P1129 Buick Manifold Absolute Pressure Sensor Circuit Higher Than Expected

Possible causes

– Faulty Swirl control valve control solenoid valve
– Swirl control valve control solenoid valve circuit is open or shorted
– Swirl control valve circuit is open or shorted
– Faulty swirl control valve
– Faulty Swirl control valve actuator

What about the obd code?

The P1130 Buick code is detected when an improper voltage signal is sent to Engine Control Module (ECM) through swirl control valve control solenoid valve.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1130 Buick Description

This system has a swirl control valve in the intake passage of each cylinder.

While idling and during low engine speed operation, the swirl control valve closes. Thus the velocity of the air in the intake passage increases, promoting the vaporization of the fuel and producing a swirl in the combustion chamber.

Because of this operation, this system tends to increase the burning speed of the gas mixture, improve fuel consumption, and increase the stability in running conditions.

Also, except when idling and during low engine speed operation, this system opens the swirl control valve. In this condition, this system tends to increase power by improving intake efficiency via reduction of intake flow resistance, intake flow.

The solenoid valve controls swirl control valve