Possible causes – Faulty Powertrain Control Module (PCM)– Powertrain Control Module (PCM) harness is open or shorted– Powertrain Control Module (PCM) cicuit poor electricl connection– Low battery voltage Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0601 BUICK OBD Code Description The Powertrain Control Module (PCM) EEPROM contains data which is essential…