MasterTuning Fault code dictionary (DTC)

P0001 — Fuel Volume Regulator Control Circuit Open

Severity: Warning Can you drive? With caution: limp mode possible, have it checked soon Make: All makes (OBD-II standard)
MeaningThe engine computer noticed an open circuit in the wiring or control module for the fuel volume regulator. This means the computer cannot properly control the amount of fuel flowing to the high-pressure pump.
FamilyPowertrain (P)

Typical symptoms

Check Engine light is on
Engine may crank but fail to start
Engine may stall or lack power while driving

Common causes

Disconnected or damaged wiring connector at the fuel volume regulator
Broken wire or corrosion in the regulator circuit
Faulty fuel volume regulator
Internal issue in the engine control module

What to do

Have a technician check the wiring plug and harness leading to the fuel volume regulator as soon as possible. Since this affects fuel delivery, the car may become unreliable or undriveable.

Frequently asked questions

What does code P0001 mean?

Fuel Volume Regulator Control Circuit Open. The engine computer noticed an open circuit in the wiring or control module for the fuel volume regulator. This means the computer cannot properly control the amount of fuel flowing to the high-pressure pump.

Can I keep driving with code P0001 active?

With caution: limp mode possible, have it checked soon

Common causes — P0001

Disconnected or damaged wiring connector at the fuel volume regulator Broken wire or corrosion in the regulator circuit Faulty fuel volume regulator Internal issue in the engine control module

How do you fix code P0001?

Have a technician check the wiring plug and harness leading to the fuel volume regulator as soon as possible. Since this affects fuel delivery, the car may become unreliable or undriveable.

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