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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 404 (Engine Controls And Fuel - 6.2L (LT4) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information And Procedures >> DTC P129F >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

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

Component Description
K111 Fuel Pump Power Control Module The control module K111 supplies the fuel pump with a 3-phase voltage in order to achieve the desired pump speed required for building fuel line pressure. - Fuel Pump Driver Control Module Fuel Pump Speed Signal Incorrect - Speed = Error
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.

Communicating - Class 2 Serial Data - Fuel Pump Speed - Between the following control modules: K20 Engine Control Module & K111 Fuel Pump Driver Control Module = Not within a calibrated range.

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