Faulty input/turbine shaft speed sensor; Damaged, chafed or corroded wiring between the sensor and the control module; Poor connection at the sensor or transmission connector, including water or fluid ingress; Low, degraded or contaminated transmission fluid, or metal debris on a magnetic sensor tip; Damaged reluctor ring or internal transmission fault such as a slipping clutch drum preventing a valid speed reading; Faulty transmission control module or software fault.

P0717

Input/Turbine Shaft Speed Sensor A Circuit No Signal.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
7: AreaTransmission
17: FaultThe specific fault in that area

What it means

P0717 means the transmission control module (TCM) or powertrain control module is not receiving a signal from input/turbine shaft speed sensor A. The module expects a speed signal whenever the vehicle is moving or the engine is driving the input shaft, and it set the code when that signal was missing or implausible compared with engine speed and output speed.

Symptoms

Gearbox stuck in one gear (limp mode), often second or third
Harsh, delayed or erratic gear changes
Speedometer or rev-related gauges behaving oddly on some vehicles
Transmission warning light or malfunction indicator lamp on
Torque converter lock-up not engaging, with higher fuel consumption
No gearshifts or the gearbox not changing out of a gear

Possible causes

Faulty input/turbine shaft speed sensorlikely
Damaged, chafed or corroded wiring between the sensor and the control modulelikely
Poor connection at the sensor or transmission connector, including water or fluid ingresslikely
Low, degraded or contaminated transmission fluid, or metal debris on a magnetic sensor tippossible
Damaged reluctor ring or internal transmission fault such as a slipping clutch drum preventing a valid speed readingpossible
Faulty transmission control module or software faultrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including vehicle speed, engine speed and gear selected
Check the transmission fluid level and condition, following the manufacturer's procedure for the model, and look for leaks
Inspect the sensor, wiring and connectors for damage, rubbing, heat damage, corrosion or fluid contamination
Check live data for input speed, output speed and engine speed while driving or on a lift, and see if the input speed reads zero or drops out
Test the sensor circuit for supply, ground, signal continuity and shorts, and check sensor resistance or signal against the manufacturer's specification, as the type varies by model
Wiggle-test the harness with live data on display to find intermittent faults
Remove the sensor if accessible and check for metal debris on the tip and damage to the reluctor ring
Check for related codes and any technical service bulletins or software updates for the specific model and gearbox

How to fix

Replace the input/turbine shaft speed sensor if it fails testing
Repair or replace damaged wiring and terminals, and secure the harness away from heat and movement
Clean, dry and refit connectors, replacing any that are corroded or contaminated
Correct the fluid level or service the transmission with the specified fluid, and repair any leaks
Repair the transmission internally if the reluctor ring or clutch components are damaged
Update or replace the control module only if an outdated calibration or module fault is confirmed

Can I keep driving?

Medium severity

The car can usually be driven carefully to a garage, but it may be in limp mode with limited gears and harsh shifts. Avoid long journeys, towing or heavy loads, as continued driving can cause further transmission wear.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.