Transmission

P0715 — Input/Turbine Speed Sensor Circuit Malfunction

Severity: medium Drive with care, to a shop

What P0715 means

The input/turbine speed sensor reads how fast the transmission input shaft is turning. The control module compares it with the output speed and engine rpm to calculate gear ratio, detect slip, and time shifts. P0715 sets when that signal is missing, erratic, or doesn't make sense against engine and vehicle speed.

Symptoms

  • Check Engine light on
  • Harsh or erratic shifting
  • Limp mode, stuck in one gear
  • Speedometer erratic or not working
  • Poor fuel economy
  • No upshifts
  • Jerking when shifting into Drive or Reverse

Possible causes

  1. Failed input/turbine speed sensor
  2. Damaged wiring or corroded sensor connector
  3. Signal wire shorted to power or ground, or open circuit
  4. Damaged reluctor ring or input shaft
  5. Low or contaminated transmission fluid, metal debris on the sensor tip
  6. Faulty transmission control module (TCM) or PCM
  7. Internal transmission damage

How to diagnose

  1. Scan all codes and freeze-frame data, noting any output speed sensor or communication codes
  2. Check transmission fluid level and condition: color, smell, debris
  3. Inspect the sensor harness and connector for chafing, moisture, corrosion, and oil
  4. Compare turbine speed in live data with engine rpm and vehicle speed while driving
  5. Test sensor resistance and check for shorts to ground per factory specs
  6. Check wiring continuity to the TCM, plus power and ground supplies
  7. Remove the sensor and inspect the tip for metal debris or damage, and check air gap
  8. If the sensor and wiring are good, inspect the reluctor ring and transmission internals

Common fixes

  • Replace the input speed sensor
  • Repair wiring or replace the connector
  • Change transmission fluid and filter, and address the source of contamination
  • Replace the reluctor ring or input shaft during transmission repair
  • Replace or reprogram the control module only after confirming it is at fault

P0715 on different brands

Ford · manuals
On some 2024-2025 Ford applications you may see the extended code P0715:12, meaning the TSS circuit is shorted to battery voltage; it describes the detected condition, not a confirmed failed part.

Questions and answers

Can I drive with a P0715 code?

Only briefly and carefully, such as to a repair shop. The transmission may enter limp mode and shift harshly, which speeds up wear.

What most often causes P0715?

Most often it's a failed input speed sensor or damaged wiring or connector. Less often it's dirty fluid, a damaged reluctor ring, or a control module.

Can I just clear the P0715 code?

It will come back until the cause is fixed. Find the fault first, then clear the code and road-test the transmission.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.