DTC Codes
DTC CHART
| DTC | Description |
|---|---|
| DTC 1-1 | OnStar Control Unit Internal Error (DSP Communicate Error, CPU Or DSP Memory Error) |
| DTC 1-2 | OnStar Control Unit Internal Error (EEPROM error) |
| DTC 1-3 | GPS Receiver Error |
| DTC 1-4 | Telephone Module Error |
| DTC 2-1 | OnStar Control Unit Lost Communication With SRS Unit (Collision Detection Signal Error) |
| DTC 2-3 | GPS Antenna Circuit Malfunction |
| DTC 2-4 | Cellular Phone Antenna Circuit Malfunction |
| DTC 2-5 | OnStar Switches (Four Buttons) Circuit Malfunction |
| DTC 2-6 | Microphone Circuit Malfunction |