Fuel volume regulator control circuit low. Seen in 2 real diagnostics across 2 workshops.
What the code tells you on its own
- System. Powertrain. Engine, fuel, air, ignition, emissions and transmission. The overwhelming majority of what workshops bring to the AI.
- Functional group. Fuel pressure and delivery
- Subsystem. Fuel and air metering
- Failure type byte, when the tool sends one. 00 (No sub-type information). Scan tools report the same fault as P0003 and as P0003xx, where xx is a sub-type. They are one fault, and whether the sub-type appears depends on the tool and the protocol rather than on the car.
What we see when P0003 turns up
Measured across the diagnostics run through Wrenchlane by independent workshops, not taken from a reference table. Sightings span March 2026 to May 2026.
- 2 diagnostics carried this code.
- 2 separate workshops met it, so this is not one shop seeing the same fault repeatedly.
- 50% of the time it arrived with no symptom description at all, meaning the technician had nothing but the code to work from.
- Most often on Citroen, which is where we have seen it most rather than a claim about the fleet at large.
What this page does not tell you
A code names a symptom the car noticed, not the part that failed. P0003 on one vehicle and the same code on another can have different causes, and the counts above describe what independent workshops brought to us rather than how common the fault is across all cars. Getting from the code to the cause needs the vehicle: its make, model, engine and what it is actually doing.
Run P0003 against the car in front of you. Enter the code and the symptoms and get ranked probable causes for that specific vehicle, with the checks in the order worth doing them. Free account, no card.
Other fuel pressure and delivery codes
- P0087, Fuel rail/system pressure too low
- P0193, Fuel rail pressure sensor circuit high
- P0001, Fuel volume regulator control circuit open
- P0090, Fuel pressure regulator 1 control circuit
- P008A, Low pressure fuel system pressure too low
- P0089, Fuel pressure regulator 1 performance