P0025 fault code: 'B' Camshaft Position - Timing Over-Retarded

P0025 means “'B' Camshaft Position - Timing Over-Retarded” — a fuel and air metering fault in the powertrain.

Can I DIY?

Professional-only boundary. Do not order a P0015 solenoid for P0025 without a workshop test.

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 P0025

Do not drive until checked. Camshaft B on the P002x bank is later than commanded. Over-retarded B-cam timing here pairs with P0015, not with the B-cam actuator-circuit codes P0013 or P0023.

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

  • 'B' Camshaft Position - Timing Over-Retarded: Registration number
  • 'B' Camshaft Position - Timing Over-Retarded: Exact code P0025 and any companion codes from the same scan
  • 'B' Camshaft Position - Timing Over-Retarded: Whether the engine management light is steady or flashing
  • 'B' Camshaft Position - Timing Over-Retarded: Whether P0015 or P0023 are stored on the same scan
P00xxFuel and air metering
MOT fail riskif the warning light stays on

What does P0025 mean?

P0025 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 “'B' Camshaft Position - Timing Over-Retarded”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P0025 fail an MOT?

An illuminated engine management light is a Major MOT fail until repaired. P0025 is over-retarded cam B on the P002x bank, the pair of P0015, not a fuel shut-off code.

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

P0025 — quick answers

Is it safe to drive with P0025?

Do not drive until checked. P0025 has no verified driving guidance. Do not keep driving: Bank 2 cam-B retard needs workshop angle data. This is not a VVT-solenoid DIY.

Will P0025 fail my MOT?

An illuminated engine management light is a Major MOT fail until repaired. P0025 is over-retarded cam B on the P002x bank, the pair of P0015, not a fuel shut-off code.

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.