OBD-II trouble code
P0001: Fuel Volume Regulator Control Circuit/Open
SAE J2012: fuel volume regulator control circuit/open. Circuit/Open is a fixed value or no response, including the case where a separate high test and low test are not both used. On the 2016 Ford 6.7L and 3.2L diesel summary the trigger is a control-chip voltage of 2.8–4.8 V with the valve not energized. Leave every high-pressure fitting closed while you test the circuit.
Quick facts
- System
- Powertrain
- Category
- Fuel and Air Metering
- Severity
- High severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $2,600 – $4,000 (diesel injection pump replacement)
- DIY difficulty
- Advanced DIY
Browse every code in P0001–P0099, or start from the full code library.
What does P0001 mean?
The volume regulator, also called a fuel volume control valve or suction control valve, meters how much fuel the high-pressure pump is allowed to compress. P0001 says the control circuit did not respond, or the voltage on that circuit sat at a fixed value the monitor calls an open. SAE's Circuit/Open definition is wider than a broken wire. P0003 is circuit low and P0004 is circuit high, on vehicles that use those numbers.
The 2016 Ford 6.7L and 3.2L diesel OBD summary, revision 15 May 2015, sets P0001 when the volume control valve is not energized and the control-chip voltage is 2.8–4.8 V, against a normal 5 V secondary supply. The Ford EcoSport 2.0L Duratec-HE high-pressure fuel page sets P0001:00 when the PCM sees high or low voltage on the fuel volume regulator and its return. The same page says not to apply battery voltage across the fuel-injection-pump circuits, because that can damage the regulator solenoid. That warning is on the 2018 F-150 pinpoint introduction for the gasoline direct-injection vehicles that introduction lists.
On the Ford gasoline pinpoint pages reproduced for the 2012 Taurus, Fiesta, Flex 3.5, and Mustang, the coil is measured on the component side of the unplugged pump connector, ignition off, at operating temperature and again after a cold soak. Those pages' table is 0.3–3.1 ohms at operating temperature and 0.3–1.1 ohms after the cold soak. Out of that table, those pages install a new fuel injection pump, not a separate valve. Do not use 0.3–3.1 ohms on an engine that is not in that pinpoint.
Common causes
- An open or a short in the volume-regulator circuit, which is what the EcoSport chart is measuring
- A connector at the pump with a terminal that is not latched, or with corrosion
- A regulator coil outside the resistance table in the Ford gasoline pinpoint for the 2012 Taurus, Fiesta, Flex 3.5, and Mustang
- A control-chip voltage of 2.8–4.8 V with the valve off, the 2016 Ford 6.7L and 3.2L diesel trigger
- A module driver, after the coil and the wiring match the chart for this engine
- A pump replaced because a resistance table from a different engine was used
Symptoms
- Check engine light, and on some diesels a no-start or a stall
- Hard start or a limit on power when rail pressure cannot be met
- The code returns as soon as the circuit test runs
- No fuel leak, because this test does not require a fitting to be opened
- P0003 or P0004 stored with it when this module also has low and high tests
- A coil that was damaged after battery voltage was put across the pump circuits, the failure the EcoSport notice warns about
Diagnostic steps
- 1.Leave the high-pressure fittings closed. The rail stays pressurized after shutdown. Every electrical check on this list is done with the fuel system sealed. If a later procedure tells you to open a line, relieve the pressure the way that procedure describes before any fitting is loosened, and keep a source of ignition away from the fuel.
- 2.Record the code and the fuel-pressure codes beside it. P0087 and P0088 are pressure results. They are not this circuit test. On the 2016 Ford diesel summary, rail-pressure learning is a different code.
- 3.Ignition off. Unplug the regulator or the pump connector and inspect both halves. Do not feed the solenoid from the battery. The EcoSport page and the 2018 F-150 introduction both say that damages the regulator.
- 4.Measure the coil on the component side, ignition off. On the 2012 Taurus, Fiesta, Flex 3.5, and Mustang pinpoint, compare operating-temperature resistance with 0.3–3.1 ohms and a cold-soak reading with 0.3–1.1 ohms. Any other engine uses its own table. Out of the Ford table, those pages replace the fuel injection pump.
- 5.With both ends of the control wire disconnected, check continuity end to end and check for a short to ground and to power. Measuring only at the module, with the pump still plugged in, reads through the coil.
- 6.Move the harness at the pump while you watch the reading, ignition off for resistance. A value that changes is a wire, not a pump.
- 7.Replace the part the chart names. On those Ford gasoline pages the part is the pump when the coil is out of the table. On a diesel, the volume control valve is a separate part only when the catalog sells it that way. Clear the code and confirm the circuit test passes without opening a fitting.
Repair cost
$2,600 – $4,000 (diesel injection pump replacement)
RepairPal's diesel injection pump replacement averages $2,630–$4,034, parts and labor, estimates updated 3 September 2026 (labor $734–$1,076, parts $1,896–$2,958). The printed pair rounds that average. The page describes a gear-driven or belt-driven diesel injection pump. It is not a wiring repair, and it is not a separately sold volume-control valve. No parts-and-labor total for a volume-control valve, or for the gasoline fuel-injection pump the 2012 Ford pinpoint installs, was found on RepairPal, YourMechanic, AutoZone, FIXD, or CarParts. RepairPal's in-tank fuel-pump estimator is a different job and is not used here.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with fuel pressure regulator replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an advanced DIY job. It typically requires specialty tools, scan-tool access, lifting equipment, or careful sequencing to avoid causing new failures. Plan for extended downtime and have a backup vehicle. Most owners are better served by a shop that has done this repair before.