Home › Land Rover › 2017 › Range Rover SVAutobiography › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Tire Pressure Monitoring System Control Module (TPMSCM) -- Range Rover/L405 › Diagnostic Trouble Code Index DTC: Tire Pressure Monitoring System Control Module (TPMSCM) › Description And Operation › DTC C1A56-85: Left Front Tire Pressure Sensor and Transmitter Assembly - Signal above allowable range › Possible Causes