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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (3 Of 5)) >> Diagnostic Information and Procedures >> DTC P1089 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different variant/trim than selected.

For an overview of the component/system, refer to: Fuel System Description

Component Description
K20 Engine Control Module The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.
Q18 Fuel Pressure Regulator A solenoid valve is an electro-mechanically operated valve. The valve is controlled by an electric current through the solenoid.

Q18A Fuel Pressure Regulator 1 & Q18C Fuel Pressure Regulator 3@G18 Fuel Pump - High Pressure 

The fuel pressure regulator is a solenoid valve that controls the pressure in the fuel rail by restricting the flow of fuel from the high pressure pump.

Q18B Fuel Pressure Regulator 2@Fuel Rail 

The fuel pressure regulator is a solenoid valve that controls the pressure in the fuel rail by restricting fuel returning to the fuel tank.