P0048 fault code: Turbo/Super Charger Boost Control Solenoid Circuit High

P0048 means “Turbo/Super Charger Boost Control Solenoid Circuit High” — a fuel and air metering fault in the powertrain.

Can I DIY?

Professional-only boundary. Confirm P0048 on a reader; do not swap boost and bypass solenoids.

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 P0048

Do not drive until checked. The boost-control solenoid circuit is electrically high. The computer sees excess voltage on the turbo/supercharger boost solenoid. Distinct from P0035, which is the bypass valve, not this solenoid.

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

  • Turbo/Super Charger Boost Control Solenoid Circuit High: Registration number
  • Turbo/Super Charger Boost Control Solenoid Circuit High: Exact code P0048 and any companion codes
  • Turbo/Super Charger Boost Control Solenoid Circuit High: Whether the engine management light is steady or flashing
  • Turbo/Super Charger Boost Control Solenoid Circuit High: Whether a recent solenoid or wastegate repair was done
P00xxFuel and air metering
MOT fail riskif the warning light stays on

What does P0048 mean?

P0048 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 “Turbo/Super Charger Boost Control Solenoid Circuit High”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P0048 fail an MOT?

An illuminated engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. P0048 does not change that lamp rule.

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 P0004Fuel Volume Regulator Control Circuit High 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

P0048 — quick answers

Is it safe to drive with P0048?

Do not drive until checked. We have no verified driving guidance for P0048. Escalated: do not drive until that high solenoid circuit is checked. Stop if boost feels uncontrolled.

Will P0048 fail my MOT?

An illuminated engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. P0048 does not change that lamp rule.

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.