Conditions For Running DTC
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- DTCs U1800, and U2104 are not set.
- The engine is running.
- The charging system voltage is between 6-18 volts.