Diagnostic Procedure with Cancel Code: 64

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

Malfunction related to engine is detected.
Abnormal decrease in engine speed is detected during cruise driving.

If the malfunction indicator light remains on or blinks, perform the diagnosis for engine. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE

If the malfunction indicator is not remaining on/blinking, this cancel code may be detected due to malfunction of the ECM. In this case, restart the engine and perform the cruise control setting operation again. If the cancel code is not detected, it is normal. (Temporary malfunction)