GM
Type:
    Network - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    CAN Bus Error ECM (4L30-E Transmission) Conditions
Cause:
    Key on and the TCM did not receive ECM messages for 1 second

GM
Type:
    Network - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    CAN Bus Error ECM (4L30-E Transmission) Conditions
Cause:
    Key on and the TCM did not receive ECM messages for 1 second