DTCs P0641, P0642, or P0643
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The 5-volt reference 1 circuit provides 5 volts to the following sensors:
- The fuel tank pressure (FTP) sensor
- The engine oil pressure (EOP) sensor
- The fuel rail pressure (FRP) sensor