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P1B03 on the 2014 Cadillac ELR

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.

Bulletins for this model year that name P1B03
21NA2182022-02-14. Service bulletin. This bulletin provides a diagnostic service procedure to correct customer concerns of Reduced Propulsion (EREV), Malfunction Indicator Lamp (MIL) Illuminated with DTC P0C17, P1B03 and/or P0C01 Set.
PIP5246A2022-01-24. Service bulletin. This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles that have Check Engine Light illuminated with an "Engine Unavailable" and ?Reduced Propulsion? messages on the Driver Information Center. Technician will find Diagnostic Trouble Code P1B03. Technician should replace Motor 1 Stator.
PIP52462017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles that have Check Engine Light illuminated with an "Engine Unavailable" and ?Reduced Propulsion? messages on the Driver Information Center. Technician will find Diagnostic Trouble Code P1B03. Technician should replace Motor 1 Stator.
PIP5246A2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles that have Check Engine Light illuminated with an "Engine Unavailable" and “Reduced Propulsion” messages on the Driver Information Center. Technician will find Diagnostic Trouble Code P1B03. Technician should replace Motor 1 Stator.
PIP-52462015-01-14. Service bulletin. CHEVROLET/CADILLAC: WITH ENGINE UNAVAILABLE AND PROPULSION POWER REDUCED, CHECK ENGINE LIGHT IS ILLUMINATED WITH DIAGNOSTIC TROUBLE CODE (DTC) P1B03, P0C01, P0C4E AND ROUGH OPERATION WITH ENGINE RUNNING. MODEL 2014-2015 ELR, 2011-2015 VOLT. *PE

5 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.