P0715 Input/Turbine Speed Sensor A Circuit Malfunction

P0715 points to an input or turbine speed sensor A circuit malfunction. The transmission controller is missing or rejecting the input-speed signal.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace shift solenoids for ratio symptoms until the input-speed signal is proven reliable.

Symptoms of P0715

Erratic or harsh shifting, or the wrong gear being selected.
Speedometer or shift-timing problems.
Limp mode in some cases.

Common causes of P0715

A failed input / turbine speed sensor.
Sensor wiring, connector, or reluctor-ring damage.
Low fluid or internal transmission wear.
A transmission-control-module fault (less common).

Useful checks before replacing parts

Compare input speed, engine speed, output speed, commanded gear, and shift timing while reproducing the fault.
Inspect sensor connector condition, air gap where applicable, wiring, metal debris, and transmission case connector terminals.
Check for related ratio, shift, or turbine-speed codes that show whether the signal is absent or merely implausible.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.