P0091 - Fuel Pressure Regulator '1' Control Circuit Low

System Information

Fuel Pressure Regulators are used to control and regulate the fuel system pressure to ensure a steady and sufficient supply of fuel depending on the current engine load. The ECM will normally operate some form of electrical solenoid / motor to regulate the fuel pressure based on feedback provided by the fuel pressure sensor.

Fault Code Explained

The ECM has detected that the Fuel Pressure Regulator Control Circuit is below it’s minimum parameter or is below what is expected for the current operating conditions.

Recommended Tests

Due to the variety of systems and methods used for Fuel Pressure Control it is recommended to follow the manufacturers test plan for this fault code.

The following are some of the general tests that should be carried out