The P0717 trouble code, defined as “Input/Turbine Speed Sensor ‘A’ Circuit No Signal,” indicates that the powertrain control module (PCM) has detected a failure in the input speed sensor circuit. This sensor plays a critical role in monitoring the transmission input speed, which is essential for proper vehicle operation. When the PCM does not receive a signal from this sensor, it can lead to various transmission issues, including erratic shifting and decreased fuel efficiency. Understanding this code is vital for vehicle owners and DIY mechanics aiming to diagnose and repair transmission-related problems effectively.
| P0717 Code Meaning | P0717 Code Common Causes |
|---|---|
| Input/Turbine Speed Sensor “A” Circuit No Signal | Malfunctioning input speed sensor |
| Loss of voltage output from the sensor circuit | Damaged wiring or connectors in the circuit |
| Transmission control module (TCM) malfunction | Faulty powertrain control module (PCM) |
| Improperly installed or defective sensor | Dirty or low transmission fluid affecting sensor performance |
Symptoms of P0717 Code
When the P0717 code is triggered, several symptoms may manifest, indicating an underlying issue with the transmission system:
- Illuminated Check Engine Light: The most common symptom is the check engine light turning on.
- Shifting Problems: Drivers may experience harsh or erratic shifting, or the transmission may fail to shift altogether.
- Erratic Speedometer Readings: The speedometer may display incorrect speeds or become inoperative.
- Decreased Fuel Efficiency: A malfunctioning transmission can lead to poor fuel economy.
- Transmission Slipping: The vehicle may slip out of gear unexpectedly, causing safety concerns.
Technical Explanation
The input/turbine speed sensor is typically a three-wire electromagnetic device located near the transmission input shaft. It measures the revolutions per minute (RPM) of the input shaft and sends this information to the PCM. The PCM uses this data to manage shifting points and ensure optimal performance of the transmission.
If there is no signal from this sensor, it can result from several factors:
- A faulty input speed sensor that fails to generate a signal.
- Damaged wiring or connectors that disrupt the electrical flow.
- A malfunctioning TCM or PCM that fails to interpret signals correctly.
- Low or dirty transmission fluid that affects sensor operation.
Step-by-Step Diagnosis of P0717 Code
Diagnosing a P0717 code requires a systematic approach to identify and resolve the underlying issues. Here are the steps to follow:
Step 1: Retrieve the Code
- Use an OBD-II Scanner: Connect an OBD-II scanner to your vehicle’s diagnostic port.
- Confirm the P0717 Code: Ensure that P0717 is indeed logged along with any related codes that may provide additional context.
Step 2: Visual Inspection
- Check Wiring and Connectors: Inspect all wiring and connectors associated with the input speed sensor for damage, corrosion, or loose connections.
- Look for Physical Damage: Examine the sensor itself for signs of wear or damage.
Step 3: Test the Input Speed Sensor
- Multimeter Testing: Use a multimeter to measure voltage and resistance at the sensor terminals.
- Compare Readings: Check these readings against specifications in your vehicle’s service manual.
Step 4: Inspect Transmission Fluid
- Check Fluid Level: Ensure that the transmission fluid is at the correct level.
- Inspect Fluid Condition: If fluid appears dirty or contaminated, consider performing a fluid change.
Step 5: Check TCM and PCM Functionality
- Inspect Control Modules: If previous steps do not reveal issues, check for faults in the TCM or PCM.
- Consult Technical Service Bulletins (TSBs): Look for manufacturer-specific TSBs that might address known problems related to P0717.
Solution Methods
Once diagnosed, addressing a P0717 code typically involves one or more of the following methods:
Replace Faulty Components
- Input Speed Sensor Replacement: If testing confirms that the input speed sensor is faulty, replace it with an OEM part for best results.
- Repair Damaged Wiring: Fix any damaged wiring or connectors found during inspection.
Fluid Maintenance
- Transmission Fluid Change: If fluid quality is poor, perform a complete fluid change using manufacturer-recommended fluids.
Control Module Repair/Replacement
- PCM/TCM Replacement: If diagnostics indicate a failure in either control module, consider professional replacement and reprogramming as necessary.
Cost Estimates
The cost of repairs related to P0717 can vary significantly based on labor rates, parts prices, and specific vehicle make and model:
- Input Speed Sensor Replacement: $100 – $300 (parts + labor)
- Wiring Repairs: $50 – $200 depending on extent of damage.
- Transmission Fluid Change: $100 – $250 based on fluid type and service provider.
- Control Module Replacement: $500 – $1500 including parts and programming fees.
Warnings and Recommendations
- Always consult your vehicle’s service manual for specific diagnostic procedures related to your make and model.
- If you are unsure about any step in this process, seek help from a qualified mechanic to avoid further damage to your vehicle’s transmission system.
- Regular maintenance of your vehicle’s transmission fluid can help prevent issues like those associated with the P0717 code.
Closing Paragraph
The P0717 code indicates significant issues within your vehicle’s transmission system that require prompt attention. By following this guide, DIY mechanics can diagnose and address these problems effectively while ensuring their vehicles remain safe and reliable on the road. Regular maintenance practices will also help mitigate future occurrences of this trouble code, enhancing overall vehicle performance and longevity.
Frequently Asked Questions About P0717
- What does P0717 mean?
P0717 indicates that there is no signal from the input/turbine speed sensor ‘A’, which is crucial for proper transmission function. - What are common symptoms of P0717?
Common symptoms include an illuminated check engine light, shifting problems, erratic speedometer readings, decreased fuel efficiency, and potential transmission slipping. - How do I diagnose a P0717 code?
Diagnosing involves using an OBD-II scanner to retrieve codes, visually inspecting wiring and connectors, testing the input speed sensor with a multimeter, checking transmission fluid levels and condition, and assessing TCM/PCM functionality. - Can I drive my car with a P0717 code?
It is not advisable as it can lead to serious transmission issues; it’s best to address it promptly. - What could cause a P0717 code?
Causes include a malfunctioning input speed sensor, damaged wiring or connectors, PCM/TCM issues, or low/dirty transmission fluid. - How much does it cost to fix a P0717 code?
The repair costs can range from $100 for minor repairs up to $1500 for control module replacements. - Is it safe to replace an input speed sensor myself?
If you have mechanical experience and proper tools, you can replace it; otherwise, consult a professional mechanic. - When should I seek professional help for code P0717?
If diagnostics reveal complex issues beyond basic repairs or if you’re unsure about any step in troubleshooting.