C1118 Chevrolet Silverado 2500 HD

This DTC will set as current DTC, if one of the following conditions is true for more than 1 second

1. The TBCM detects an open in the user gain switch circuit.
2. The TBCM detects short to ground in the user gain switch circuit.
3. The TBCM detects short to battery positive in the user gain switch circuit.