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Home >> Chevrolet >> 2006 >> Chevy Express G2500, Van Cargo, 6.6 2 >> Repair and Diagnosis >> External Pages >> Different car >> Section 1695 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U2099 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the following modules one at a time. After each disconnect, clear the DTC, cycle the ignition key 3 times, then test for the DTC. DTC U2099 should remain current.
    • EBCM
    • Transfer case control module
    • If the DTC becomes history, replace the last module disconnected when the DTC became history.
  2. Ignition OFF, disconnect the X3 harness connector at the BCM.
  3. With the modules still disconnected, test for infinite resistance between BCM X3 terminal 19, and ground.
    • If less than the specified value, test the circuit for a short to ground.
  4. If all circuits test normal and the DTC is set as current, replace the BCM.
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