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Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - DTC P1400 To DTC P2635 >> DTC P2544 >> Circuit/System Testing

Circuit/System Testing

Observe the DTCs in the scan tool.

If DTC P0604 is set, replace the ECM.
If DTC P0604 is not set, replace the TCM.

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