Home >> Jaguar >> 2012 >> XK 2D Convertible >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Diagnostic Trouble Code Index DTC: Transmission Shift Module (GSM) -- XK/X150 >> Diagnostic Trouble Code Index DTC: Transmission Shift Module (GSM) >> Description And Operation >> Gear Shift Module [GSM] >> DTC B123F-01: Adaptive Speed Limiter Mode Indicator - General Electrical Failure >> Possible Causes