P0717 - Input/Turbine Speed Sensor A Circuit No Signal
The P0717 code indicates that the Powertrain Control Module (PCM) has detected no signal from the input/turbine speed sensor (also known as the transmission input speed sensor). This sensor monitors the rotational speed of the transmission's input shaft, which is critical for proper shift timing and torque converter lockup. Without this signal, the PCM cannot accurately control transmission operation, leading to harsh shifts, slipping, or limp mode.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping or delayed engagement
- Vehicle may enter limp mode (limited gear operation)
2. Most Common Causes
- Faulty input/turbine speed sensor
- Damaged or shorted wiring/connectors to the sensor
- Low transmission fluid level or contaminated fluid
- Internal transmission mechanical failure (e.g., damaged tone wheel)
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional transmission-related codes.
Step 2: Inspect transmission fluid level and condition; top off or replace if necessary.
Step 3: Visually check the input speed sensor wiring and connector for damage, corrosion, or loose connections.
Step 4: Test the sensor's resistance and voltage output with a multimeter; compare to manufacturer specifications.
Step 5: If sensor and wiring are okay, inspect the tone wheel or reluctor ring for damage (may require transmission disassembly).
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with P0717 can cause harsh shifting, transmission slipping, or sudden loss of drive, potentially leading to further transmission damage or unsafe driving conditions.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a sensor replacement if DIY, or $150 to $400 at a shop including labor. Additional costs may apply if wiring repairs or internal transmission work is needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.