Speedometer is stuck at 67 mph when stopped or moving. The 4x4 will not engage even though the indicator button on the dash says it is on. My code reader only pulls up a bad O2 sensor.
Get your gearbox looked at
SOURCE: 4X4 inop on 2003 GMC Sierra 2500HD
I have found that when you are going to engauge 4x4 high, it is best to only be going about 3 miles an hour. Not faster, not stopped. It likes some movement to help it mesh. I've had perfect shifts since I started this. Hope it helps. Wade.
SOURCE: 2005 GMC Sierra 1500 crew cab - speedometer not working
This is a well known issue with model years 2003 thru 2005. There is a chance GM will replace it under recall... Call the Chevy Customer Assistance Center 1-800-630-2438 to find out.
If not and you want it fixed, try Southern Electronics at http://www.instrumentclusters.com/.
SOURCE: GMC sierra speedometer stuck at 40mph
There was not a recall, but there was a class action settlement where GM agreed to extend the warranty on certain vehicles for this problem. Check www.gmspeedometerrecall.com to see if you qualify.
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