Input/Turbine Speed Sensor Circuit Intermittent
Your transmission's speed sensor is sending spotty signals to the engine computer, like a radio station that keeps cutting in and out. The ECU can't reliably measure how fast the transmission input shaft is spinning, which affects shift timing and quality.
The ECU monitors the turbine/input speed sensor signal voltage for a continuous AC waveform proportional to transmission input shaft speed. When the signal drops out intermittently or shows inconsistent frequency, the ECU detects the fault. The sensor typically generates 0–5V pulses that the ECM uses for transmission adaptive learning and shift scheduling.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Signal Frequency | Continuous AC signal increasing with shaft speed | Signal dropouts, noise spikes, or loss of signal for >500ms |
| Voltage Stability | Clean 0–5V transitions | Erratic voltage transitions or stuck voltage |
Code P0719 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0719 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.