04 silverado 4wd service light on

4wd co321

By cruisesinc
February 12, 2015 in Gen III & Gen IV V8 Engines (LS-Based)

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cruisesinc

Posted February 12, 2015

2004 silverado 5.3 4wd transfer case in neutral, push button switch inop, code co321, tried transfer case endcoder motor, switch, programmed tccm to latest calibration, service 4wd light on, when clear code comes back right away. need a flow chart or trouble tree chart

thanks

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