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check engine light on 2009 Chevrolet Impala

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check engine light came on while driveing and said reduced power. Car seems to be running properly what am I to be consurned about
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sometimes check engine lite and traction lite comes on after starting.reduced power.can remove battery cable erases codes and runs fine for about month does same thing on start up again after codes are erased car runs normal.
Was it the battery that needed replacement? Or a new starter or alternator?