This Preliminary Information communication provides information to the technician about vehicles that may have a Service Vehicle Soon on, a Reduced Power Mode Message, or the vehicle will not start. Technician may find Diagnostic Trouble Code P1EAB stored. Technician should not clear the Diagnostic Trouble Code. Technician will need to use Global Diagnostic System 2 to review Hybrid Powertrain Control Module 2 Freeze Frame / Failure Records for DTC P1EAB. If the maximum cell voltage is not greater than 4.58 V, check to see if the Battery Engine control Module has the latest Service Programming System calibration. If there is a new calibration available for the battery engine control module then the module should be updated. If the battery engine control module cell voltage displayed in the Freeze Frame / Failure Records or the live cell voltage is over 4.58V, then follow currently published in Service Information. If the latest calibration is already installed or the battery engine control module has been reprogrammed previously and the concern is intermittent, contact General Motors Technical Assistance Center for further assistance.
