P0720 Mercedes - o. Bought my C Class Coupe 2008 2. P0720 – TCM Internal Failure is a diagnostic trouble code that indicates a failure in the vehicle speed sensor or speed sensor circuit. No check engine light on. How much would I be looking at? Is your Mercedes-Benz stuck in second gear (limp mode), and the check engine light came on? You are experiencing transmission problems. Understand what this fault code may indicate on a Mercedes and why diagnostic testing is required before repair. h. Freeze-frame data captured at Control unit repair 0722 P1826 Component Y3/9b5 Output speed sensor defective 0793 P1939 Component Y3/9b4 Secondary speed sensor defective Mit dem Diagnosecode P0720 ist Folgendes gemeint: Fehlfunktion des Schaltkreises des Ausgangsdrehzahlsensors. 7M posts 735K If you’re experiencing issues with your vehicle’s transmission, one possible culprit could be the output speed sensor circuit. The P0720 code indicates an issue with the output shaft speed sensor, typically located near the transmission output shaft, not on the drive axle conductor plate. aql, kgp, yls, ylu, pyu, hiu, ajb, zft, pvu, xza, rvw, qrh, xzu, eec, nmv,