P1721 Buick Gear 1 Incorrect Ratio

P1722 Buick Gear 2 Incorrect Ratio

Possible causes
– Vehicle speed sensor harness is open or shorted
– Vehicle speed sensor circuit poor electrical connection
– Faulty Vehicle Speed Sensor
What about the obd code?
There is a big difference between the vehicle speed signal from the ABS actuator and the electric unit (control unit), and the vehicle speed sensor signal.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1722 Buick Description

The vehicle speed signal is transmitted from ABS actuator and electric unit (control unit) to Transmission Control Module (TCM) via Control Area Network (CAN) communication line.

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