Diagnostic Aids
WARNING: This page is about a different car, the 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, 2002 Chevrolet Monte Carlo, and 2002 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
DTC P1380 set indicates that the Anti-Lock Brake System (ABS) system has detected a malfunction which will not allow the EBCM/EBTCM to transmit correct rough road data to the PCM. Refer to Diagnostic System Check - ABS in appropriate ANTI-LOCK article in BRAKES.