Home >> Land Rover >> 2020 >> Range Rover Velar R-Dynamic HSE >> Repair and Diagnosis >> General Information >> Specifications Index >> Diagnostic Trouble Code Index DTC: Tow Bar Control Module (TBCM) -- Range Rover Velar/L560 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: TOWBAR Control Module (TBCM) (G2010985) >> B1548-23: Trailer Light Test Button - Signal stuck low >> Possible Causes