Home >> Jeep >> 2023 >> Wagoneer Carbide, RWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating And Air Conditioning (ATC) - DTCS U0140-00 To U1519-00 >> DTC Troubleshooting >> U1009-00-Lin 2 Bus >> Default Action