Home >> Jaguar >> 2012 >> XKR 2D Convertible >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Engine Control Module (ECM) 5.0L SC V8 -- XK/X150 >> Diagnostic Trouble Code Index DTC: Engine Control Module (ECM) 5.0L SC V8 - AJ133 >> Description And Operation >> Engine Control Module [Pcm] 5.0L SC V8 - AJ133 >> DTC P0126-26: Insufficient Coolant Temp For Stable Operation - Signal rate of change below threshold >> Possible Causes