Psa+interface+checker+440+2021

: This indicates the vehicle uses CAN-only diagnostics (most 2021 models), but the interface is stuck in K-Line legacy mode. Fix : Ground pin 3 of the OBD connector with a jumper wire for 2 seconds while powering the interface. This forces CAN mode.

or later, the PSA Interface Checker is a mandatory part of your toolkit to ensure your VCI firmware (often version 4.3.7 or higher) is compatible with the software. It is a "set it and forget it" tool—once your interface is correctly flashed to Revision C, you likely won't need it again until you update your diagnostic software suite. Are you having trouble identifying your interface's current revision , or are you looking to upgrade to a specific firmware version psa+interface+checker+440+2021

– Some clone interfaces fail the “VCI ID” test in Checker 440 but still work in Diagbox. Ignore if actual vehicle diagnostics work. : This indicates the vehicle uses CAN-only diagnostics