2001 GMC Sierra 2500 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2001 GMC Sierra 2500
2001 GMC Sierra 2500 Problems
One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.
A clicking noise may be noted from the turn signal flasher after the turn signals are switched off. This is commonly cause by a faulty turn signal switch which will require replacement.
The 4WD transfer case position sensor or the selector switch may fail causing the service 4WD message to be displayed.
2001 GMC Sierra 2500 Questions
I have a 2001 GMC 1500 4.8l and I am getting 11-12 mpg's on the highway, could this be an 02 sensor? My air filter is new, plugs, wires, and fuel filter are also new.