DTC P1720: Vehicle Speed Sensor (A/T Output): Description

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If DTC P1720 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000, Refer to DTC U1000, U1001: CAN COMMUNICATION LINE . .

ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from VDC/TCS/ABS control unit, and the other is from TCM (Transmission control module). ECM uses these two signals for engine control.