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2009
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Envoy 4.2 S, 4WD
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System & Fuel System - 4.2L - DTC P0366 T0 DTC P2544
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DTC P2544
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Circuit/System Testing
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
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.