OPL DRC Reader is dedicated app to read OBDII DTC errors in Opel / Vauxhall / Chevrolet vehicles with CAN BUS (HS-CAN), produced after 2004:

-Opel / Vauxhall
Insignia
Astra J
Astra H - Engine Module Only
Vectra C / Signum - Engine Module Only
Others - not tested

-Chevrolet
Orlando
Cruze - not tested
Others - not tested

-Others GM brand vehicles
Not tested

Application could show you VIN, Engine Code etc and list of founded errors in
-Engine Controll Module (ECU)
-Bodu Control Module (BCM)
-Transmittion Control Module (TCM)

Application could also read mileage from some modules (avilable in some vehicles).

CAUTION
For proper operation requires a compatible ELM327 Bluetooth interface in min version 1.3
Application could not work with low quality ELM327 clones.
You can check compatibility of yours interface by ELM Identifier application from Google Play: https://play.google.com/store/apps/details?id=com.applagapp.elm327identifier