Conditions for Setting the DTC: P0091
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- The fuel pressure regulator voltage is less than 2.7 volts with the fuel pressure regulator commanded OFF.
- The above condition is present for greater than 1 second or for a cumulative of 10 seconds.