Range, the vehicle speed must be less than 5 kph, the brake depressed, and the transmission must be in NEUTRAL.

The transfer case is equipped with an electromagnetic clutch which is located inside the case. This clutch is used to spin up the front drive-line when shifting from 2WD to 4x4 High mode at speed. When the control switch on the instrument panel is turned, the generic electronic module (GEM) recognizes that a shift has been requested and activates the electromagnetic clutch and the relays which power the transfer case shift motor. When the shift motor reaches the desired position as determined by the contact plate position inputs to the GEM, power to the shift relays and motors will be removed. When the transfer case front and rear output shafts are synchronized, the spring loaded lockup collar mechanically engages the main-shaft hub to the drive sprocket. Finally, the front axle collar is engaged and the electromagnetic clutch is deactivated.

Shift Between 2WD and 4x4 HIGH:
Shifts between 2WD and 4x4 HIGH can be made at speed. Listed below are the inputs and outputs needed by the GEM to execute a change between any of these modes.

Feature Inputs:
*4WD Mode Switch (Various resistances).
*Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open).

Feature Outputs:
*4x4 Shift Motor Relay Outputs
*Transfer Case Clutch Relay (grounded when relay is on, open circuit when relay is off).
*4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
*Cluster Indicators (ground when activated, open circuit when deactivated).

Shifting Into/Out of 4WD LOW:
When shifting into or out of 4WD LOW, the GEM requires that the vehicle speed be less than 5 kph, the brake is applied, and the transmission is in NEUTRAL.

Feature Inputs:
*4WD Mode Switch (Various resistances).
*Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open).
*VSS Sensor (Sinusoid Signal: 0.7V-20V, 2.2 Hz/mph).
Brake Input (battery voltage when brake is depress, open circuit when not activated).
*Transmission Range Sensor (grounded when transmission is in NEUTRAL, open circuit otherwise).
8Start/Clutch Depressed Input

Feature Outputs:
*4x4 Shift Motor Relay Outputs
*4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
*Cluster Indicators (grounded when activated, open circuit when deactivated).

4WD Mode Switch
A rotary switch allows the vehicle operator to choose between 2WD, 4WD HIGH, and 4WD LOW modes of 4x4 operation.

GEM Module
The Generic Electronic Module (GEM) controls the operation of the 4x4 system

Vehicle Speed Sensor
The vehicle speed sensor (VSS), mounted in the rear of the transfer case, informs the GEM of the vehicle speed.

Transfer Case Shift Motor Sense Plates

The shift motor sense plate, an integral part of the electric shift motor, informs the GEM to the positions of the transfer case

Transmission Range Sensor
Located on the left side of the transmission, this sensor informs the GEM when the transmission is in the NEUTRAL position.

Electric Shift Motor
The electric shift motor, mounted externally at the rear of the transfer case, drives a rotary cam which moves the mode fork and range fork within the transfer case to select between the 2WD, 4WD HIGH, and 4WD LOW positions.

4x4/4x2 Vacuum Solenoids
These two solenoids are attached to the upper RH side of the engine compartment dash, and alternately route vacuum to the vacuum motor which engages/disengages the center axle disconnect collar in the front axle assembly.

4x4 Shift Motor Relay
A module containing two relays which under the control of the GEM, shift the transfer case shift motor between the 2WD, 4WD HIGH, and 4WD LOW modes.

Transfer Case Clutch Relay
An electromechanical relay is used to activate the transfer case clutch within the transfer case.

Good luck and hope this helps,but start with the simple and check the fuses and wire harness. Both white/light blue stripe wires should have 12V in run. The GEM will ground the left side (closest to engine) solenoid to disengage the front axle. It will ground the the right side solenoid (closest to fender) to engage the front axle. If the GEM doesn't see Neutral it will not let the truck come out of 4Lo. If the GEM had water leaking on it it may well be the root of the problem. The shift motor only has power when the GEM sends it a signal to move the shift lever. Once the shift is completed the motor shuts off. There are 2 wires that control the shift motor. A yellow and an orange. The GEM alternates between 12v and Ground to these wires to control which way the motor turns. The GEM uses the transfer case shift relay module to control the power to the motor. There are contact plates inside the shift motor assembly that indicate the position that the shift lever is in. This is what the GEM used to know what the T-case is doing. Any one of these components can fail.







Jan 10, 2010 | 2002 Ford Explorer

1 Answer

4wd lights flashing


I know the 4wd lights flash a code and I have replaced a transfer case control module on one before but as for the clunk and engine dying maybe it is a combination of more than one problem

Jan 06, 2009 | 1998 Ford Explorer

2 Answers

91 Jeep Wrangler Sahara, 2WD won't engage, 4WD is fine!


It sounds like your driveline to the rear wheels is broken. Could be transfer case output shaft to the rear wheels has broken. Try disconnecting the rear drive shaft and see if you can turn it by hand with the transfer case engaged in 2WD. If you can turn it while the Sahara is in gear, the output shaft is no longer connected to the engine for some reason.

Dec 29, 2008 | 1991 Jeep Wrangler

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