Diagnostic Aids

Unwanted or inadvertent door lock/unlock activation may be requested by the OnStar® Remote Link application. It is possible that a customer may be unaware of account usage, resulting in an unwanted or phantom door lock/unlock. If normal system diagnosis results in an inability to verify the customer's concern, contact Technical Assistance Center (TAC).
If the vehicle has a current DTC that illuminates the malfunction indicator lamp (MIL), the cause of the DTC must be diagnosed before proceeding with the Remote Vehicle Start Inoperative diagnostic.
Only the first and second vehicle transmitters are able to control the remote vehicle start function.
The remote vehicle start system will not operate if any of the following conditions are present:
- A current vehicle DTC that illuminates the malfunction indicator lamp (MIL)
- The fuel level is low enough to cause the low fuel indicator to be active
- The vehicle is in valet mode
- On passive entry equipped vehicles, an additional key fob is left in the vehicle
- More than 2 remote starts have been attempted
- The hazard switch is in the ON position
- A current hazard switch DTC is set
- The vehicle hood is ajar
- A current hood ajar DTC is set
- A current door ajar system fault
- A vehicle door is ajar
- Incorrect BCM software is installed and vehicle start is not enabled
- The content theft deterrent system detects an alarm trigger
- Excessive engine RPM
- Excessive coolant temperature
- Accelerator pedal position greater than 0 percent
- Vehicle not in park
- Vehicle theft deterrent malfunction
- A current automatic transmission shift lock control system DTC is set
- A vehicle speed sensor signal is detected by the ECM