The alert displayed in the dashboard. I flushed the transmission and serviced the transfer case. Message still appears. Is something else required, or is there a way to reset this alert. Does it appear based on 1) mileage, 2) time, or 3) the detection of some problem in the system?
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Re: Service 4WD system alert
Probably based on miles... Any dealer or competent shop can re-set the alert... Have them show you where it is so you know for next time (usually under the dashboard on drivers side but they move that stuff around so much, I can't tell you where it is exactly on your vehicle)
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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.
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Which transfer case does your truck have ?
Transfer Case Description and Operation for the Transfer Case - NVG 149-NP3
Transfer Case Description and Operation for the Transfer Case - NVG 246-NP8
Transfer Case Description and Operation for the Transfer Case - NVG 261-NP2
Transfer Case Description and Operation for the Transfer Case - NVG 263-NP1
The SERVICE 4WD indicator is located in the instrument panel cluster (IPC), and shares the common power and ground of the IPC. The transfer case shift control module controls the service indicator by sending the IPC a Class 2 message. This indicator may be controlled with the scan tool using the IPC device controls.
You should take it to the dealer an have it checked for DTC'S -diagnostic trouble codes
A blinking service 4x4 light would indicate there are DTC'S - diagnostic trouble codes set . Need a professional scanner to pull these codes , not autozone or advance etc.... How many buttons on the shift selector ? Four or three - this would tell me which transfer case it has an capabilities .
The NVG 263 transfer case features a three button shift control switch located on the instrument panel.
The NVG 236/246 transfer case features a 4 button shift control switch located on the instrument panel
Both systems have a electronic control module .
SERVICE 4WD Indicator
The SERVICE 4WD message is displayed on the driver information center and is an integral part of the cluster and cannot be serviced separately. This message is used to inform the driver of the vehicle of malfunctions within the automatic transfer case (ATC) system. The SERVICE 4WD message is controlled by the transfer case shift control module via a Class 2 message.
Upon seeing this message it is intended for the driver of the vehicle to take his vehicle to a qualified repair shop that has the knowledge an diagnostic equipment to trouble shoot the problem .
These systems can set many codes an without knowing which or if any are set at all you could end up replacing parts an still not fix the problem .
Your best bet , take it to a qualified repair shop .
This indicates that a problem exists in the control system of the 4WD system. This can be mechanical like a sticking clutch in the transfer case or electrical in nature. You need to have the dealer do special testing to determine what is the actual cause. If you have never changed the fluid in the transfer case do that and see if the light is mechanical in nature from dirty fluid and a sticky cone clutch
Hi there: The FDCM has a code, and for me to be able
to correctly diagnose your vehicle..You will need to get that code
retrieved by a scantool.\.
The service 4WD indicator gives an indication to the vehicle operator when the Final Drive Control Module (FDCM) has recorded a Diagnostic Trouble Code (DTC) for an electronic transfer case circuit or component malfunction. This indicator is controlled by the instrument cluster logic circuit based upon cluster programming and electronic messages received by the cluster from the FDCM over the Controller Area Network (CAN) data bus.
The service 4WD indicator function of the reconfigurable dot matrix Organic Light Emitting Diode (OLED) display unit is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the OLED service 4WD indication will always be OFF when the ignition switch is in any position except ON or START. The instrument cluster will turn ON the service 4WD indicator for the following reasons:
Service 4WD Indicator Lamp-On Message - Each time the cluster receives an electronic service 4WD indicator lamp-ON message from the FDCM, the service 4WD indicator will be illuminated. The indicator remains illuminated for about five seconds, until the cluster receives a lamp-OFF message from the FDCM, until the cluster arbitrator logic determines that another display request has priority, or until the ignition switch is turned to the OFF position, whichever occurs first.
The FDCM continually monitors the electronic transfer case control circuits and transfer case shift motor/mode sensor assembly to determine the condition of the system. The FDCM then sends the proper lamp-ON or lamp-OFF message to the instrument cluster, also known as the Cab Compartment Node (CCN).
For proper diagnosis of the FDCM, the CCN, the CAN data bus or the electronic communication related to service 4WD indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.
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You definitely need to have it serviced & checked out...The service 4WD indicator read across my screen, but I did not have serviced...Eventually, I heard a grinding noise & because I didn't have it serviced when I took it in, it was found that the transfer case had no tranfer case fluid at all...This damaged the transfer case which had to be replaced (used transfer case-$400.00)....The transfer case is part of your transmission...The shape mine was in could have broke my transmission...Have it taken care off before it gets too bad...You must use only GMC Transfer Case Fluid
this is most commonly a electrical problem, does the speedometer read out correctly? if not it may be depending on if this is a Autotrak model, one f the two speeed sensors, or the acuator on the front diff, put the truck in 4wd, check the front dirveline to make sure it is engaing, if not your problem is in the t-case, if it does then move to the tires, if they are not engaged you have a problem with the actuator.
in most cases i have found the actuall 2wd 4wd switch to be the problem if you find that the switch is acting slow or you need to select the gear a few times before it shifts, then replace it these are very faulty