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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 254 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L, Or 6.2L - DTC P069F To DTC P3449) >> DTC P1400 >> Circuit/System Verification

Circuit/System Verification

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  1. Allow the engine to cool.
  2. Start and idle the engine for at least 2 minutes.
  3. DTC P1400 should run and pass.
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