U0101Wysoki
Utrata komunikacji z TCM (sterownik skrzyni)
Komunikacja sieciowa
Sprawdź szczegóły →P1720
WysokiVehicle speed sensor (VSS) circuit fault — no signal or incorrect signal from the speed sensor transmitted to the engine control module (ECM) via the CAN bus.
OBD-II (EN): Vehicle Speed Sensor Circuit Malfunction
Code P1720 signals a fault in the vehicle speed sensor (VSS) circuit — the engine control module does not receive a correct speed signal via the CAN bus. This can manifest as incorrect speedometer operation, problems with the automatic transmission, or activation of limp mode. Due to the high severity of the fault and its impact on driving safety, diagnostics at an authorized service center as soon as possible are recommended.
Symptoms
Check Engine light (MIL) illuminates on the dashboard. Incorrect speedometer readings or no reading. Problems with automatic transmission (incorrect gear shifts, no downshift on demand). Activation of automatic transmission limp mode. Incorrect operation of traction control (TCS) or stability control (ESP/VSC). Increased fuel consumption due to incorrect engine management strategy.
Possible causes
Damaged vehicle speed sensor (VSS) — mechanical or electrical damage to the sensor. Damaged VSS sensor wiring harness — open or short circuit. Poor electrical contact in the speed sensor connector (corrosion, loose plug). Damaged engine control module (ECM) or automatic transmission control module (TCM) — rare. Problems with the CAN bus — disturbances in communication between modules. Damaged VSS sensor tone wheel (impulse ring) — chips, contamination.
Affected systems
Vehicle Speed Sensor (VSS)Engine Control Module (ECM)Transmission Control Module (TCM)CAN Bus / Communication NetworkSkrzynia automatycznaSpeedometer / Instrument ClusterTraction Control System (TCS)Electronic Stability Program (ESP/VSC)
Related codes
P0500Średni
Czujnik prędkości pojazdu (VSS) — usterka
Układ napędowy
Sprawdź szczegóły →U0100Krytyczny
Utrata komunikacji z ECM (sterownik silnika)
Komunikacja sieciowa
Sprawdź szczegóły →Does code P1720 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.