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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0402-P2636)) >> DTC P0403 >> Circuit/System Testing

Circuit/System Testing

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Test the EGR motor High Control circuit and Low Control circuit for an open, short to voltage, short to ground, or for a faulty ECM.