Home >> Jaguar >> 2013 >> XF 3.0, AWD >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Integrated Suspension Control Module (ISCM) -- XF/X250 >> Diagnostic Trouble Code Index: Integrated Suspension Control Module DTC: Integrated Suspension Control Module (ISCM) >> Description And Operation >> DTC C1A27-29: Compressor Circuit - Signal invalid >> Possible Causes