Car Problem Reports

GMC Sierra 2500 HD 4WD Transfer Case Position Sensor/Selector Switch May Fail

GMC Sierra 2500 HD Problem
15 Reports
Me Too

Model Years Affected: 2001, 2002, 2003, 2004, 2005, 2007, 2008

Drive Trains Affected: 4WD, 5 Speed Transmission, 4WD, 6 Speed Transmission

Average Mileage: 135,108 mi (91,000 mi - 194,291 mi)


The 4WD transfer case encoder motor position sensor or the selector switch may fail causing the service 4WD message to be displayed. Fault code(s) stored in the transfer case control module will be of assistance in determining the exact fault causing the message to be displayed.

  • Visitor, , 4WD, 6 Speed Transmission, 91,625 mi

    the 4 wheel drive works but every now and then the service 4 wheel drive light comes on. Is it easy to fix and how expensive is it

    Flag This
  •  Rookie

    Hey all. This morning like most mornings I used my automatic start to start my truck to warm her up (08 GMC Sierra 2500HD 6.6L SLT Z71). After letting her warm up I got out to get in and its roughly around 32 degrees. I get in and go to put her in drive and get a "Service 4 Wheel Drive" message in my DIC. I have never had this message pop up before. I tried turning her off then turning her back on, same message. Then it says put in N to reset, I tried that and nothing happened. The indicator light on the 4 wheel driv not illuminated as usual and the truck won't go into gear and drive at all. I checked the 4 wheel drive system fuse and it seem to be ok. Any Ideas??? And help would be much appreciated

    Flag This
  • Visitor, , 194,291 mi

    4 by 4 switch will not engage, when truck is started n appears on switch then shuts off, display says service 4 wheel drive, when put into gear a rough jerking motion starts and truck seems to not want to shift up and in reverse truck will suddenly come to a lock stop and not want to back up anymore

    Flag This
  • Visitor, , 91,000 mi

    Light just came on while in 4WD.

    Flag This
  •  Rookie

    2004 silvarado crew cab, 100000 miles, service 4 wheel drive message, code c0306, stuck in 4hi, cleaned ground on body mount no change.

    Flag This
  • Visitor, , 165,000 mi

    Same above.

    Flag This
Ask a Question