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C1AB5 on the 2013 Toyota Avalon

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 C1AB5
T-SB-0039-132018-04-23. Service bulletin. Some 2013 model year Avalon and Avalon HV vehicles may display a ?Check Blind Spot Monitor System? message on the multi-information display with Diagnostic Trouble Code (DTC) C1AB4 and/or C1AB5 stored. The procedure in this bulletin has been developed to address this condition.
T-SB-0039-13 Rev2018-04-02. Service bulletin. Some 2013 model year Avalon and Avalon HV vehicles may display a ?Check Blind Spot Monitor System? message on the multi-information display with Diagnostic Trouble Code (DTC) C1AB4 and/or C1AB5 stored. The procedure in this bulletin has been developed to address this condition.

2 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.