Psa Interface Checker 4.4.0

$ psa-interface-checker --target https://mypsa.company.com --oauth-client-id svc_api --oauth-scope "read:projects write:time"
[✓] OAuth token acquired (expires in 3599s)
[✓] Dependency check: auth/health → 200 OK
[✓] GET /api/v4/projects → 200 OK (schema valid)
[⚠] POST /api/v4/time/entries → 429 (throttled) – rate limit 100/min exceeded
[✗] GET /api/v4/reports/billing → 500 Internal Server Error
Health score: 67/100
Errors: CONTRACT(1), THROTTLE(1), AUTH(0), TIMEOUT(0), DEPENDENCY(0)
Report written to psa_check_20260120_143022.json

Installing version 4.4.0 requires attention to detail. Follow this guide to avoid driver conflicts. psa interface checker 4.4.0

Even with a stable release, issues occur. Here are the top five error codes in 4.4.0 and how to fix them.

| Error Code | Message | Solution | |------------|---------|----------| | E-101 | USB device not recognized | Reinstall FTDI chip drivers using Zadig or CDM v2.12.28. Avoid Windows Update drivers. | | E-204 | VCI handshake timeout | Your interface may have a counterfeit FTDI chip. Use FTCleaner tool to reset EEPROM. | | E-307 | Vehicle voltage unstable | Start the engine. Check OBD pin 16 (12V) and pin 4/5 (ground). PSA vehicles need >11.8V. | | E-412 | Protocol mismatch (CAN vs K-Line) | Manually set protocol in checker: Click “Advanced” → For pre-2010 PSA, choose “ISO9141-2 (K-Line)”. | | E-509 | Log write permission denied | Run checker as Administrator. Also check C:\ProgramData\PSA\Logs is not read-only. |

It is vital to understand that this checker does not replace DiagBox. Here is the comparison: $ psa-interface-checker --target https://mypsa

Workflow Rule: Always run Interface Checker 4.4.0 before launching DiagBox. If the Checker passes, but DiagBox fails, your DiagBox software installation is corrupt. If the Checker fails, don't waste time with DiagBox.

Absolutely. Without this tool, you are flying blind. A common mistake is assuming your interface is broken when the problem is a simple driver mismatch or low battery. PSA Interface Checker 4.4.0 removes the guesswork. Installing version 4

Pros:

Cons:

Machine-readable output includes:

Stellantis has hinted at a new diagnostic architecture for 2025, moving toward cloud-based VCI management. However, the PSA Interface Checker 4.4.0 will likely remain relevant for at least another five years due to its offline capability. No version 5.0 has been announced as of this writing. Therefore, mastering 4.4.0 is a long-term investment for any PSA specialist.