P0717 code definition
The PCM (powertrain control module) will set the P0717 code when it detects no signal from the input/turbine speed sensor. This signal may be interrupted briefly, or it may be erratic or otherwise outside of expected manufacturer settings. In any of these cases, the PCM will record the code and turn on the Check Engine light.
What the P0717 code means
An automatic transmission is designed to match the vehicle’s engine’s best torque and power characteristics to match the driver’s acceleration or deceleration pattern. When the PCM does not get the expected input signal from the input/turbine speed sensor, it cannot make the proper predictions or matches to deliver a good shifting strategy.
What causes the P0717 code?
A few common causes can result in a P0717 code, including:
- A faulty valve body
- A faulty input/turbine speed sensor
- One or more faulty shift solenoids
- A shorted, open, or otherwise damaged circuit
- Contaminated transmission fluid
- A faulty engine coolant temperature sensor
What are the symptoms of the P0717 code?
When the P0717 code is stored, a number of symptoms will occur:
- The Check Engine light will turn on.
- The vehicle will not shift as expected and may have hard, sudden, or delayed shifts.
- The fuel efficiency will suffer.
- The engine will seem to misfire when coming to a stop after traveling at higher speeds.
- The engine will stall at idle.
In some rare cases, the only symptom will be the Check Engine light, but in most instances one or more of these symptoms will occur.
How does a mechanic diagnose the P0717 code?
A mechanic will first use an OBD-II scanner to identify the P0717 code and any codes related to it that may have been stored, as well. After that, they will start by checking technical service bulletins for the vehicle’s make and model to find out if there are any known issues that commonly cause this problem for your specific vehicle.
Then they will perform a visual inspection to ensure that all wiring is secure and undamaged, and that all connections are tight. They’ll also test the battery and battery cables, as well as the alternator, to ensure that none of these are the cause of the code. Then they’ll move on to further inspect all components associated with the input/turbine speed sensor, taking the time to retest the vehicle with each inspection or repair.
Common mistakes when diagnosing the P0717 code
Some of the symptoms involved with a P0717 code can be misleading and can result in a few different misdiagnoses. The most common of these include:
- Assuming there’s an internal transmission problem.
- Trying to resolve the engine misfiring problem without understanding what’s causing it.
- Replacing the speed sensor unnecessarily.
- Assuming the problem is a vehicle speed issue.
How serious is the P0717 code?
With so many symptoms affecting the drivability and performance of the vehicle, the P0717 code is absolutely a serious problem. It may not completely stop the vehicle from operating, but it can cause a number of dangerous situations, including stalling in traffic and/or unpredictable shifting.
What repairs can fix the P0717 code?
The right repair for the job will depend entirely on the underlying cause of the problem. Some of the most likely repairs to fix a P0717 code are:
- Replacing the valve body.
- Replacing the input/turbine speed sensor.
- Replacing one or more shift solenoids.
- Replacing or repairing damaged, shorted, or open wiring or circuits.
- Replacing the engine coolant temperature sensor
- Draining, flushing, and replacing the transmission fluid.
Additional comments for consideration regarding the P0717 code
It should be obvious from the symptoms associated with this code that it should be dealt with immediately. In addition to making it more difficult and dangerous to drive your car, this code will illuminate the Check Engine light and make it impossible to pass an OBD-II emissions test to renew your vehicle’s registration.
Need help with a P0717 code?
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