P0004 fault code: Fuel Volume Regulator Control Circuit High

P0004 means “Fuel Volume Regulator Control Circuit High” — a fuel and air metering fault in the powertrain.

Can I DIY?

Professional-only boundary. Do not substitute another regulator to 'see if the high reading clears'.

Do not DIYReviewed page boundary
ToolsSpecialist equipment

This is the conservative boundary from the reviewed code record. This page has no frozen site-wide safety grade, so it does not publish a repair route.

What to tell the garage about P0004

Do not drive until checked. The fuel volume regulator control circuit is reading higher than the allowed band. The computer has flagged an electrical high on that command path, the opposite of P0003.

Take these reviewed, code-specific details with you. They help the garage confirm the fault without turning this page into a repair procedure.

  • Fuel Volume Regulator Control Circuit High: Registration number
  • Fuel Volume Regulator Control Circuit High: Exact code P0004 and any companion codes from the same scan
  • Fuel Volume Regulator Control Circuit High: Whether the engine management light is steady or flashing
  • Fuel Volume Regulator Control Circuit High: Any melted connector, blown fuse, or recent jump-start
P00xxFuel and air metering
MOT fail riskif the warning light stays on

What does P0004 mean?

P0004 is a generic (SAE standard) powertrain code reported by your car’s engine control unit. It sits in the P00xx block, which covers fuel and air metering. The stored description is “Fuel Volume Regulator Control Circuit High”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P0004 fail an MOT?

A lit engine management light is a Major MOT fail until repaired. P0004 is a high control-circuit flag on the volume regulator, not a DPF or catalyst efficiency result.

Before booking your test, check what usually fails on your car: see our MOT pass rates by make and model, built from 33.1 million DVSA tests.

Related guides

Car diagnostic test cost: compare the scopeUK booking marketplaces currently publish diagnostic averages of about £52–£65. Engine management light on: steady or flashing?A steady engine management light means the computer has stored a fault. Drive with caution and get the code read. A flashing light is different — stop when it is safe.
P0001Fuel Volume Regulator Control Circuit/Open P0002Fuel Volume Regulator Control Circuit Range/Performance P0003Fuel Volume Regulator Control Circuit Low P0005Fuel Shutoff Valve 'A' Control Circuit/Open P0006Fuel Shutoff Valve 'A' Control Circuit Low P0007Fuel Shutoff Valve 'A' Control Circuit High P0008Engine Position System Performance P0009Engine Position System Performance

P0004 — quick answers

Is it safe to drive with P0004?

Do not drive until checked. We have no verified driving guidance for P0004. Treat as do not drive until checked. A high-circuit flag does not mean you should short or swap the regulator.

Will P0004 fail my MOT?

A lit engine management light is a Major MOT fail until repaired. P0004 is a high control-circuit flag on the volume regulator, not a DPF or catalyst efficiency result.

Fault-code identifiers are standard diagnostic facts. Their explanations and diagnostic guidance on this site are original editorial summaries, not reproduced SAE wording. MOT defect rules reflect the DVSA MOT inspection manual (2026). This page is general guidance for UK drivers, not a substitute for a professional diagnosis.