Home >> Land Rover >> 2022 >> Defender 90 >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Audio Amplifier Module (AAM) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Audio Amplifier Module (AAM) (G2804413) >> Description And Operation >> Audio Amplifier Module (AAM) >> DTC U201B-56: Control Module Calibration Data #2 - Invalid/incomplete software component >> Possible Causes