What do these codes mean and what do I do to fix this

Asked by MrDisasterNR May 10, 2020 at 12:14 AM about the 2009 Chevrolet Malibu LS FWD

Question type: Maintenance & Repair

My 09 Malibu is showing codes P0621 and
U0121.

2 Answers
41,240

TDolby answered 4 years ago

code P0621 means that the powertrain control module, PCM has detected a malfunction with the generator lamp control circuit. U0121 means the Data bus: anti lock brake system ABS control module no communication. This is set when communication between the ABS brake system control module and the PCM is lost for a specified time.

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41,240

TDolby answered 4 years ago

As far as fixing? Have you done anything to the car recently, has it been in water, etc?

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