Home >> Jaguar >> 2017 >> XJR L >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Automatic Temperature Control Module (ATCM) -- XJ/X351 >> DIAGNOSTIC TROUBLE CODE (DTC) INDEX DTC: Automatic Temperature Control Module (ATCM) >> Description And Operation >> Automatic Temperature Control Module (ATCM) >> DTC U2101-56: Control module configuration incompatible - Invalid/incomplete configuration >> Possible Causes