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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 503 (Transfer Case - Mp 3023/3024 (NQH)) >> Diagnostic Information and Procedures >> DTC P279B >> Circuit/System Testing

Circuit/System Testing

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  1. Observe the 4WD Signal in the ECM Data List. The 4WD signal should display Enabled when you shift into 4WD and Disabled when you shift into 2WD.
    • If the scan tool display does not match the transfer case range switch state, repair the transfer case system. Refer to Diagnostic System Check - Vehicle .
    • If the scan tool matches the transfer case range switch state, continue with testing.
  2. Program the ECM with the latest software version and retest for DTCs.
    • If the DTC resets, replace the ECM.
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