P1127 Buick ECTS Actuator Power Source Circuit Malfunction
Possible causes
– Faulty Electronic Throttle Control System (ETCS) Actuator
– Electronic Throttle Control System (ETCS) Actuator harness is open or shorted
– Electronic Throttle Control System (ETCS) Actuator circuit poor electrical connection
– Electronic Throttle Control System (ETCS) Actuator harness is open or shorted
– Electronic Throttle Control System (ETCS) Actuator circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1127 Buick Description
Battery positive voltage is supplied to terminal +BM of the Engine Control Module (ECM) even once when the ignition switch is OFF for the electric Electronic Throttle Control System (ETCS) control system.
If the P1127 Buick code is stored, the ECM shuts down the power for the ETCS motor and the magnetic clutch, and the ETCS valve is fully closed by the return spring.
However, the opening angle of the ETCS valve can be controlled by the accelerator pedal through the ETCS cable.
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