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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U0073 or U2100 >> Circuit/System Verification
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Circuit/System Verification

  1. Refer to Data Link References  to determine which serial data system is used for a specific module.
  2. This DTC cannot be retrieved with a current status. Diagnosis is accomplished using the symptom Scan Tool Does Not Communicate with High Speed GMLAN Device  or Scan Tool Does Not Communicate with Low Speed GMLAN Device .
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