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Home › Chevrolet › 2009 › Impala SS › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 5.3L - DTC P0420 To DTC P0690 › 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.