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Home >> GMC >> 2009 >> Canyon 4D Pickup, 2.9 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 2.9L - 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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