Well, being a 4WD vehicle, I have to ask, Which Speed Sensor? The ones for the ABS, Transfer Case or Transmission? Any codes stored? Any 4WD issues or "Service 4WD System" messages? Need more info to help you.
Ok. That code relates to the Rear Wheel Speed Sensor Circuit, which is also the Vehicle Speed Sensor. It is the one located on the Transfer Case output shaft housing which is wherwe the rear driveline attaches. There are a couple of engineering bulletins for this condition. If you email me your email and the vehicle VIN # (I only need the last 8 digits of the VIN) I will send you the bulletins, diag code chart and wiring schematics so you can try to figure it out. Don't throw parts/money at it until you know what you need. Could be the connector / wiring harness or the sensor or possibly the PCM or EBCM. My email is ChevyASE@aol.com