Read VIN and ECU Information with OBD2 Mode 9

OBD CAN’s Vehicle Information screen reads the identification fields that a compatible vehicle exposes through standard OBD2 Mode 9. It can help you record a VIN, ECU name, Calibration ID (CALID), or Calibration Verification Number (CVN) for a service conversation or a reference check.

Run a read-only Mode 9 check

  1. Sign in and connect a compatible BLE OBD2 adapter to the vehicle.
  2. Open Vehicle Information and tap Read Vehicle Information.
  3. Wait while the app initializes the adapter and requests available Mode 9 data from the ECU.
  4. Review any VIN, ECU name, CALID, and CVN returned. Missing fields may display as unavailable if the vehicle does not provide them.
  5. Use the report menu to copy the report or save an image. The history control can reopen a saved result later.

The screen reads identifiers. It does not write, code, program, or reflash an ECU.

Example: confirm an ECU identifier

Before discussing a service bulletin, an owner might record the vehicle’s CALID and VIN from Mode 9. They compare those identifiers with manufacturer service information or provide them to a repair shop. If no identifier is returned, they ask the shop to verify it with an appropriate tool. A CVN or CALID by itself cannot prove that an ECU has or has not been tuned, changed, or tampered with; use documented procedures and qualified inspection.

What the result can and cannot tell you

Mode 9 values are whatever the vehicle ECU reports through the adapter. Availability and formatting vary by make, model year, ECU, and protocol. A blank field is not a failed vehicle check. The screen does not provide odometer mileage, accident records, ownership history, maintenance history, or a full vehicle history report. VIN display alone does not authenticate the vehicle or establish condition.

Access and privacy

Reading requires sign-in, a compatible BLE OBD2 connection, and paid membership. The adapter is sold separately; iOS does not support classic Bluetooth or Wi-Fi. Saved reports are kept in local, account-associated device storage. Reviewing one does not require reconnecting the car, but the report is not cloud-synchronized to other devices.

Frequently asked questions

Why is the VIN missing?

The ECU may not expose a VIN through the requested Mode 9 response, or the connection may not have returned a readable value. Retry once and ask a repair shop to confirm if needed.

Can CVN prove ECU tampering?

No. It is an identifier/check value that needs comparison with reliable manufacturer data and a proper inspection.

See all standard OBD2 scan sections · Learn about saved diagnostic reports

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