Fuel Volume Regulator Circuit Open


This code indicates that an open circuit has been detected in the electronic fuel volume regulator or wiring system.

Code Set Parameters

Parameters are displayed as “open or closed” circuit. Closed system operation is normal, an open circuit is faulty. Most likely cause: wildlife damage to wiring and/or connectors.


Malfunction indicator lamp is illuminated and a trouble code is stored.

Common Causes

This code is often set in error and should be verified by resetting the code and operating the vehicle to determine if it is valid. Some brands of code readers detect this code in error, so using two different brands is a good idea if this code is presented. Once the code is reset, if it should return, inspect the electrical connector and wiring at the fuel rail for a fault. Malfunctions in this area can often be attributed to wildlife/rodent damage.

Common Misdiagnosis

Since this code is frequently read in error and rarely set, all other codes should be addressed prior to proceeding with a diagnosis for this code. The fuel volume regulator and powertrain control module (PCM) are typically replaced in error when attempting to diagnose this code.


  • When attempting to diagnose this code multiple scanners/code readers may be necessary
  • Some diagnostic equipment may exhibit this code in error; therefore the actual existence of the code must be verified by using a scanner or code reader of a different brand. Begin your diagnosis by visually inspecting all wiring and connectors
  • Look for shorted or burned wiring and replace circuitry and connectors as required
  • If the system wiring, connectors, and components appear to be in normal working order, connect the scanner to the diagnostic connector and record all stored trouble codes and freeze frame data
  • This information can be extremely helpful in diagnosing intermittent conditions that may have contributed to this code being stored
  • After the codes are cleared, operate the vehicle to see if the code returns
  • If the code fails to immediately return, you may have an intermittent condition
  • Intermittent conditions can prove to be quite a challenge to diagnose and in extreme cases may have to be allowed to worsen before a correct diagnosis can be made. If it is determined that conditions are present to store a P0001 and the code is indeed present, power, ground, and sensor voltage should then be measured
  • If no inconsistencies are found in circuitry voltage, resistance should be tested in system wiring and in the electronic volume control regulator
  • If all system circuitry and component readings are within specifications, then a faulty PCM could be the culprit
  • Keep in mind that this scenario is very rare and more this than not this code is exhibited in error.