Diagnostic Trouble Code Chart

WARNING: This page is about a different car, the 2018 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC TROUBLE CODE DESCRIPTION - ECM

Diagnostic codes	Diagnostic items	Diagnostic code output check operation
B1571	[Reference Code Incompatibility]	Engine switch on (IG)
B1572	[IMM Circuit Failure (Except Antenna Circuit)]	Engine switch on (IG)
B1576	[EGI Control Module EEPROM]	Engine switch on (IG) Register the ECU communication ID
B1577	[IMM Control Module EEPROM]	Engine switch on (IG)

DIAGNOSTIC TROUBLE CODE DESCRIPTION - CERTIFICATION ECU

Diagnostic codes	Diagnostic items	Diagnostic code output check operation
B2784	[Abnormal antenna coil]	With the shift lever in P* the electrical key transmitter sub-assembly is held against the engine switch and an engine start operation is performed by pressing and holding the engine switch when the transmitter battery is depleted.
B278A	[Abnormal immobilizer power supply]	With the shift lever in P* the electrical key transmitter is held against the engine switch and an engine start operation is performed by pressing and holding the engine switch when the transmitter battery is depleted.
B278D	[ID code box recognition evaluation abnormal]	Always