Question about 1999 Chevrolet Silverado 1500

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Service 4WD light illuminates on the dashboard message box

Service 4WD light reads on the dashboard message box, intermittently but will stay lit once it turns on until engine is turned off. Upon restart it may take some time for it to illuminate again but will stay on again until engine is turned off. The electronic shift still works for engaging 2WD to 4WD Hi & Lo.

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  • Greg Williamson Aug 03, 2012

    It is a 2009 1500 silverado

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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

Posted on Sep 27, 2009

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Check the fluid in the transfer may be low or need to be changed also check for loose connections at the shift module either problem most common cause for service light to come on.

Posted on Sep 27, 2009

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Service 4wd bad accelerator


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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Jun 23, 2012 | 2000 Chevrolet Blazer

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Service 4wd light appears on message box and the push buttons won't work. how can i find the problem in a cheap way? I don't really have money to blow on replacement parts. It's a 99'...


THis information from TS Bulletin...

Subject: "Service 4WD" Indicator Illuminated, DTC B2725 Set (Replace Transfer Case Shift Control Switch)
Models: 1999-2002 Chevrolet and GMC C/K Pickup and Utility Models (Silverado, Sierra, Avalanche, Suburban, Tahoe, Yukon, Yukon XL)
with Four Wheel Drive and NVG 236/246 Transfer Case (RPO NP8)

Condition: Some customers may comment on the Service 4WD indicator illuminating. Upon investigation, the technician may find DTC B2725 set.

Cause: The condition may be due to a intermittent fault in the transfer case shift control switch.

Correction:
Important: The transfer case shift control module should not need replacement. DO NOT replace P/N 15749703 unless diagnosis points to the module as the malfunction.

Replace the transfer case shift control switch using published Service Information procedures.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer. Thank you for using Fixya, and have a nice day.

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4wd service flashed on dashboard


sometimes a fuse might be going bad.....thus leading to lights turning on...i wouldnt pay too muc attention to the light unless it comes on more frequently or stays on. if so definitly get it checked out.

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Don't mess with it!!!!! Your new vehicle has a warranty. Get back to the dealer ASAP and don't take anything apart. You paid good money .... let them tear their hair out.....that's what they get paid for!!!!

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