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Gary, GMC Technician
Category: GM
Satisfied Customers: 17150
Experience:  15 years gm master tech/15 years ASE master tech
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GM hummer h2: How do i turn off the 4wd. On a hummer 2003

Customer Question

How do i turn off the 4wd. On a hummer 2003 h2
Submitted: 2 years ago.
Category: GM
Expert:  Gary replied 2 years ago.
Welcome! My name is ***** ***** I will do my best to assist you with this problem.
this has a push button in the dash for the 4WD with the truck ON what position does the switch show the transfer case in ?
Customer: replied 2 years ago.
Im not sure which button should be on.
Customer: replied 2 years ago.
Service 4wd. Keeps popping up on the dashboard.
Expert:  Gary replied 2 years ago.
this set up in this truck is a 2 speed full time 4WD
it can not be put into 2WD
if the service 4WD is popping up a shop must pull the codes out of the 4WD computer and off the code set diagnose the problem
when that is popping up the 4WD computer is seeing a problem in the system
this can range from a bad switch to possible updating the programing in the 4WD module to possible encoder motor on the transfer case to a speed sensor being incorrect
very hard to tell which area without knowing the code set
During normal driving situations, the transfer case operates in the 4HI mode. When the 4HI mode is selected, the transfer case shift control module sends 12 volts to an electrical motor, which is the transfer case encoder motor. This motor rotates the transfer case shift detent lever shaft which moves the shift forks and range sleeve to obtain different modes/ranges.
The BW 4484 transfer case has the added feature of also providing the driver with 3 manual mode/range positions:
4HI -*****High Open
4HI Lock -*****High Locked
4LO Lock -*****Low Locked
The driver may choose to select any of these mode/range positions while driving the vehicle. However, the transfer case will not allow a shift into or out of 4LO Lock unless the following criteria has been met:
The engine is running.
The automatic transmission is in Neutral.
The vehicle speed is below 5 km/h (3 mph) .
This transfer case also has a Neutral position. A shift to the Neutral position allows the vehicle to be towed without the transmission output shaft rotating. Refer to the Owners Manual for instructions for proper towing of the vehicle.
Neutral position may be obtained only if the following criteria have been met:
The engine is running or the ignition is ON.
The automatic transmission is in Neutral.
The vehicle speed is below 5 km/h (3 mph) .
The transfer case is in the 4HI mode.
Once these conditions have been met, press and hold both the 4HI and 4LO Lock buttons for 10 seconds . When the system completes the shift to Neutral, the red Neutral indicator illuminates.
The BW 4484 transfer case has one other additional feature along with the 3 modes. The Electronic Rear Differential Lock can only be used in the 4LO Lock mode with a vehicle speed at or below 32 km/h (20 mph) .