Psa+interface+checker+440+2021 [2026]

Run ntpdate -q on both your PSA server and the target system. If offset > 2 seconds, reconfigure NTP.

If you are still on a 2020 or earlier release, the interface checker may use outdated session handling. Upgrade to at least the 2021 feature pack to benefit from improved token management and clearer error codes. psa+interface+checker+440+2021

Cause: The vehicle expects a challenge-response authentication that the interface cannot provide.
Fix: Ensure Diagbox software version is 9.xx or higher. The interface checker alone cannot bypass the gateway — you must use a software version that supports Stellantis SGW. Run ntpdate -q on both your PSA server