P0715 fault code: Input/Turbine Speed Sensor 'A' Circuit

Last updated · OBDCode UK editorial

Can I drive with P0715? — Drive only if essential

Limit driving to a short trip to a gearbox specialist. If the transmission will not select a gear, slips badly, or the car will not move, stop and arrange recovery.

P0715 means “Input/Turbine Speed Sensor 'A' Circuit” — a transmission fault in the powertrain. Drive only if essential. The gearbox computer is not getting a valid signal from input (turbine) speed sensor A. Shift quality can suffer. This is a transmission-circuit fault, not a job for a driveway gearbox strip-down.

Can I DIY?

Do not DIY this repair. We do not publish DIY repair or strip-down steps for this code on this page. Read codes and observe only; leave the repair to a qualified garage.

Do not DIY this repairDIY boundary
ToolsBasic tools only — for example a household socket set, tyre gauge, or a consumer OBD reader.

This fault is in the professional-only category. We do not publish strip-down or fitting steps on this page. Use a qualified garage.

P07xxTransmission
MOT fail riskif the warning light stays on

What does P0715 mean?

P0715 is a generic (SAE standard) powertrain code reported by your car’s engine control unit. It sits in the P07xx block, which covers transmission. The stored description is “Input/Turbine Speed Sensor 'A' Circuit”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

How to diagnose P0715 yourself

  1. Confirm P0715 and companion gearbox codes: Scan with an OBD-II reader while the car is stationary, in Park or with the parking brake on. Note whether P0715 is current or pending, and list every other transmission code on the same scan. Do not road-test to reproduce a shift fault. Stop if: The gearbox will not select a gear, the car will not move, or you feel you must go under the vehicle.
    Generic driver footwell showing a broad OBD-II socket search zone and the usual 16-pin socket shape.
    Park safely and switch off before locating the socket. Its position varies, so use the vehicle handbook and never force or dismantle trim.

Will P0715 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. A gearbox that will not select a ratio can also make the vehicle unsafe to test.

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.

What the MOT data says

No MOT certificate item corresponds to this code; MOT outcome data cannot be shown.

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.
P0700Transmission Control System (MIL Request) P0701Transmission Control System Range/Performance P0702Transmission Control System Electrical P0703Brake Switch 'B' Circuit P0704Clutch Switch Input Circuit Malfunction P0705Transmission Range Sensor Circuit Malfunction (PRNDL Input) P0706Transmission Range Sensor Circuit Range/Performance P0707Transmission Range Sensor Circuit Low

P0715 — quick answers

Is it safe to drive with P0715?

Drive only if essential. Limit driving to a short trip to a gearbox specialist. If the transmission will not select a gear, slips badly, or the car will not move, stop and arrange recovery.

Can I fix P0715 myself?

Do not DIY this repair. We do not publish DIY repair or strip-down steps for this code on this page. Read codes and observe only; leave the repair to a qualified garage. Basic tools only — for example a household socket set, tyre gauge, or a consumer OBD reader.

Will P0715 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. A gearbox that will not select a ratio can also make the vehicle unsafe to test.

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.