P1720 Buick Vehicle Speed Meter Circuit Malfunction
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
– TCM to ECM circuit harness is open or shorted
– VDC/TCS/ABS to ECM circuit connectors
– TCM to ECM circuit connectors
– Faulty revolution sensor
What about the obd code?
Malfunction is detected when ECM detects a difference between two vehicle speed sensor signals is out of the specified range.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1720 Buick 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.
Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue – Buick Regal – Buick Verano – Buick Enclave – Buick Encore – Buick Rainier – Buick Rendezvous – Buick Terraza – Buick Riviera