2003 Chevrolet Suburban 4WD...Service 4wd message...AND car won't start when it has less than about 1.2 tank of gas...holds 34...acts like it is empty with around 10 or 12 gallons left...this is a guess, as usually put in 4 to 5 gallons from a can, then go fill up and it takes then only 17 or 18 to fill up!
Do you know how to do scan tool diagnostic's ? Checking DTC'S - diagnostic trouble codes , viewing input data to the computers on the vehicle . The fuel sending unit is located inside the fuel tank ,it is a input to the PCM - engine computer . The PCM use's this fuel level info . to be able to conduct testing procedures for the evaporative emission system.
The Evaporative Emission Control System (EVAP) is used to prevent gasoline vapors from escaping into the atmosphere from the fuel tank and fuel system. The EVAP system usually requires no maintenance, but faults can turn on the Check Engine light and prevent a vehicle from passing an OBD II plug-in emissions test..
Shorted sensors can cause all kind of problems .including bring down the five volt reference circuit inside the PCM . Also checking for DTC'S in the 4X4 control module should have been done before replacing parts . Your best bet ,take it to a qualified repair shop.
Do you know which transfercase your vehicle has ?
The NVG 246 EAU transfer case features a 4 button shift control switch located on the instrument panel.
The BW 4482 transfer case features a 3-button shift control switch located on the instrument panel.
Just replacing parts is not the way to a fix . Both systems can set a number of DTC'S
DTC B0790
DTC B2725
DTC C0306
DTC C0327
DTC C0329
DTC C0359
DTC C0550
The NVG 246 EAU transfer case
DTC B0790
DTC B2725
DTC C0300
DTC C0305
DTC C0306
DTC C0321
DTC C0327
DTC C0359
DTC C0374
DTC C0379
DTC C0550
Do yourself a favor ,have a qualified repair shop diagnose the problem . An you can't just replace the 4X4 control module an expect it to work .It needs to be programmed .
Transfer Case Shift Control Module Reprogramming
Remote Programming Feature
Connect the scan tool to the vehicle.
Power-up the scan tool and select the Service Programming feature.
Select the appropriate vehicle.
Press the Request Info button on the scan tool.
Disconnect the scan tool from the vehicle and connect the scan tool to the computer station.
Follow the menu select items for reprogramming and provide information as to what type of device you are programming and whether you are reprogramming or replacing the electronic control unit (ECU).
Select "vehicle" from the selection menu.
Select the module you wish to Program.
Select "Normal" for Programming Type.
Select the applicable software calibrations.
Transfer data file to the scan tool.
Reconnect the scan tool to the vehicle.
Turn ON the ignition, with the engine OFF.
Select the Service Programming feature on the scan tool.
Press the Program button on the scan tool.
SOURCE: 4WD Hi does not work on 96 Chevy K1500 Suburban
we had this same problem, under the car there is a modular,near the transfer case, it just unlugs and plug a new one in.20 min.. it is approx. $80.00 item,$ 350.00 to have it done. we were in yellowstone when we had this problem. hope this helps
SOURCE: 02 Suburban Service 4WD light on periodically. Humming
Sounds like CV joint, or wheel bearing
SOURCE: 4wd
I dont know how familar you are with 4wd but have you tried to put it in 2wh and put the truck in reverse for about 15 to 25 feet?Try that and let me know what happens and sounds you hear.Ill also need to know if you have push button or on the floor.
SOURCE: I tried to put a 2001 chevy suburban 2500 in four
check the actuator in the front diff to see if it is working
SOURCE: Will a 1994 chevy 4l80e 4wd swap into a 1995 GMC
with a little tooling around im sure itll fit ,you might have to change the tail to trans case then again its a chevy so bolt it in
Subject:
Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set, No Communication with TCCM (Reprogram Transfer Case Control Module)
Models:
2004 Buick Rainier
2002-2004 Chevrolet TrailBlazer, TrailBlazer EXT
2003-2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2002-2004 GMC Envoy, Envoy XL
2003-2004 GMC Sierra, Yukon, Yukon XL
2004 GMC Envoy XUV
2002-2004 Oldsmobile Bravada
with Electronic Shift or Active Transfer Case (RPOs NP1, NP4 or NP8)712 views
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