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Home >> Buick >> 2009 >> Allure Super >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System & Fuel System - 5.3L - DTC P0420 To DTC P3449 >> 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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