What does the service 4WD light on a GM Truck mean?
What does the service 4WD light on a GM Truck mean?
The solid lights on the 4WD buttons are telling you where the transfer case encoder motor thinks it is, and blinks on the mode that it is trying to go to after you push the button. If it fails to move to the new position, it goes back to a solid light on the original position and illuminates the “SERVICE 4WD” light.
Why is my service 4WD indicator not working?
If the wires are broken, the actuator won’t operate and the actuator won’t move. If it does not move to the proper position, the buttons on the dash will blink and the “Service 4WD” indicator will be lit because the TCCM never sees a complete 4WD engagement. The ground wire to my front axle actuator was the culprit on my truck.
When does the service 4WD message come up?
Does the “SERVICE 4WD” message come up as soon as you start the truck, or does it only activate after you try to select a mode other than 2 Hi?
Why does the 4 wheel drive light stop flashing?
The transfer case neutral position needs to be selected before you attempt to engage 4WD. The selected position indicator light will flash until the transfer case completes the shift. When the shift is complete, the indicator light for the selected position will stop flashing and remain ON.
The solid lights on the 4WD buttons are telling you where the transfer case encoder motor thinks it is, and blinks on the mode that it is trying to go to after you push the button. If it fails to move to the new position, it goes back to a solid light on the original position and illuminates the “SERVICE 4WD” light.
If the wires are broken, the actuator won’t operate and the actuator won’t move. If it does not move to the proper position, the buttons on the dash will blink and the “Service 4WD” indicator will be lit because the TCCM never sees a complete 4WD engagement. The ground wire to my front axle actuator was the culprit on my truck.
Does the “SERVICE 4WD” message come up as soon as you start the truck, or does it only activate after you try to select a mode other than 2 Hi?
Why is my DTC 4WD light not working?
Some people say they have an intermittent illumination of the Service 4WD light. Upon inspection the technician may find DTC C0374 set. The customers may also say they have an intermittent erratic operation of the 4WD. You may notice the problem may occur on rough road or when wet conditions are present.
What to do if your 4WD truck won’t start?
If nothing happens when you push a button (no changes to the lights, and no noises from under the truck), the buttons may have failed. Check every function for response: 2HI, Auto4WD, 4HI, 4LO, Neutral. Pull the dashboard apart (it is just held with clips) and pull out the buttons.
Why are there no lights on my 4WD?
2006 silverado 1500. 4×4 would not engage on mine. I would receive service 4wd message on dash and 4wd switch would change light locations randomly. Changed swich and it did not fix the problem.
Why are there no lights on the selector switch?
I know this is an old thread but still very informational. On a 99 silverado 5.3 the switch lights would not come on also it was stuck in 2wd.l I replaced the actuator on the transfer case, checked the 4wd fuse in the cab, replaced the switch and the TCCM. Still no lights and no 4wd.
Why is my 4WD service light not working?
It would engage into lower gear in 4lo but wouldn’t actually go into 4wd. Taking a closer look at the wires, I noticed that there is a small ground wire that was hidden in the tube that got unconnected. Simply put a new connector on it and works like a charm now! I hope this helps you with your 4wd service light issue!
Are there lights on the transfer case selector switch?
Service 4wd and no lights… the lights on the transfer case selector switch in the dash no longer comes on. it does flash when turning the key to start the truck, but it remains in two wheel drive. Ive changed the selector switch, but that did not work.
Why does the service 4WD light come on?
When the Service 4WD indicator lights up it’s telling us there’s a problem related to the Transfer Case Shift Control Module, the appropriate Diagnostic Trouble Code has been stored in the control module’s memory, and it’s gonna shutdown 4×4 operation to prevent additional damage.
Can a faulty 4WD selector light be repaired?
However, don’t anticipate making a drive down to your local Chevrolet dealer or mechanic for help just yet. Using just a few handy troubleshooting tips and inexpensive materials, you can usually diagnose and repair a faulty 4WD selector light in about 15 minutes to an hour.
How often should I switch my 4WD selector?
To avoid having your 4WD selector light come on and go off at random, it’s recommended that you switch your vehicle into 4WD at least once a month and properly maintain your transfer case fluid. When the engine is cool, remove the drain and fill plug at the bottom of your transfer case, which should be facing your rear axle.
I know this is an old thread but still very informational. On a 99 silverado 5.3 the switch lights would not come on also it was stuck in 2wd.l I replaced the actuator on the transfer case, checked the 4wd fuse in the cab, replaced the switch and the TCCM. Still no lights and no 4wd.
Why does my dash say service 4 wheel drive?
Service 4 wheel drive in dash indicator comes on and lights go out on the transfer case switch nob. If I turn off the engine and wait for 10 min. then start truck everything is ok. and I can turn nob to whatever location I want and it will shift.
What is the GM service 4 wheel drive message?
GM has issued a service bulletin # 09-04-21-001 to address a Service 4 Wheel Drive Message condition on the vehicles listed below. In addition to the Service 4 Wheel Drive Message, you may also have a C0387 or a C0569 trouble code stored.
Why does my GMC Sierra 1500 say service 4WD?
Having similar issues as above, had to drive the truck in 4wd high for a short period of time without the rear drive shaft, heard a clunk and the service 4wd message came on, the front drive shaft quit which left me stranded.
Where are the DTCs on a GM 4WD?
History and current DTCs are displayed on different menus (History menu shown here). DTCs will stay in memory for 100 key cycles. The dash buttons to the right of the air vent identify this system as an NVG 246 automatic two-speed, which means it has DTCs and scan tool capabilities.
Service 4 wheel drive in dash indicator comes on and lights go out on the transfer case switch nob. If I turn off the engine and wait for 10 min. then start truck everything is ok. and I can turn nob to whatever location I want and it will shift.
How often does the 4WD light come on on a Silverado?
Question: I have a 2005 Chevrolet Silverado and my SERVICE 4WD light comes on about once a week. When the light is on, the truck won’t engage into 4-wheel drive. When I turn my truck off and start it again, the 4-wheel drive will work until the next time the light comes on.
