Home >> Jaguar >> 2012 >> XK 2D Convertible >> Repair and Diagnosis (Single Page) >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code: Central Junction Box (CJB) -- XK/X150 >> Diagnostic Trouble Code Index DTC: Central Junction Box (CJB) >> Description And Operation >> Central Junction Box [CJB] >> DTC U3000-49: Control module - Internal electronic failure >> Possible Causes