P1720 – Vehicle Speed Meter Circuit Malfunction

P1720 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1720 Possible Causes

VDC/TCS/ABS to ECM circuit harness is open or shorted,TCM to ECM circuit harness is open or shorted,VDC/TCS/ABS to ECM circuit connectors,TCM to ECM circuit connectors,Faulty revolution sensor

P1720 Description

The Engine Control Module (ECM) receives two vehicle speed sensor signals via the Control Area Network (CAN) communication line. One is sent from Vehicle Dynamic Control (VDC) / Traction Control System (TCS) / Anti-Lock Brake System (ABS) control unit, and the other is from Transmission Control Module (TCM). ECM uses these two signals for engine control.