C0077 - Chassis Fault Code C0077 - ABS / Bromssystem (Hjulhastighetssensorer & Ventiler)

DTC C0077 indicates that the ABS/ESC or TPMS module has detected a low tire pressure condition or wheel circumference anomaly. In direct TPMS, wheel-mounted pressure transducers transmit RF data (433/315 MHz) indicating pressure below the calibrated threshold. In indirect TPMS, the ABS module continuously calculates wheel roll-radius and tire resonance frequencies using high-resolution active Wheel Speed Sensor (WSS) current pulses. A pressure drop reduces tire radius, causing a persistent rotational speed deviation across axles.