Fix P0717: Mechanic’s solutions that WORKED

The code P0717: Input/Turbine Speed Sensor Circuit No Signal points out an issue with the signal from the Input/Turbine Speed Sensor, which is critical for the vehicle’s transmission to operate correctly. This sensor helps the car’s computer understand how fast the engine is running, which in turn helps it decide when to shift gears.

P0717 quick overview

Meaning	P0717: Input/Turbine Speed Sensor Circuit No Signal
Is it serious?	This code is serious as it can lead to transmission issues, including erratic shifting or the vehicle not knowing the correct gear to be in.
Possible causes	– Faulty or damaged turbine speed sensor – Wiring issues, such as shorts or open circuits – Contaminated or low transmission fluid – Faulty transmission control module
How to diagnose?	Check Transmission Fluid: Ensure it’s at the correct level and not contaminated. Inspect Sensor and Wiring: Look for visible damage or loose connections at the turbine speed sensor. Test Sensor Signal: Use a lab scope to verify the sensor’s signal. Check Continuity: Ensure the wiring from the sensor to the TCM has proper continuity. Replace Sensor: If diagnostics point to a faulty sensor, replace it with an OEM part. Reflash/Reprogram TCM: If a new sensor doesn’t solve the issue, consider checking if the TCM needs an update or reprogramming.

How to fix P0717 – learn from mechanics

I looked into P0717 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.

Case #1: Kia

Vehicle Information:
2004 Kia Rio 1.6L

Issue + Repair History:

• The overdrive cancel button stops working after the car upshifts, and the car won’t go into overdrive without slipping.
• Previously replaced the turbine shaft speed sensor due to a P0717 code.

Other OBD2 Codes + Test Results:

• P0700, P0717: Keeps resetting

Suggestions to Fix Issue:

• Check TPS adjustment and Transaxle range selector switch.
• Verify linear solenoid valve line pressures.
• Perform a relearn procedure for the transaxle if the input speed sensor corrected the code.
• Refer to kiatechinfo.com for TSBs and follow the manual for diagnostics.
• Verify if the vehicle is in limp mode and whether the turbine sensor code returns after replacement.
• Compare the scan and test drive data input with RPM and turbine same as speedo or output sensor.

Final Fix:

• Located a broken wire at the 12-pin connector, specifically the wire to the #2 pin in the TSS connector, which was causing the issue.
• The 12-pin connector was found on the left side of the engine compartment, almost under the battery tray, contrary to initial expectations. Repairing this wire resolved the overdrive issue.

Case #2: Audi

Vehicle Information:
1998 Audi A6 2.8L

Issue + Repair History:

• The car displayed code VAG17101 / PO717 for Input Turbine/Speed Sensor Circuit.
• After repairing a fried “E” clutch and other transmission components, the issue of no signal from “G-182” on acceleration persisted, along with the same fault code.
• The car had been used repeatedly in limp mode by the owner and likely jump-started numerous times, leading to a battery replacement.

Other OBD2 Codes + Test Results:

• Code P0717: Input Turbine/Speed Sensor Circuit always occurs.

Suggestions to Fix Issue:

• Consider the possibility of an issue with the valve body or the transmission control module (TCM), as indicated by similar problems with different vehicles, where the TCM failed to compare speed signals correctly.

Final Fix:

• The car was returned to the customer without further testing or repairs due to financial constraints. It was suggested that the entire transmission might need replacement to avoid further hassle.

Case #3: Oldsmobile

Vehicle Information:
1996 Oldsmobile Aurora 4.0L

Issue + Repair History:

• “Traction off” light intermittently comes on but resets with key cycle.
• Previously had code P0717 with slipping 1-2 shift leading to a rebuilt transmission due to planetary failure.
• Currently showing code P0603 indicating intermittent Keep Alive Memory (KAM) loss.

Other OBD2 Codes + Test Results:

• P0717: Input/Turbine Speed Sensor Circuit No Signal
• P0603: Internal Control Module Keep Alive Memory (KAM) Error

Suggestions to Fix Issue:

• Check the connectors on the ABS Module for any broken pieces, particularly the little tower piece.
• Inspect all vehicle speed sensors for erratic behavior and ensure connections are secure.
• Wiggle test wiring, particularly around the wheel speed sensors, to check for any hidden breaks or shorts.

Final Fix:

• After checking the vehicle speed sensors and ABS module connector, a fault was found in the Pressure Modulator Valve (PVM) which was followed by a fault in the Electronic Brake Traction Control Module (EBTCM).
• A solenoid in the PVM was found to be shorting out.
• Replaced the PVM with a new one, ensured all connectors were secure and clean, resolving the issue.

Case #4: Volvo

Vehicle Information:
1999 Volvo S80 2.9 2.9L

Issue + Repair History:

• Check engine light was on with a P0717 code indicating a turbine speed sensor problem.
• The vehicle had a transmission installed 6 months prior.
• After testing, the signal was perfect until the circuit was completed (connecting the computer).
• Replaced the transmission controller and had it flashed by Volvo, but the issue persisted.
• Replaced the transmission input sensor with no change.

Other OBD2 Codes + Test Results:

• P0717 – Turbine Speed Sensor Circuit No Signal

Suggestions to Fix Issue:

• Check for high resistance between the sensor and the ECM, and consider using jumper wires to bypass the original wiring for testing.
• Ensure you are using the correct sensor for the vehicle, particularly a Volvo sensor rather than an aftermarket one.

Final Fix:

• Replaced the aftermarket transmission input sensor with a Volvo-specific sensor, which resolved the issue.

Case #5: Nissan

Vehicle Information:
2007 Nissan Frontier SE 4.0L

Issue + Repair History:

• The vehicle had erratic shifting from first to second gear and was hunting for gears while driving.
• A diagnostic code P0717 (Input Turbine Speed Sensor Circuit) was set.
• The customer uses the vehicle regularly and couldn’t leave it for extended diagnosis.

Other OBD2 Codes + Test Results:

• P0717 – Input Turbine Speed Sensor Circuit No Signal

Suggestions to Fix Issue:

• Check the transmission fluid for contamination (such as a ‘strawberry milkshake’ appearance) which could indicate a radiator problem introducing coolant into the transmission.
• Consider the possibility of an extended factory warranty covering the transmission issue.
• Check for glycol in the transmission fluid using test strips as radiator issues are common.
• Replace the input speed sensor located near the top of the transmission towards the front.

Final Fix:

• Replaced the defective input speed sensor assembly, which required removing the pan and rear tailshaft to access it inside the rear of the transmission case.

Advice	Brief Description of Diagnostic Step
Check Wiring and Connections	Inspect the wiring and connectors leading to the turbine speed sensor for any damage or loose connections.
Inspect Transmission Fluid	Check the transmission fluid for signs of contamination, such as a milky appearance which may indicate coolant intrusion.
Test Sensor Signal	Use a lab scope to check the signal from the turbine speed sensor, ensuring it changes appropriately with engine RPM.
Replace Turbine Speed Sensor	If diagnostics indicate, replace the turbine speed sensor with an OEM part to ensure compatibility and proper function.
Check for Glycol	Use test strips to check for glycol in the transmission fluid, which can indicate a failing radiator causing coolant to mix with transmission fluid.
Consider Radiator Issues	Be aware of common issues with the radiator causing coolant to leak into the transmission, especially in specific models.
Verify with Factory Specifications	Confirm the operation and signal of the turbine speed sensor against factory specifications to rule out other issues.
Reprogram/Flash PCM if Needed	If a new sensor or related part is installed, ensure the PCM is properly reprogrammed or flashed to recognize the new components.