Hey all, I have a '05 4.2 AWD EXT with the dreaded SERVICE 4WD LIGHT lit on the cluster. My brother-in-law has access to a TECH2, and was able to read the code, confirm the selector switch was functioning, but nothing else. Neither of us are proficient with the tool.... Anyhow, in the past I have had several AWD harness issues which caused me to re-run several wires down the harness which solved the other issues. This time I checked continuity of each circuit from the encoder to the connector under the hood, and all 7 were good. It could be the encoder motor, but I'd rather not just replace parts and hope. So 2 questions:
- Can the encoder motor be bench tested?
- What else could a C0321 be?