P0715
Input/Turbine Speed Sensor "A" Circuit Malfunction
The transmission input speed (turbine) sensor signal is missing or implausible. Without this signal, the TCM cannot detect torque converter slip or calculate gear ratio in real time, and shifts become harsh.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- Input speed sensor failedCommon
- Wiring or connector faultPossible
Parts involved
- Transmission Input Speed Sensor
- Transmission Input Speed Sensor Wiring
P0715 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.