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Home >> GMC >> 1997 >> Forward Control 4.3 W, L35, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 60 (Engine Controls - Tests W/Codes - 5.7L (G Series)) >> Diagnostic Trouble Codes >> DTC P0172 - Fuel Trim System Rich Bank 1 >> Diagnostic Aids

Diagnostic Aids

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If problem can not be isolated during diagnostic procedures, monitor LT fuel trim value while operating vehicle under various load conditions. A condition that causes DTC P0300 may also result in DTC P0172 setting. Also, an extreme rich condition that may cause DTC P0172 to set may result in P0300 setting due to misfire at idle. If cause for DTC P0172 can not be determined and DTC P0300 is also set, go to DTC P0300  .

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