Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Problems for specific Chevrolet Impala years:
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Repairpal verified 2011 Chevrolet Impala problems
The transmission pressure control solenoid may fail causing erratic shifting. Our technicians tell us that partial dis-assembly of the transmission is necessary to replace a failed pressure control solenoid.
An engine oil leak may develop from the front crankshaft seal. Our technicians tell us a revised front crankshaft seal is available to correct this concern.