P1564 Chevrolet Cruise Control System – Vehicle Accel Too High

Possible causes

– ASCD Steering Switch harness is open or shorted
– ASCD Steering Switch circuit poor electrical connection
– Faulty ASCD Steering Switch
– Faulty Engine Control Module (ECM)

What about the obd code?

An improper voltage signal from the Automatic Speed Control Device (ASCD) steering switch is sent to Engine Control Module (ECM).

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Automatic Speed Control (Cruise Control) system may stop working

P1564 Chevrolet Description

Automatic Speed Control Device (ASCD) (Cruise Control) steering switch has variant values of electrical resistance for each button. The Engine Control Module (ECM) reads voltage variation

of switch, and determines which button is operated.