P0715: Input/Turbine Speed Sensor — Diagnosis
Key Takeaway
P0715 relates to the transmission input speed sensor. Here's what it does and how it fails.
What P0715 Means
The input/turbine speed sensor monitors how fast the transmission input shaft is spinning. The TCM uses this to calculate shift points and torque converter slip.
Symptoms
| Symptom | Why |
|---|---|
| Harsh or erratic shifting | TCM can't calculate correct shift points |
| Speedometer malfunction | Speed calculation affected |
| Limp mode (stuck in one gear) | TCM defaults to safe mode |
| Check engine light + P0700 | TCM stored a fault |
| No tachometer reading | Sometimes linked |
Common Causes
| Cause | Fix Cost |
|---|---|
| Failed speed sensor | $100 – $250 |
| Wiring damage/corrosion | $50 – $200 |
| Poor electrical connection | $0 (clean connector) |
| Contaminated transmission fluid | $100 – $200 (fluid change) |
| Internal transmission issue | $1,000+ |
ProHow Steer Helps
Steer reads P0715 and monitors transmission data to help distinguish a sensor failure from an internal issue.
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