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Home >> Hummer >> 2009 >> H3 Base, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - DTC P0218 To DTC P2771 >> DTC P150A or P150B >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the ECM connector (X3).
  2. Ignition ON, measure the voltage on the harness of the ECM connector (X3-66) for 5 V.
    • If you have 5 V, test or replace the ECM.
    • If the value is other than 5 V, test harness for:
      • Short to Voltage
      • Short to Ground
      • Open
  3. If no trouble found, replace the TCM.
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